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282 vulnerabilities found for mybb by mybb
CVE-2026-58054 (GCVE-0-2026-58054)
Vulnerability from nvd – Published: 2026-06-28 01:32 – Updated: 2026-06-29 13:03
VLAI
Title
MyBB - Privilege Escalation from Limited ACP User Management to Administrator
Summary
MyBB 1.8.40 does not restrict which usergroup a limited Admin Control Panel user may assign when creating or editing users; the user module offers the Administrators group (gid 4) and its datahandler's verify_usergroup() unconditionally returns true. An admin holding only the delegated user-management permission can assign the Administrators group to an account and escalate to the full Administrator permission set.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
- CWE-269 - Improper Privilege Management
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/bikini/exploitarium/tree/main/… | exploitthird-party-advisory |
| https://www.vulncheck.com/advisories/mybb-privile… | third-party-advisory |
Date Public
2026-06-23 00:00
Credits
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CVE-2023-53979 (GCVE-0-2023-53979)
Vulnerability from nvd – Published: 2025-12-22 21:35 – Updated: 2026-03-05 12:03
VLAI
Title
MyBB 1.8.32 Authenticated Remote Code Execution via Chained Vulnerabilities
Summary
MyBB 1.8.32 contains a chained vulnerability that allows authenticated administrators to bypass avatar upload restrictions and execute arbitrary code. Attackers can modify upload path settings, upload a malicious PHP-embedded image file, and execute commands through the language configuration editing interface.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
- CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
Assigner
References
5 references
| URL | Tags |
|---|---|
| https://www.exploit-db.com/exploits/51213 | exploit |
| https://mybb.com/ | product |
| https://fdlucifer.github.io/2023/01/17/mybb1-8-32… | technical-description |
| https://www.vulncheck.com/advisories/mybb-authent… | third-party-advisory |
| https://www.cve.org/CVERecord?id=CVE-2022-45867 |
Date Public
2023-01-19 00:00
Credits
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CVE-2023-53978 (GCVE-0-2023-53978)
Vulnerability from nvd – Published: 2025-12-22 21:35 – Updated: 2026-04-07 14:08
VLAI
Title
myBB Forums 1.8.26 Stored Cross-Site Scripting via Forum Announcements
Summary
myBB Forums 1.8.26 contains a stored cross-site scripting vulnerability in the forum announcement system that allows authenticated administrators to inject malicious scripts when creating announcements. Attackers can exploit this vulnerability by inserting script payloads in the announcement title field when adding announcements through the 'Forums and Posts' > 'Forum Announcements' interface, causing arbitrary JavaScript to execute when the announcement is displayed on the forum.
Severity
5.4 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://www.exploit-db.com/exploits/51136 | exploit |
| https://mybb.com/ | product |
| https://www.vulncheck.com/advisories/mybb-forums-… | third-party-advisory |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Mybb | myBB forums |
Affected:
1.8.26
|
Date Public
2023-03-30 00:00
Credits
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CVE-2023-53977 (GCVE-0-2023-53977)
Vulnerability from nvd – Published: 2025-12-22 21:35 – Updated: 2026-04-07 14:08
VLAI
Title
myBB Forums 1.8.26 Stored Cross-Site Scripting via Forum Management
Summary
myBB Forums 1.8.26 contains a stored cross-site scripting vulnerability in the forum management system that allows authenticated administrators to inject malicious scripts when creating new forums. Attackers can exploit this vulnerability by inserting script payloads in the forum title field when adding new forums through the 'Forums and Posts' > 'Forum Management' interface, causing arbitrary JavaScript to execute when the forum listing is viewed.
Severity
5.4 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://www.exploit-db.com/exploits/51136 | exploit |
| https://mybb.com/ | product |
| https://www.vulncheck.com/advisories/mybb-forums-… | third-party-advisory |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Mybb | myBB forums |
Affected:
1.8.26
|
Date Public
2023-03-30 00:00
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CVE-2023-53976 (GCVE-0-2023-53976)
Vulnerability from nvd – Published: 2025-12-22 21:35 – Updated: 2026-04-07 14:08
VLAI
Title
myBB Forums 1.8.26 Stored Cross-Site Scripting via Template Management
Summary
myBB Forums 1.8.26 contains a stored cross-site scripting vulnerability in the template management system that allows authenticated administrators to inject malicious scripts when creating new templates. Attackers can exploit this vulnerability by inserting script payloads in the template title field when adding new templates through the 'Templates and Style' > 'Templates' > 'Manage Templates' > 'Global Templates' interface, causing arbitrary JavaScript to execute when the template is viewed.
