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14 vulnerabilities found for MaxSite CMS by MaxSite
CVE-2026-87930 (GCVE-0-2026-87930)
Vulnerability from nvd – Published: 2026-09-09 16:45 – Updated: 2026-09-24 14:21 X_Open Source Unsupported When Assigned
VLAI
EPSS
VEX
Title
MaxSite CMS through 109.6 PHP Object Injection via ci_session
Summary
MaxSite CMS through 109.6 passes the ci_session cookie to unserialize() without class restrictions, allowing unauthenticated attackers to inject PHP objects. Attackers can forge valid session cookies using the hardcoded encryption key to trigger magic methods and corrupt application state or achieve code execution if gadget classes exist.
Severity
8.1 (High)
SSVC
Exploitation: poc
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-09 17:22 UTC
CWE
- CWE-502 - Deserialization of Untrusted Data
Assigner
References
7 references
| URL | Tags |
|---|---|
| https://github.com/maxsite/cms | product |
| https://github.com/EviL0rd/maxsite-cve6/blob/main… | exploittechnical-description |
| https://github.com/maxsite/cms/blob/2ca0a0c7d1d71… | technical-description |
| https://github.com/maxsite/cms/blob/2ca0a0c7d1d71… | technical-description |
| https://github.com/EviL0rd/maxsite-cve4/blob/main… | technical-description |
| https://github.com/maxsite/cms/blob/2ca0a0c7d1d71… | technical-description |
| https://www.vulncheck.com/advisories/maxsite-cms-… | third-party-advisory |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| MaxSite | MaxSite CMS |
Affected:
0.78 , ≤ 109.6
(custom)
cpe:2.3:a:max-3000:maxsite_cms:*:*:*:*:*:*:*:* |
Date Public
2026-09-09 00:00
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CVE-2026-87929 (GCVE-0-2026-87929)
Vulnerability from nvd – Published: 2026-09-09 16:45 – Updated: 2026-09-24 14:21 X_Open Source Unsupported When Assigned
VLAI
EPSS
VEX
Title
MaxSite CMS through 109.6 Authentication Bypass via Hardcoded Encryption Key
Summary
MaxSite CMS through 109.6 ships with a hardcoded session encryption key in application/config/config.php that is never changed during installation, allowing unauthenticated attackers to forge administrator session cookies. Attackers can mint a malicious ci_session cookie with administrator privileges by computing an HMAC-SHA1 using the publicly known encryption key, bypassing authentication checks in is_login() and mso_check_allow() functions.
Severity
9.8 (Critical)
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-14 13:40 UTC
CWE
- CWE-321 - Use of Hard-coded Cryptographic Key
Assigner
References
5 references
| URL | Tags |
|---|---|
| https://github.com/maxsite/cms | product |
| https://github.com/EviL0rd/maxsite-cve4/blob/main… | exploittechnical-description |
| https://github.com/maxsite/cms/blob/2ca0a0c7d1d71… | technical-description |
| https://github.com/maxsite/cms/blob/2ca0a0c7d1d71… | technical-description |
| https://www.vulncheck.com/advisories/maxsite-cms-… | third-party-advisory |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| MaxSite | MaxSite CMS |
Affected:
0.78 , ≤ 109.6
(custom)
cpe:2.3:a:max-3000:maxsite_cms:*:*:*:*:*:*:*:* |
Date Public
2026-09-09 00:00
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CVE-2026-87928 (GCVE-0-2026-87928)
Vulnerability from nvd – Published: 2026-09-09 16:44 – Updated: 2026-09-24 14:21 X_Open Source Unsupported When Assigned
VLAI
EPSS
VEX
Title
MaxSite CMS 0.94 through 109.6 HTML Upload XSS via admin_page
Summary
MaxSite CMS versions 0.94 through 109.6 contain a cross-site scripting vulnerability in the admin_page upload handler that allows any logged-in user to upload HTML files. Attackers can upload HTML containing malicious scripts to the uploads/_pages/ directory, which executes in visitors' browsers when the file is accessed, enabling persistent stored cross-site scripting attacks.
