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CVE-2026-49954 (GCVE-0-2026-49954)

Vulnerability from nvd – Published: 2026-06-15 18:50 – Updated: 2026-06-16 15:20 X_Open Source

Title

Discuz! X5.0 Local File Inclusion via enable_disable.php Plugin Directory

Summary

Discuz! X5.0 releases 20260320 through 20260610 contain a local file inclusion vulnerability that allows authenticated administrators to execute arbitrary code by importing a specially crafted plugin configuration containing path traversal sequences in the directory attribute. Attackers can trigger an exception during plugin installation to bypass sanitization routines, causing malicious paths to be stored unsanitized and subsequently passed to include(), which combined with file upload functionality escalates to arbitrary code execution in the context of the web server user.

Severity

8.6 (High)


                        
                          CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

7.2 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

SSVC

Exploitation: poc Automatable: no Technical Impact: total

CISA Coordinator (v2.0.3)

CWE

CWE-98 - Improper Control of Filename for Include/Require Statement in PHP Program ('PHP Remote File Inclusion')

Assigner

VulnCheck

References

4 references

URL	Tags
https://karmainsecurity.com/KIS-2026-11	technical-description
https://karmainsecurity.com/chaining-bugs-in-disc…	exploit
https://www.vulncheck.com/advisories/discuz-x5-0-…	third-party-advisory
http://seclists.org/fulldisclosure/2026/Jun/5

Impacted products

1 product

Vendor	Product	Version
Discuz!	Discuz! X5.0	Affected: 20260320 , ≤ 20260610 (date)

Date Public

2026-06-13 00:00

Credits

Egidio Romano

Show details on NVD website

JSON

To clipboard

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CVE-2026-49953 (GCVE-0-2026-49953)

Vulnerability from nvd – Published: 2026-06-15 18:45 – Updated: 2026-06-16 09:48 X_Open Source

Title

Discuz! X5.0 CAPTCHA Bypass via Predictable Character Set

Summary

Discuz! X5.0 releases 20260320 through 20260610 contains a CAPTCHA bypass vulnerability that allows unauthenticated remote attackers to defeat challenge controls by exploiting limited complexity and predictable character sets in generated CAPTCHA images. Attackers can train a custom optical character recognition model against collected CAPTCHA samples to reliably predict challenge text, bypassing protections on login, registration, and other functionality from automated abuse.

Severity

6.9 (Medium)


                        
                          CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N

6.5 (Medium)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

SSVC

Exploitation: poc Automatable: yes Technical Impact: partial

CISA Coordinator (v2.0.3)

CWE

CWE-804 - Guessable CAPTCHA

Assigner

VulnCheck

References

4 references

URL	Tags
https://karmainsecurity.com/KIS-2026-10	technical-description
https://karmainsecurity.com/chaining-bugs-in-disc…	exploit
https://www.vulncheck.com/advisories/discuz-x5-0-…	third-party-advisory
http://seclists.org/fulldisclosure/2026/Jun/4

Impacted products

1 product

Vendor	Product	Version
Discuz!	Discuz! X5.0	Affected: 20260320 , ≤ 20260610 (date)

Date Public

2026-06-13 00:00

Credits

Egidio Romano

Show details on NVD website

JSON

To clipboard

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CVE-2026-49952 (GCVE-0-2026-49952)

Vulnerability from nvd – Published: 2026-06-15 18:43 – Updated: 2026-06-16 09:48 X_Open Source

Title

Discuz! X5.0 Authentication Bypass via dbbak.php Encryption Oracle

Summary

Discuz! X5.0 releases 20260320 through 20260501 contains an authentication bypass vulnerability that allows unauthenticated remote attackers to gain unauthorized access to database backup and restore functionality by exploiting a shared cryptographic key between UCenter integration and the database backup API exposed by dbbak.php. Attackers can inject a crafted payload through the username parameter during login to abuse the encryption oracle in logging_ctl::logging_more(), obtain a legitimately signed token, and use it to bypass authorization for database export and import operations, with the additional ability to trigger a race condition to impersonate arbitrary users.

Severity

9.3 (Critical)


                        
                          CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N

9.1 (Critical)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

SSVC

Exploitation: poc Automatable: yes Technical Impact: total

CISA Coordinator (v2.0.3)

CWE

CWE-323 - Reusing a Nonce, Key Pair in Encryption

Assigner

VulnCheck

References

5 references

URL	Tags
https://karmainsecurity.com/KIS-2026-09	technical-description
https://karmainsecurity.com/chaining-bugs-in-disc…	exploit
https://gitee.com/Discuz/DiscuzX/commit/9962dad52…	patch
https://www.vulncheck.com/advisories/discuz-x5-0-…	third-party-advisory
http://seclists.org/fulldisclosure/2026/Jun/3

Impacted products

1 product

Vendor	Product	Version
Discuz!	Discuz! X5.0	Affected: 20260320 , ≤ 20260501 (date)

Date Public

2026-05-09 00:00

Credits

Egidio Romano

Show details on NVD website

JSON

To clipboard

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CVE-2026-49954 (GCVE-0-2026-49954)

Vulnerability from cvelistv5 – Published: 2026-06-15 18:50 – Updated: 2026-06-16 15:20 X_Open Source

Title

Discuz! X5.0 Local File Inclusion via enable_disable.php Plugin Directory

Summary

Discuz! X5.0 releases 20260320 through 20260610 contain a local file inclusion vulnerability that allows authenticated administrators to execute arbitrary code by importing a specially crafted plugin configuration containing path traversal sequences in the directory attribute. Attackers can trigger an exception during plugin installation to bypass sanitization routines, causing malicious paths to be stored unsanitized and subsequently passed to include(), which combined with file upload functionality escalates to arbitrary code execution in the context of the web server user.