Severity
5.4 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://www.exploit-db.com/exploits/51136 | exploit |
| https://mybb.com/ | product |
| https://www.vulncheck.com/advisories/mybb-forums-… | third-party-advisory |
| https://www.cve.org/CVERecord?id=CVE-2021-41866 |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Mybb | myBB forums |
Affected:
1.8.26
|
Date Public
2023-03-30 00:00
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CVE-2011-10018 (GCVE-0-2011-10018)
Vulnerability from nvd – Published: 2025-08-13 20:35 – Updated: 2026-04-07 14:02
VLAI
Title
myBB 1.6.4 Backdoor Arbitrary Command Execution
Summary
myBB version 1.6.4 was distributed with an unauthorized backdoor embedded in the source code. The backdoor allowed remote attackers to execute arbitrary PHP code by injecting payloads into a specially crafted collapsed cookie. This vulnerability was introduced during packaging and was not part of the intended application logic. Exploitation requires no authentication and results in full compromise of the web server under the context of the web application.
Severity
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
Assigner
References
5 references
| URL | Tags |
|---|---|
| https://raw.githubusercontent.com/rapid7/metasplo… | exploit |
| https://www.exploit-db.com/exploits/17949 | exploit |
| https://web.archive.org/web/20111015224948/http:/… | third-party-advisory |
| https://blog.mybb.com/2011/10/06/1-6-4-security-v… | vendor-advisorypatch |
| https://www.vulncheck.com/advisories/mybb-backdoo… | third-party-advisory |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| myBB Group | Forum Software |
Affected:
1.6.4
|
Date Public
2011-10-09 00:00
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CVE-2025-48941 (GCVE-0-2025-48941)
Vulnerability from nvd – Published: 2025-06-02 15:58 – Updated: 2025-06-02 16:07
VLAI
Title
MyBB may disclosure unviewable threads' titles in searches
Summary
MyBB is free and open source forum software. Prior to version 1.8.39, the search component does not validate permissions correctly, which allows attackers to determine the existence of hidden (draft, unapproved, or soft-deleted) threads containing specified text in the title. The visibility state (`mybb_threads.visible` integer column) of threads is not validated in internal search queries, whose result is used to output a general success or failure of the search. While MyBB validates permissions when displaying the final search results, a search operation that internally produces at least one result outputs a redirect response (as a HTTP redirect, or a success message page with delayed redirect, depending on configuration). On the other hand, a search operation that internally produces no results outputs a corresponding message in the response without a redirect. This allows a user to determine whether threads matching title search parameters exist, including draft threads (`visible` with a value of `-2`), soft-deleted threads (`visible` with a value of `-1`), and unapproved threads (`visible` with a value of `0`); in addition to displaying generally visible threads (`visible` with a value of `1`). This vulnerability does not affect other layers of permissions. In order to exploit the vulnerability, the user must have access to the search functionality, and general access to forums containing the thread(s). The vulnerability does not expose the message content of posts. MyBB 1.8.39 resolves this issue.
Severity
5.3 (Medium)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-1230 - Exposure of Sensitive Information Through Metadata
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://github.com/mybb/mybb/security/advisories/… | x_refsource_CONFIRM |
| https://github.com/mybb/mybb/commit/b8cc332a27e14… | x_refsource_MISC |
| https://mybb.com/versions/1.8.39 | x_refsource_MISC |
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CVE-2025-48940 (GCVE-0-2025-48940)
Vulnerability from nvd – Published: 2025-06-02 15:52 – Updated: 2025-06-02 16:06
VLAI
Title
MyBB's upgrade component vulnerable to local file inclusion
Summary
MyBB is free and open source forum software. Prior to version 1.8.39, the upgrade component does not validate user input properly, which allows attackers to perform local file inclusion (LFI) via a specially crafted parameter value. In order to exploit the vulnerability, the installer must be unlocked (no `install/lock` file present) and the upgrade script must be accessible (by re-installing the forum via access to `install/index.php`; when the forum has not yet been installed; or the attacker is authenticated as a forum administrator). MyBB 1.8.39 resolves this issue.