Severity
5.4 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-18 17:10 UTC
CWE
- CWE-434 - Unrestricted Upload of File with Dangerous Type
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://github.com/maxsite/cms | product |
| https://github.com/EviL0rd/maxsite-cve2/blob/main… | exploittechnical-description |
| https://github.com/maxsite/cms/blob/2ca0a0c7d1d71… | technical-description |
| https://www.vulncheck.com/advisories/maxsite-cms-… | third-party-advisory |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| MaxSite | MaxSite CMS |
Affected:
0.94 , ≤ 109.6
(custom)
cpe:2.3:a:max-3000:maxsite_cms:*:*:*:*:*:*:*:* |
Date Public
2026-09-09 00:00
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CVE-2026-87927 (GCVE-0-2026-87927)
Vulnerability from nvd – Published: 2026-09-09 16:44 – Updated: 2026-09-24 14:21 X_Open Source Unsupported When Assigned
VLAI
EPSS
VEX
Title
MaxSite CMS through 109.6 Local File Inclusion via ajax dispatcher
Summary
MaxSite CMS through 109.6 contains a local file inclusion vulnerability in the ajax and require-maxsite dispatchers that allows unauthenticated attackers to execute privileged handler files by supplying base64-encoded path traversal sequences. Attackers can bypass path validation checks and execute admin-gated handler actions without authentication to access sensitive functionality.
Severity
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-09 18:08 UTC
CWE
- CWE-98 - Improper Control of Filename for Include/Require Statement in PHP Program ('PHP Remote File Inclusion')
Assigner
References
5 references
| URL | Tags |
|---|---|
| https://github.com/maxsite/cms | product |
| https://github.com/EviL0rd/maxsite-cve1/blob/main… | exploittechnical-description |
| https://github.com/maxsite/cms/blob/2ca0a0c7d1d71… | technical-description |
| https://github.com/maxsite/cms/blob/2ca0a0c7d1d71… | technical-description |
| https://www.vulncheck.com/advisories/maxsite-cms-… | third-party-advisory |
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2026-09-09 00:00
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CVE-2026-70554 (GCVE-0-2026-70554)
Vulnerability from nvd – Published: 2026-08-04 20:11 – Updated: 2026-09-24 14:18
VLAI
EPSS
VEX
Title
MaxSite CMS Unauthenticated PHP Object Injection via maxsite_comuser Cookie
Summary
MaxSite CMS contains a PHP object injection vulnerability that allows unauthenticated attackers to execute arbitrary code by passing attacker-controlled serialized data in the maxsite_comuser cookie directly to unserialize() without validation or class allowlisting. Attackers can craft a malicious serialized PHP object payload delivered in a single HTTP request to trigger magic methods during object graph reconstruction, enabling property-oriented programming attacks or remote code execution via available gadget chains such as those targeting SoapClient or Imagick extensions.
Severity
9.8 (Critical)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-05 13:52 UTC
CWE
- CWE-502 - Deserialization of Untrusted Data
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://github.com/maxsite/cms | product |
| https://max-3000.com/page/maxsite-cms-109-6 | patch |
| https://www.vulncheck.com/advisories/maxsite-cms-… | third-party-advisory |
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1 product
| Vendor | Product | Version | |
|---|---|---|---|
| MaxSite | MaxSite CMS |
Affected:
0.78 , ≤ 109.5
(custom)
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2026-08-04 00:00
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CVE-2026-70553 (GCVE-0-2026-70553)
Vulnerability from nvd – Published: 2026-08-04 19:37 – Updated: 2026-08-14 16:51
VLAI
EPSS
VEX
Title
MaxSite CMS Unauthenticated RCE via Install Endpoint
Summary
MaxSite CMS contains a remote code execution vulnerability that allows unauthenticated attackers to inject arbitrary PHP code into the application configuration file by submitting crafted POST requests to the install endpoint after installation is complete. Attackers can supply a malicious db_dbprefix value containing a single quote to break out of a PHP string literal in application/config/database.php, appending attacker-controlled PHP statements that are executed by the web server on every subsequent request, resulting in persistent unauthenticated remote code execution as the web-server process user.