Severity

8.6 (High)


                        
                          CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

7.2 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

SSVC

Exploitation: poc Automatable: no Technical Impact: total

CISA Coordinator (v2.0.3)

CWE

CWE-98 - Improper Control of Filename for Include/Require Statement in PHP Program ('PHP Remote File Inclusion')

Assigner

VulnCheck

References

4 references

URL	Tags
https://karmainsecurity.com/KIS-2026-11	technical-description
https://karmainsecurity.com/chaining-bugs-in-disc…	exploit
https://www.vulncheck.com/advisories/discuz-x5-0-…	third-party-advisory
http://seclists.org/fulldisclosure/2026/Jun/5

Impacted products

1 product

Vendor	Product	Version
Discuz!	Discuz! X5.0	Affected: 20260320 , ≤ 20260610 (date)

Date Public

2026-06-13 00:00

Credits

Egidio Romano

Show details on NVD website

JSON

To clipboard

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CVE-2026-49953 (GCVE-0-2026-49953)

Vulnerability from cvelistv5 – Published: 2026-06-15 18:45 – Updated: 2026-06-16 09:48 X_Open Source

Title

Discuz! X5.0 CAPTCHA Bypass via Predictable Character Set

Summary

Discuz! X5.0 releases 20260320 through 20260610 contains a CAPTCHA bypass vulnerability that allows unauthenticated remote attackers to defeat challenge controls by exploiting limited complexity and predictable character sets in generated CAPTCHA images. Attackers can train a custom optical character recognition model against collected CAPTCHA samples to reliably predict challenge text, bypassing protections on login, registration, and other functionality from automated abuse.

Severity

6.9 (Medium)


                        
                          CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N

6.5 (Medium)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

SSVC

Exploitation: poc Automatable: yes Technical Impact: partial

CISA Coordinator (v2.0.3)

CWE

CWE-804 - Guessable CAPTCHA

Assigner

VulnCheck

References

4 references

URL	Tags
https://karmainsecurity.com/KIS-2026-10	technical-description
https://karmainsecurity.com/chaining-bugs-in-disc…	exploit
https://www.vulncheck.com/advisories/discuz-x5-0-…	third-party-advisory
http://seclists.org/fulldisclosure/2026/Jun/4

Impacted products

1 product

Vendor	Product	Version
Discuz!	Discuz! X5.0	Affected: 20260320 , ≤ 20260610 (date)

Date Public

2026-06-13 00:00

Credits

Egidio Romano

Show details on NVD website

JSON

To clipboard

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CVE-2026-49952 (GCVE-0-2026-49952)

Vulnerability from cvelistv5 – Published: 2026-06-15 18:43 – Updated: 2026-06-16 09:48 X_Open Source

Title

Discuz! X5.0 Authentication Bypass via dbbak.php Encryption Oracle

Summary

Discuz! X5.0 releases 20260320 through 20260501 contains an authentication bypass vulnerability that allows unauthenticated remote attackers to gain unauthorized access to database backup and restore functionality by exploiting a shared cryptographic key between UCenter integration and the database backup API exposed by dbbak.php. Attackers can inject a crafted payload through the username parameter during login to abuse the encryption oracle in logging_ctl::logging_more(), obtain a legitimately signed token, and use it to bypass authorization for database export and import operations, with the additional ability to trigger a race condition to impersonate arbitrary users.

Severity

9.3 (Critical)


                        
                          CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N

9.1 (Critical)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

SSVC

Exploitation: poc Automatable: yes Technical Impact: total

CISA Coordinator (v2.0.3)

CWE

CWE-323 - Reusing a Nonce, Key Pair in Encryption

Assigner

VulnCheck

References

5 references

URL	Tags
https://karmainsecurity.com/KIS-2026-09	technical-description
https://karmainsecurity.com/chaining-bugs-in-disc…	exploit
https://gitee.com/Discuz/DiscuzX/commit/9962dad52…	patch
https://www.vulncheck.com/advisories/discuz-x5-0-…	third-party-advisory
http://seclists.org/fulldisclosure/2026/Jun/3

Impacted products

1 product

Vendor	Product	Version
Discuz!	Discuz! X5.0	Affected: 20260320 , ≤ 20260501 (date)

Date Public

2026-05-09 00:00

Credits

Egidio Romano

Show details on NVD website

JSON

To clipboard

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            "patch"
          ],
          "url": "https://gitee.com/Discuz/DiscuzX/commit/9962dad52c4c6999dabaf91ecd70377c680ff3c6"
        },
        {
          "tags": [
            "third-party-advisory"
          ],
          "url": "https://www.vulncheck.com/advisories/discuz-x5-0-authentication-bypass-via-dbbak-php-encryption-oracle"
        }
      ],
      "source": {
        "discovery": "UNKNOWN"
      },
      "tags": [
        "x_open-source"
      ],
      "title": "Discuz! X5.0 Authentication Bypass via dbbak.php Encryption Oracle",
      "x_generator": {
        "engine": "vulncheck"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10",
    "assignerShortName": "VulnCheck",
    "cveId": "CVE-2026-49952",
    "datePublished": "2026-06-15T18:43:21.990Z",
    "dateReserved": "2026-06-02T16:30:15.232Z",
    "dateUpdated": "2026-06-16T09:48:23.903Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

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6 vulnerabilities found for Discuz! X5.0 by Discuz!

CVE-2026-49954 (GCVE-0-2026-49954)

CVE-2026-49953 (GCVE-0-2026-49953)

CVE-2026-49952 (GCVE-0-2026-49952)

CVE-2026-49954 (GCVE-0-2026-49954)

CVE-2026-49953 (GCVE-0-2026-49953)

CVE-2026-49952 (GCVE-0-2026-49952)