Severity
7.2 (High)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://github.com/mybb/mybb/security/advisories/… | x_refsource_CONFIRM |
| https://github.com/mybb/mybb/commit/6e6cfbd524d91… | x_refsource_MISC |
| https://mybb.com/versions/1.8.39 | x_refsource_MISC |
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CVE-2025-29460 (GCVE-0-2025-29460)
Vulnerability from nvd – Published: 2025-04-17 00:00 – Updated: 2025-04-23 13:04 Disputed
VLAI
Summary
An issue in MyBB 1.8.38 allows a remote attacker to obtain sensitive information via the Add Mycode function. NOTE: the Supplier disputes this because of the allowed actions of Board administrators and because of SSRF mitigation.
Severity
7.6 (High)
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- n/a
- CWE-918 - Server-Side Request Forgery (SSRF)
Assigner
References
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CVE-2025-29459 (GCVE-0-2025-29459)
Vulnerability from nvd – Published: 2025-04-17 00:00 – Updated: 2025-04-23 13:02 Disputed
VLAI
Summary
An issue in MyBB 1.8.38 allows a remote attacker to obtain sensitive information via the Mail function. NOTE: the Supplier disputes this because of the allowed actions of Board administrators and because of SSRF mitigation.
Severity
7.6 (High)
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- n/a
- CWE-918 - Server-Side Request Forgery (SSRF)
Assigner
References
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CVE-2025-29458 (GCVE-0-2025-29458)
Vulnerability from nvd – Published: 2025-04-17 00:00 – Updated: 2025-04-23 13:01 Disputed
VLAI
Summary
An issue in MyBB 1.8.38 allows a remote attacker to obtain sensitive information via the Change Avatar function. NOTE: the Supplier disputes this because of the allowed actions of Board administrators and because of SSRF mitigation.
Severity
7.6 (High)
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- n/a
- CWE-918 - Server-Side Request Forgery (SSRF)
Assigner
References
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CVE-2025-29457 (GCVE-0-2025-29457)
Vulnerability from nvd – Published: 2025-04-17 00:00 – Updated: 2025-04-23 12:59 Disputed
VLAI
Summary
An issue in MyBB 1.8.38 allows a remote attacker to obtain sensitive information via the Import a Theme function. NOTE: the Supplier disputes this because of the allowed actions of Board administrators and because of SSRF mitigation.
Severity
7.6 (High)
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- n/a
- CWE-918 - Server-Side Request Forgery (SSRF)
Assigner
References
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CVE-2024-52702 (GCVE-0-2024-52702)
Vulnerability from nvd – Published: 2024-11-20 00:00 – Updated: 2025-12-08 16:03 Disputed
VLAI
Summary
A stored cross-site scripting (XSS) vulnerability in the component install\index.php of MyBB v1.8.38 allows attackers to execute arbitrary web scripts or HTML via a crafted payload injected into the Website Name parameter. NOTE: this is disputed by the Supplier because Website Name can only be set by an administrator, who may use JavaScript if they wish.
Severity
6.1 (Medium)
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- n/a
- CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Assigner
References
2 references
Impacted products
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CVE-2024-23336 (GCVE-0-2024-23336)
Vulnerability from nvd – Published: 2024-05-01 06:27 – Updated: 2024-08-01 22:59
VLAI
Title
Incomplete disallowed remote addresses list in MyBB
Summary
MyBB is a free and open source forum software. The default list of disallowed remote hosts does not contain the `127.0.0.0/8` block, which may result in a Server-Side Request Forgery (SSRF) vulnerability. The Configuration File's _Disallowed Remote Addresses_ list (`$config['disallowed_remote_addresses']`) contains the address `127.0.0.1`, but does not include the complete block `127.0.0.0/8`. MyBB 1.8.38 resolves this issue in default installations. Administrators of installed boards should update the existing configuration (`inc/config.php`) to include all addresses blocked by default. Additionally, users are advised to verify that it includes any other IPv4 addresses resolving to the server and other internal resources. Users unable to upgrade may manually add 127.0.0.0/8' to their disallowed address list.