Severity
9.8 (Critical)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-05 19:04 UTC
CWE
- CWE-94 - Improper Control of Generation of Code ('Code Injection')
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://github.com/maxsite/cms | product |
| https://max-3000.com/page/maxsite-cms-109-6 | patch |
| https://www.vulncheck.com/advisories/maxsite-cms-… | third-party-advisory |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| MaxSite | MaxSite CMS |
Affected:
105.2 , ≤ 109.5
(custom)
Unaffected: 109.6 (custom) cpe:2.3:a:max-3000:maxsite_cms:*:*:*:*:*:*:*:* |
Date Public
2026-08-04 00:00
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CVE-2026-70552 (GCVE-0-2026-70552)
Vulnerability from nvd – Published: 2026-08-04 19:28 – Updated: 2026-09-24 14:18
VLAI
EPSS
VEX
Title
MaxSite CMS 109.5 Unauthenticated AJAX Dispatcher Bypass via ajax.php
Summary
MaxSite CMS 109.5 and earlier contains an authentication bypass vulnerability in the AJAX dispatcher that allows unauthenticated attackers to access admin-gated endpoints by supplying any X-Requested-With header and requesting a base64-encoded path resolving to any *-ajax.php file in the codebase. Attackers can exploit this dispatcher bypass to reach privileged plugin endpoints without credentials, enabling actions such as manipulating poll states and vote counts, and amplifying the impact of any dangerous operation performed by admin-only ajax files across the plugin tree.
Severity
9.8 (Critical)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-05 13:49 UTC
CWE
- CWE-306 - Missing Authentication for Critical Function
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://github.com/maxsite/cms | product |
| https://max-3000.com/page/maxsite-cms-109-6 | patch |
| https://www.vulncheck.com/advisories/maxsite-cms-… | third-party-advisory |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| MaxSite | MaxSite CMS |
Affected:
0.78 , ≤ 109.5
(custom)
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Date Public
2026-08-04 00:00
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CVE-2026-87930 (GCVE-0-2026-87930)
Vulnerability from cvelistv5 – Published: 2026-09-09 16:45 – Updated: 2026-09-24 14:21 X_Open Source Unsupported When Assigned
VLAI
EPSS
VEX
Title
MaxSite CMS through 109.6 PHP Object Injection via ci_session
Summary
MaxSite CMS through 109.6 passes the ci_session cookie to unserialize() without class restrictions, allowing unauthenticated attackers to inject PHP objects. Attackers can forge valid session cookies using the hardcoded encryption key to trigger magic methods and corrupt application state or achieve code execution if gadget classes exist.
Severity
8.1 (High)
SSVC
Exploitation: poc
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-09 17:22 UTC
CWE
- CWE-502 - Deserialization of Untrusted Data
Assigner
References
7 references
| URL | Tags |
|---|---|
| https://github.com/maxsite/cms | product |
| https://github.com/EviL0rd/maxsite-cve6/blob/main… | exploittechnical-description |
| https://github.com/maxsite/cms/blob/2ca0a0c7d1d71… | technical-description |
| https://github.com/maxsite/cms/blob/2ca0a0c7d1d71… | technical-description |
| https://github.com/EviL0rd/maxsite-cve4/blob/main… | technical-description |
| https://github.com/maxsite/cms/blob/2ca0a0c7d1d71… | technical-description |
| https://www.vulncheck.com/advisories/maxsite-cms-… | third-party-advisory |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| MaxSite | MaxSite CMS |
Affected:
0.78 , ≤ 109.6
(custom)
cpe:2.3:a:max-3000:maxsite_cms:*:*:*:*:*:*:*:* |
Date Public
2026-09-09 00:00
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CVE-2026-87929 (GCVE-0-2026-87929)
Vulnerability from cvelistv5 – Published: 2026-09-09 16:45 – Updated: 2026-09-24 14:21 X_Open Source Unsupported When Assigned
VLAI
EPSS
VEX
Title
MaxSite CMS through 109.6 Authentication Bypass via Hardcoded Encryption Key
Summary
MaxSite CMS through 109.6 ships with a hardcoded session encryption key in application/config/config.php that is never changed during installation, allowing unauthenticated attackers to forge administrator session cookies. Attackers can mint a malicious ci_session cookie with administrator privileges by computing an HMAC-SHA1 using the publicly known encryption key, bypassing authentication checks in is_login() and mso_check_allow() functions.