Severity
5 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://github.com/mybb/mybb/security/advisories/… | x_refsource_CONFIRM |
| https://github.com/mybb/mybb/commit/d6a96019025de… | x_refsource_MISC |
| https://docs.mybb.com/1.8/administration/configur… | x_refsource_MISC |
| https://mybb.com/versions/1.8.38 | x_refsource_MISC |
Impacted products
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CVE-2024-23335 (GCVE-0-2024-23335)
Vulnerability from nvd – Published: 2024-05-01 06:27 – Updated: 2024-08-01 22:59
VLAI
Title
Backups directory .htaccess deletion in. MyBB
Summary
MyBB is a free and open source forum software. The backup management module of the Admin CP may accept `.htaccess` as the name of the backup file to be deleted, which may expose the stored backup files over HTTP on Apache servers. MyBB 1.8.38 resolves this issue. Users are advised to upgrade. There are no known workarounds for this vulnerability
Severity
4.7 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-20 - Improper Input Validation
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://github.com/mybb/mybb/security/advisories/… | x_refsource_CONFIRM |
| https://github.com/mybb/mybb/commit/450259e501b94… | x_refsource_MISC |
| https://mybb.com/versions/1.8.38 | x_refsource_MISC |
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CVE-2026-58054 (GCVE-0-2026-58054)
Vulnerability from cvelistv5 – Published: 2026-06-28 01:32 – Updated: 2026-06-29 13:03
VLAI
Title
MyBB - Privilege Escalation from Limited ACP User Management to Administrator
Summary
MyBB 1.8.40 does not restrict which usergroup a limited Admin Control Panel user may assign when creating or editing users; the user module offers the Administrators group (gid 4) and its datahandler's verify_usergroup() unconditionally returns true. An admin holding only the delegated user-management permission can assign the Administrators group to an account and escalate to the full Administrator permission set.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
- CWE-269 - Improper Privilege Management
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/bikini/exploitarium/tree/main/… | exploitthird-party-advisory |
| https://www.vulncheck.com/advisories/mybb-privile… | third-party-advisory |
Date Public
2026-06-23 00:00
Credits
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CVE-2023-53979 (GCVE-0-2023-53979)
Vulnerability from cvelistv5 – Published: 2025-12-22 21:35 – Updated: 2026-03-05 12:03
VLAI
Title
MyBB 1.8.32 Authenticated Remote Code Execution via Chained Vulnerabilities
Summary
MyBB 1.8.32 contains a chained vulnerability that allows authenticated administrators to bypass avatar upload restrictions and execute arbitrary code. Attackers can modify upload path settings, upload a malicious PHP-embedded image file, and execute commands through the language configuration editing interface.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
- CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
Assigner
References
5 references
| URL | Tags |
|---|---|
| https://www.exploit-db.com/exploits/51213 | exploit |
| https://mybb.com/ | product |
| https://fdlucifer.github.io/2023/01/17/mybb1-8-32… | technical-description |
| https://www.vulncheck.com/advisories/mybb-authent… | third-party-advisory |
| https://www.cve.org/CVERecord?id=CVE-2022-45867 |
Date Public
2023-01-19 00:00
Credits
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CVE-2023-53978 (GCVE-0-2023-53978)
Vulnerability from cvelistv5 – Published: 2025-12-22 21:35 – Updated: 2026-04-07 14:08
VLAI
Title
myBB Forums 1.8.26 Stored Cross-Site Scripting via Forum Announcements
Summary
myBB Forums 1.8.26 contains a stored cross-site scripting vulnerability in the forum announcement system that allows authenticated administrators to inject malicious scripts when creating announcements. Attackers can exploit this vulnerability by inserting script payloads in the announcement title field when adding announcements through the 'Forums and Posts' > 'Forum Announcements' interface, causing arbitrary JavaScript to execute when the announcement is displayed on the forum.
Severity
5.4 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://www.exploit-db.com/exploits/51136 | exploit |
| https://mybb.com/ | product |
| https://www.vulncheck.com/advisories/mybb-forums-… | third-party-advisory |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Mybb | myBB forums |
Affected:
1.8.26
|
Date Public
2023-03-30 00:00
Credits
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CVE-2023-53977 (GCVE-0-2023-53977)
Vulnerability from cvelistv5 – Published: 2025-12-22 21:35 – Updated: 2026-04-07 14:08
VLAI
Title
myBB Forums 1.8.26 Stored Cross-Site Scripting via Forum Management
Summary
myBB Forums 1.8.26 contains a stored cross-site scripting vulnerability in the forum management system that allows authenticated administrators to inject malicious scripts when creating new forums. Attackers can exploit this vulnerability by inserting script payloads in the forum title field when adding new forums through the 'Forums and Posts' > 'Forum Management' interface, causing arbitrary JavaScript to execute when the forum listing is viewed.
Severity
5.4 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://www.exploit-db.com/exploits/51136 | exploit |
| https://mybb.com/ | product |
| https://www.vulncheck.com/advisories/mybb-forums-… | third-party-advisory |
Impacted products
1 product
| Vendor | Product | Version | |
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| Mybb | myBB forums |
Affected:
1.8.26
|
Date Public
2023-03-30 00:00
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CVE-2023-53976 (GCVE-0-2023-53976)
Vulnerability from cvelistv5 – Published: 2025-12-22 21:35 – Updated: 2026-04-07 14:08
VLAI
Title
myBB Forums 1.8.26 Stored Cross-Site Scripting via Template Management
Summary
myBB Forums 1.8.26 contains a stored cross-site scripting vulnerability in the template management system that allows authenticated administrators to inject malicious scripts when creating new templates. Attackers can exploit this vulnerability by inserting script payloads in the template title field when adding new templates through the 'Templates and Style' > 'Templates' > 'Manage Templates' > 'Global Templates' interface, causing arbitrary JavaScript to execute when the template is viewed.
Severity
5.4 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://www.exploit-db.com/exploits/51136 | exploit |
| https://mybb.com/ | product |
| https://www.vulncheck.com/advisories/mybb-forums-… | third-party-advisory |
| https://www.cve.org/CVERecord?id=CVE-2021-41866 |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Mybb | myBB forums |
Affected:
1.8.26
|
Date Public
2023-03-30 00:00
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CVE-2011-10018 (GCVE-0-2011-10018)
Vulnerability from cvelistv5 – Published: 2025-08-13 20:35 – Updated: 2026-04-07 14:02
VLAI
Title
myBB 1.6.4 Backdoor Arbitrary Command Execution
Summary
myBB version 1.6.4 was distributed with an unauthorized backdoor embedded in the source code. The backdoor allowed remote attackers to execute arbitrary PHP code by injecting payloads into a specially crafted collapsed cookie. This vulnerability was introduced during packaging and was not part of the intended application logic. Exploitation requires no authentication and results in full compromise of the web server under the context of the web application.
Severity
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
Assigner
References
5 references
| URL | Tags |
|---|---|
| https://raw.githubusercontent.com/rapid7/metasplo… | exploit |
| https://www.exploit-db.com/exploits/17949 | exploit |
| https://web.archive.org/web/20111015224948/http:/… | third-party-advisory |
| https://blog.mybb.com/2011/10/06/1-6-4-security-v… | vendor-advisorypatch |
| https://www.vulncheck.com/advisories/mybb-backdoo… | third-party-advisory |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| myBB Group | Forum Software |
Affected:
1.6.4
|
Date Public
2011-10-09 00:00
Credits
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CVE-2025-48941 (GCVE-0-2025-48941)
Vulnerability from cvelistv5 – Published: 2025-06-02 15:58 – Updated: 2025-06-02 16:07
VLAI
Title
MyBB may disclosure unviewable threads' titles in searches
Summary
MyBB is free and open source forum software. Prior to version 1.8.39, the search component does not validate permissions correctly, which allows attackers to determine the existence of hidden (draft, unapproved, or soft-deleted) threads containing specified text in the title. The visibility state (`mybb_threads.visible` integer column) of threads is not validated in internal search queries, whose result is used to output a general success or failure of the search. While MyBB validates permissions when displaying the final search results, a search operation that internally produces at least one result outputs a redirect response (as a HTTP redirect, or a success message page with delayed redirect, depending on configuration). On the other hand, a search operation that internally produces no results outputs a corresponding message in the response without a redirect. This allows a user to determine whether threads matching title search parameters exist, including draft threads (`visible` with a value of `-2`), soft-deleted threads (`visible` with a value of `-1`), and unapproved threads (`visible` with a value of `0`); in addition to displaying generally visible threads (`visible` with a value of `1`). This vulnerability does not affect other layers of permissions. In order to exploit the vulnerability, the user must have access to the search functionality, and general access to forums containing the thread(s). The vulnerability does not expose the message content of posts. MyBB 1.8.39 resolves this issue.