Severity
9.8 (Critical)
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-14 13:40 UTC
CWE
- CWE-321 - Use of Hard-coded Cryptographic Key
Assigner
References
5 references
| URL | Tags |
|---|---|
| https://github.com/maxsite/cms | product |
| https://github.com/EviL0rd/maxsite-cve4/blob/main… | exploittechnical-description |
| https://github.com/maxsite/cms/blob/2ca0a0c7d1d71… | technical-description |
| https://github.com/maxsite/cms/blob/2ca0a0c7d1d71… | technical-description |
| https://www.vulncheck.com/advisories/maxsite-cms-… | third-party-advisory |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| MaxSite | MaxSite CMS |
Affected:
0.78 , ≤ 109.6
(custom)
cpe:2.3:a:max-3000:maxsite_cms:*:*:*:*:*:*:*:* |
Date Public
2026-09-09 00:00
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CVE-2026-87928 (GCVE-0-2026-87928)
Vulnerability from cvelistv5 – Published: 2026-09-09 16:44 – Updated: 2026-09-24 14:21 X_Open Source Unsupported When Assigned
VLAI
EPSS
VEX
Title
MaxSite CMS 0.94 through 109.6 HTML Upload XSS via admin_page
Summary
MaxSite CMS versions 0.94 through 109.6 contain a cross-site scripting vulnerability in the admin_page upload handler that allows any logged-in user to upload HTML files. Attackers can upload HTML containing malicious scripts to the uploads/_pages/ directory, which executes in visitors' browsers when the file is accessed, enabling persistent stored cross-site scripting attacks.
Severity
5.4 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-18 17:10 UTC
CWE
- CWE-434 - Unrestricted Upload of File with Dangerous Type
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://github.com/maxsite/cms | product |
| https://github.com/EviL0rd/maxsite-cve2/blob/main… | exploittechnical-description |
| https://github.com/maxsite/cms/blob/2ca0a0c7d1d71… | technical-description |
| https://www.vulncheck.com/advisories/maxsite-cms-… | third-party-advisory |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| MaxSite | MaxSite CMS |
Affected:
0.94 , ≤ 109.6
(custom)
cpe:2.3:a:max-3000:maxsite_cms:*:*:*:*:*:*:*:* |
Date Public
2026-09-09 00:00
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CVE-2026-87927 (GCVE-0-2026-87927)
Vulnerability from cvelistv5 – Published: 2026-09-09 16:44 – Updated: 2026-09-24 14:21 X_Open Source Unsupported When Assigned
VLAI
EPSS
VEX
Title
MaxSite CMS through 109.6 Local File Inclusion via ajax dispatcher
Summary
MaxSite CMS through 109.6 contains a local file inclusion vulnerability in the ajax and require-maxsite dispatchers that allows unauthenticated attackers to execute privileged handler files by supplying base64-encoded path traversal sequences. Attackers can bypass path validation checks and execute admin-gated handler actions without authentication to access sensitive functionality.
Severity
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-09 18:08 UTC
CWE
- CWE-98 - Improper Control of Filename for Include/Require Statement in PHP Program ('PHP Remote File Inclusion')
Assigner
References
5 references
| URL | Tags |
|---|---|
| https://github.com/maxsite/cms | product |
| https://github.com/EviL0rd/maxsite-cve1/blob/main… | exploittechnical-description |
| https://github.com/maxsite/cms/blob/2ca0a0c7d1d71… | technical-description |
| https://github.com/maxsite/cms/blob/2ca0a0c7d1d71… | technical-description |
| https://www.vulncheck.com/advisories/maxsite-cms-… | third-party-advisory |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| MaxSite | MaxSite CMS |
Affected:
0.78 , ≤ 109.6
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cpe:2.3:a:max-3000:maxsite_cms:*:*:*:*:*:*:*:* |
Date Public
2026-09-09 00:00
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CVE-2026-70554 (GCVE-0-2026-70554)
Vulnerability from cvelistv5 – Published: 2026-08-04 20:11 – Updated: 2026-09-24 14:18
VLAI
EPSS
VEX
Title
MaxSite CMS Unauthenticated PHP Object Injection via maxsite_comuser Cookie
Summary
MaxSite CMS contains a PHP object injection vulnerability that allows unauthenticated attackers to execute arbitrary code by passing attacker-controlled serialized data in the maxsite_comuser cookie directly to unserialize() without validation or class allowlisting. Attackers can craft a malicious serialized PHP object payload delivered in a single HTTP request to trigger magic methods during object graph reconstruction, enabling property-oriented programming attacks or remote code execution via available gadget chains such as those targeting SoapClient or Imagick extensions.