Severity
5.3 (Medium)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-1230 - Exposure of Sensitive Information Through Metadata
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://github.com/mybb/mybb/security/advisories/… | x_refsource_CONFIRM |
| https://github.com/mybb/mybb/commit/b8cc332a27e14… | x_refsource_MISC |
| https://mybb.com/versions/1.8.39 | x_refsource_MISC |
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CVE-2025-48940 (GCVE-0-2025-48940)
Vulnerability from cvelistv5 – Published: 2025-06-02 15:52 – Updated: 2025-06-02 16:06
VLAI
Title
MyBB's upgrade component vulnerable to local file inclusion
Summary
MyBB is free and open source forum software. Prior to version 1.8.39, the upgrade component does not validate user input properly, which allows attackers to perform local file inclusion (LFI) via a specially crafted parameter value. In order to exploit the vulnerability, the installer must be unlocked (no `install/lock` file present) and the upgrade script must be accessible (by re-installing the forum via access to `install/index.php`; when the forum has not yet been installed; or the attacker is authenticated as a forum administrator). MyBB 1.8.39 resolves this issue.
Severity
7.2 (High)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
Assigner
References
3 references
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|---|---|
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| https://github.com/mybb/mybb/commit/6e6cfbd524d91… | x_refsource_MISC |
| https://mybb.com/versions/1.8.39 | x_refsource_MISC |
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CVE-2025-29457 (GCVE-0-2025-29457)
Vulnerability from cvelistv5 – Published: 2025-04-17 00:00 – Updated: 2025-04-23 12:59 Disputed
VLAI
Summary
An issue in MyBB 1.8.38 allows a remote attacker to obtain sensitive information via the Import a Theme function. NOTE: the Supplier disputes this because of the allowed actions of Board administrators and because of SSRF mitigation.
Severity
7.6 (High)
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- n/a
- CWE-918 - Server-Side Request Forgery (SSRF)
Assigner
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CVE-2025-29460 (GCVE-0-2025-29460)
Vulnerability from cvelistv5 – Published: 2025-04-17 00:00 – Updated: 2025-04-23 13:04 Disputed
VLAI
Summary
An issue in MyBB 1.8.38 allows a remote attacker to obtain sensitive information via the Add Mycode function. NOTE: the Supplier disputes this because of the allowed actions of Board administrators and because of SSRF mitigation.
Severity
7.6 (High)
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- n/a
- CWE-918 - Server-Side Request Forgery (SSRF)
Assigner
References
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CVE-2025-29458 (GCVE-0-2025-29458)
Vulnerability from cvelistv5 – Published: 2025-04-17 00:00 – Updated: 2025-04-23 13:01 Disputed
VLAI
Summary
An issue in MyBB 1.8.38 allows a remote attacker to obtain sensitive information via the Change Avatar function. NOTE: the Supplier disputes this because of the allowed actions of Board administrators and because of SSRF mitigation.
Severity
7.6 (High)
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- n/a
- CWE-918 - Server-Side Request Forgery (SSRF)
Assigner
References
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CVE-2025-29459 (GCVE-0-2025-29459)
Vulnerability from cvelistv5 – Published: 2025-04-17 00:00 – Updated: 2025-04-23 13:02 Disputed
VLAI
Summary
An issue in MyBB 1.8.38 allows a remote attacker to obtain sensitive information via the Mail function. NOTE: the Supplier disputes this because of the allowed actions of Board administrators and because of SSRF mitigation.
Severity
7.6 (High)
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- n/a
- CWE-918 - Server-Side Request Forgery (SSRF)
Assigner
References
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CVE-2024-52702 (GCVE-0-2024-52702)
Vulnerability from cvelistv5 – Published: 2024-11-20 00:00 – Updated: 2025-12-08 16:03 Disputed
VLAI
Summary
A stored cross-site scripting (XSS) vulnerability in the component install\index.php of MyBB v1.8.38 allows attackers to execute arbitrary web scripts or HTML via a crafted payload injected into the Website Name parameter. NOTE: this is disputed by the Supplier because Website Name can only be set by an administrator, who may use JavaScript if they wish.
Severity
6.1 (Medium)
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- n/a
- CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Assigner
References
2 references
Impacted products
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CVE-2024-23335 (GCVE-0-2024-23335)
Vulnerability from cvelistv5 – Published: 2024-05-01 06:27 – Updated: 2024-08-01 22:59
VLAI
Title
Backups directory .htaccess deletion in. MyBB
Summary
MyBB is a free and open source forum software. The backup management module of the Admin CP may accept `.htaccess` as the name of the backup file to be deleted, which may expose the stored backup files over HTTP on Apache servers. MyBB 1.8.38 resolves this issue. Users are advised to upgrade. There are no known workarounds for this vulnerability
Severity
4.7 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-20 - Improper Input Validation
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://github.com/mybb/mybb/security/advisories/… | x_refsource_CONFIRM |
| https://github.com/mybb/mybb/commit/450259e501b94… | x_refsource_MISC |
| https://mybb.com/versions/1.8.38 | x_refsource_MISC |
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CVE-2024-23336 (GCVE-0-2024-23336)
Vulnerability from cvelistv5 – Published: 2024-05-01 06:27 – Updated: 2024-08-01 22:59
VLAI
Title
Incomplete disallowed remote addresses list in MyBB
Summary
MyBB is a free and open source forum software. The default list of disallowed remote hosts does not contain the `127.0.0.0/8` block, which may result in a Server-Side Request Forgery (SSRF) vulnerability. The Configuration File's _Disallowed Remote Addresses_ list (`$config['disallowed_remote_addresses']`) contains the address `127.0.0.1`, but does not include the complete block `127.0.0.0/8`. MyBB 1.8.38 resolves this issue in default installations. Administrators of installed boards should update the existing configuration (`inc/config.php`) to include all addresses blocked by default. Additionally, users are advised to verify that it includes any other IPv4 addresses resolving to the server and other internal resources. Users unable to upgrade may manually add 127.0.0.0/8' to their disallowed address list.
Severity
5 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://github.com/mybb/mybb/security/advisories/… | x_refsource_CONFIRM |
| https://github.com/mybb/mybb/commit/d6a96019025de… | x_refsource_MISC |
| https://docs.mybb.com/1.8/administration/configur… | x_refsource_MISC |
| https://mybb.com/versions/1.8.38 | x_refsource_MISC |
Impacted products
{
"containers": {
"adp": [
{
"affected": [
{
"cpes": [
"cpe:2.3:a:mybb:mybb:*:*:*:*:*:*:*:*"
],
"defaultStatus": "unknown",
"product": "mybb",
"vendor": "mybb",
"versions": [
{
"lessThan": "1.8.38",
"status": "affected",
"version": "0",
"versionType": "custom"
}
]
}
],
"metrics": [
{
"other": {
"content": {
"id": "CVE-2024-23336",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "no"
},
{
"Technical Impact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2024-05-01T13:48:54.371730Z",
"version": "2.0.3"
},
"type": "ssvc"
}
}
],
"providerMetadata": {
"dateUpdated": "2024-06-06T14:06:34.074Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