Severity
9.8 (Critical)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-05 13:52 UTC
CWE
- CWE-502 - Deserialization of Untrusted Data
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://github.com/maxsite/cms | product |
| https://max-3000.com/page/maxsite-cms-109-6 | patch |
| https://www.vulncheck.com/advisories/maxsite-cms-… | third-party-advisory |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| MaxSite | MaxSite CMS |
Affected:
0.78 , ≤ 109.5
(custom)
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2026-08-04 00:00
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CVE-2026-70553 (GCVE-0-2026-70553)
Vulnerability from cvelistv5 – Published: 2026-08-04 19:37 – Updated: 2026-08-14 16:51
VLAI
EPSS
VEX
Title
MaxSite CMS Unauthenticated RCE via Install Endpoint
Summary
MaxSite CMS contains a remote code execution vulnerability that allows unauthenticated attackers to inject arbitrary PHP code into the application configuration file by submitting crafted POST requests to the install endpoint after installation is complete. Attackers can supply a malicious db_dbprefix value containing a single quote to break out of a PHP string literal in application/config/database.php, appending attacker-controlled PHP statements that are executed by the web server on every subsequent request, resulting in persistent unauthenticated remote code execution as the web-server process user.
Severity
9.8 (Critical)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-05 19:04 UTC
CWE
- CWE-94 - Improper Control of Generation of Code ('Code Injection')
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://github.com/maxsite/cms | product |
| https://max-3000.com/page/maxsite-cms-109-6 | patch |
| https://www.vulncheck.com/advisories/maxsite-cms-… | third-party-advisory |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| MaxSite | MaxSite CMS |
Affected:
105.2 , ≤ 109.5
(custom)
Unaffected: 109.6 (custom) cpe:2.3:a:max-3000:maxsite_cms:*:*:*:*:*:*:*:* |
Date Public
2026-08-04 00:00
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CVE-2026-70552 (GCVE-0-2026-70552)
Vulnerability from cvelistv5 – Published: 2026-08-04 19:28 – Updated: 2026-09-24 14:18
VLAI
EPSS
VEX
Title
MaxSite CMS 109.5 Unauthenticated AJAX Dispatcher Bypass via ajax.php
Summary
MaxSite CMS 109.5 and earlier contains an authentication bypass vulnerability in the AJAX dispatcher that allows unauthenticated attackers to access admin-gated endpoints by supplying any X-Requested-With header and requesting a base64-encoded path resolving to any *-ajax.php file in the codebase. Attackers can exploit this dispatcher bypass to reach privileged plugin endpoints without credentials, enabling actions such as manipulating poll states and vote counts, and amplifying the impact of any dangerous operation performed by admin-only ajax files across the plugin tree.
Severity
9.8 (Critical)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-05 13:49 UTC
CWE
- CWE-306 - Missing Authentication for Critical Function
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://github.com/maxsite/cms | product |
| https://max-3000.com/page/maxsite-cms-109-6 | patch |
| https://www.vulncheck.com/advisories/maxsite-cms-… | third-party-advisory |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| MaxSite | MaxSite CMS |
Affected:
0.78 , ≤ 109.5
(custom)
Unaffected: 109.6 (custom) cpe:2.3:a:max-3000:maxsite_cms:*:*:*:*:*:*:*:* |
Date Public
2026-08-04 00:00
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