},
{
"providerMetadata": {
"dateUpdated": "2024-08-01T22:59:32.176Z",
"orgId": "af854a3a-2127-422b-91ae-364da2661108",
"shortName": "CVE"
},
"references": [
{
"name": "https://github.com/mybb/mybb/security/advisories/GHSA-qfrj-65mv-h75h",
"tags": [
"x_refsource_CONFIRM",
"x_transferred"
],
"url": "https://github.com/mybb/mybb/security/advisories/GHSA-qfrj-65mv-h75h"
},
{
"name": "https://github.com/mybb/mybb/commit/d6a96019025de9149014e06b1df252e6122e5630",
"tags": [
"x_refsource_MISC",
"x_transferred"
],
"url": "https://github.com/mybb/mybb/commit/d6a96019025de9149014e06b1df252e6122e5630"
},
{
"name": "https://docs.mybb.com/1.8/administration/configuration-file",
"tags": [
"x_refsource_MISC",
"x_transferred"
],
"url": "https://docs.mybb.com/1.8/administration/configuration-file"
},
{
"name": "https://mybb.com/versions/1.8.38",
"tags": [
"x_refsource_MISC",
"x_transferred"
],
"url": "https://mybb.com/versions/1.8.38"
}
],
"title": "CVE Program Container"
}
],
"cna": {
"affected": [
{
"product": "mybb",
"vendor": "mybb",
"versions": [
{
"status": "affected",
"version": "\u003c 1.8.38"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "MyBB is a free and open source forum software. The default list of disallowed remote hosts does not contain the `127.0.0.0/8` block, which may result in a Server-Side Request Forgery (SSRF) vulnerability. The Configuration File\u0027s _Disallowed Remote Addresses_ list (`$config[\u0027disallowed_remote_addresses\u0027]`) contains the address `127.0.0.1`, but does not include the complete block `127.0.0.0/8`. MyBB 1.8.38 resolves this issue in default installations. Administrators of installed boards should update the existing configuration (`inc/config.php`) to include all addresses blocked by default. Additionally, users are advised to verify that it includes any other IPv4 addresses resolving to the server and other internal resources. Users unable to upgrade may manually add 127.0.0.0/8\u0027 to their disallowed address list."
}
],
"metrics": [
{
"cvssV3_1": {
"attackComplexity": "HIGH",
"attackVector": "NETWORK",
"availabilityImpact": "LOW",
"baseScore": 5,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "LOW",
"integrityImpact": "LOW",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:L",
"version": "3.1"
}
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-918",
"description": "CWE-918: Server-Side Request Forgery (SSRF)",
"lang": "en",
"type": "CWE"
}
]
},
{
"descriptions": [
{
"cweId": "CWE-184",
"description": "CWE-184: Incomplete List of Disallowed Inputs",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2024-05-01T06:27:37.987Z",
"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"shortName": "GitHub_M"
},
"references": [
{
"name": "https://github.com/mybb/mybb/security/advisories/GHSA-qfrj-65mv-h75h",
"tags": [
"x_refsource_CONFIRM"
],
"url": "https://github.com/mybb/mybb/security/advisories/GHSA-qfrj-65mv-h75h"
},
{
"name": "https://github.com/mybb/mybb/commit/d6a96019025de9149014e06b1df252e6122e5630",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/mybb/mybb/commit/d6a96019025de9149014e06b1df252e6122e5630"
},
{
"name": "https://docs.mybb.com/1.8/administration/configuration-file",
"tags": [
"x_refsource_MISC"
],
"url": "https://docs.mybb.com/1.8/administration/configuration-file"
},
{
"name": "https://mybb.com/versions/1.8.38",
"tags": [
"x_refsource_MISC"
],
"url": "https://mybb.com/versions/1.8.38"
}
],
"source": {
"advisory": "GHSA-qfrj-65mv-h75h",
"discovery": "UNKNOWN"
},
"title": "Incomplete disallowed remote addresses list in MyBB"
}
},
"cveMetadata": {
"assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"assignerShortName": "GitHub_M",
"cveId": "CVE-2024-23336",
"datePublished": "2024-05-01T06:27:37.987Z",
"dateReserved": "2024-01-15T15:19:19.443Z",
"dateUpdated": "2024-08-01T22:59:32.176Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.1"
}