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Medium

Moodle Session Fixation allows unauthenticated users to hijack sessions via sesskey parameter

  • Disclosed: 24.06.2025
  • Updated: 11.10.2026 10:22

A session fixation vulnerability in Moodle 3.x through 3.11.18 allows unauthenticated attackers to hijack user sessions via the sesskey parameter. The sesskey can be obtained without authentication and reused within the OAuth2 login flow, resulting in the victim's session being linked to the attacker's. Successful exploitation results in full account takeover. According to the Moodle Releases page, "Bug fixes for security issues in 3.11.x ended 11 December 2023." NOTE: This vulnerability only affects products that are no longer supported by the maintainer.

Affected software

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PlatformPackageVulnerable versionsFixed in
Composer package moodle/moodle >= 3.0.0, < 4.0.0 4.0.0

References

CVSS score 4.2/10
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:N
Weakness (CWE)
CWE-384
Platform
Composer
Package
moodle/moodle
Disclosed
24.06.2025
Updated
11.10.2026 10:22

Sources and licenses

OSV / GitHub Advisory Database - GHSA-cgvv-3455-824j - CC BY 4.0

Vulnerability history: moodle/moodle

All published vulnerabilities of this package (Composer package), newest first. Shows whether this is a one-off slip or a package that needs watching.

All (437) in the archive
Total entries
437
First → latest
03.2021 02.2026
Without a fix
10
Exploited in attacks
0

Severity breakdown

  • Critical 16
  • High 68
  • Medium 318
  • Low 35

Disclosures per year

Severity:
  1. Moodle has a Remote Code Execution risk via file restore
    High · 7.2 CVE-2026-26045 >= 5.1.0-beta, < 5.1.2, >= 5.0.0-beta, < 5.0.5, < 4.5.9 5.1.2, 5.0.5, 4.5.9
  2. Moodle Affected by Improper Restriction of Excessive Authentication Attempts
    High · 7.5 CVE-2025-67853 < 4.1.22, >= 4.4.0-beta, < 4.4.12, >= 4.5.0-beta, < 4.5.8, >= 5.0.0-beta, < 5.0.4, >= 5.1.0-beta, < 5.1.1 4.1.22, 4.4.12, 4.5.8, 5.0.4, 5.1.1
  3. Moodle authentication bypass vulnerability
    High · 8.1 CVE-2025-67848 < 4.1.22, >= 4.4.0-beta, < 4.4.12, >= 4.5.0-beta, < 4.5.8, >= 5.0.0-beta, < 5.0.4, >= 5.1.0-beta, < 5.1.1 4.1.22, 4.4.12, 4.5.8, 5.0.4, 5.1.1
  4. Moodle Cross-site Scripting (XSS) vulnerability
    High · 7.3 CVE-2025-67849 < 4.1.22, >= 4.4.0-beta, < 4.4.12, >= 4.5.0-beta, < 4.5.8, >= 5.0.0-beta, < 5.0.4, >= 5.1.0-beta, < 5.1.1 4.1.22, 4.4.12, 4.5.8, 5.0.4, 5.1.1
  5. Moodle vulnerable to Cross-site Scripting
    High · 7.3 CVE-2025-67850 < 4.1.22, >= 4.4.0-beta, < 4.4.12, >= 4.5.0-beta, < 4.5.8, >= 5.0.0-beta, < 5.0.4, >= 5.1.0-beta, < 5.1.1 4.1.22, 4.4.12, 4.5.8, 5.0.4, 5.1.1
  6. Moodle affected by a code injection vulnerability
    High · 8.8 CVE-2025-67847 >= 5.1.0-beta, < 5.1.1, >= 5.0.0-beta, < 5.0.4, >= 4.5.0-beta, < 4.5.8, >= 4.2.0-beta, < 4.4.12, < 4.1.22 5.1.1, 5.0.4, 4.5.8, 4.4.12, 4.1.22
  7. Moodle vulnerable to brute-force password guesses
    High · 7.5 CVE-2025-62399 >= 5.0.0-beta, < 5.0.3, >= 4.5.0-beta, < 4.5.7, >= 4.2.0-beta, < 4.4.11, < 4.1.21 5.0.3, 4.5.7, 4.4.11, 4.1.21
  8. Moodle Session Fixation allows unauthenticated users to hijack sessions via sesskey parameter this entry
    Medium · 4.2 CVE-2025-53021 >= 3.0.0, < 4.0.0 4.0.0
  9. Moodle has an authenticated remote code execution risk in the Moodle LMS EQUELLA repository
    High · 8.8 CVE-2025-3642 < 4.1.18, >= 4.3.0-beta, < 4.3.12, >= 4.4.0-beta, < 4.4.8, >= 4.5.0-beta, < 4.5.4 4.1.18, 4.3.12, 4.4.8, 4.5.4
  10. Moodle has an authenticated remote code execution risk in the Moodle LMS Dropbox repository
    High · 8.8 CVE-2025-3641 < 4.1.18, >= 4.3.0-beta, < 4.3.12, >= 4.4.0-beta, < 4.4.8, >= 4.5.0-beta, < 4.5.4 4.1.18, 4.3.12, 4.4.8, 4.5.4
  11. Moodle allows unauthenticated REST API user data exposure
    High · 7.5 CVE-2025-32044 >= 4.5.0-beta, < 4.5.3 4.5.3
  12. Moodle allows reflected XSS via question bank filter
    High · 8.3 CVE-2025-26530 >= 4.5.0-beta, < 4.5.2, >= 4.4.0-beta, < 4.4.6, >= 4.3.0-beta, < 4.3.10 4.5.2, 4.4.6, 4.3.10
  13. Moodle has a stored XSS risk in admin live log
    High · 8.3 CVE-2025-26529 >= 4.5.0-beta, < 4.5.2, >= 4.4.0-beta, < 4.4.6, >= 4.3.0-beta, < 4.3.10, < 4.1.16 4.5.2, 4.4.6, 4.3.10, 4.1.16
  14. Moodle has an arbitrary file read risk through pdfTeX
    High · 8.6 CVE-2025-26525 >= 4.5.0-beta, < 4.5.2, >= 4.4.0-beta, < 4.4.6, >= 4.3.0-beta, < 4.3.10, < 4.1.16 4.5.2, 4.4.6, 4.3.10, 4.1.16
  15. Moodle has a SQL injection risk in course search module list filter
    High · 8.1 CVE-2025-26533 >= 4.5.0-beta, < 4.5.2, >= 4.4.0-beta, < 4.4.6, >= 4.3.0-beta, < 4.3.10, < 4.1.16 4.5.2, 4.4.6, 4.3.10, 4.1.16
  16. Moodle Remote Code Execution vulnerability
    High · 8.1 CVE-2024-43425 < 4.1.12, >= 4.2.0-beta, < 4.2.9, >= 4.3.0-beta, < 4.3.6, >= 4.4.0-beta, < 4.4.2 4.1.12, 4.2.9, 4.3.6, 4.4.2
  17. Moodle has CSRF risk in Feedback non-respondents report
    High · 8.1 CVE-2024-43434 < 4.1.12, >= 4.2.0-beta, < 4.2.9, >= 4.3.0-beta, < 4.3.6, >= 4.4.0-beta, < 4.4.2 4.1.12, 4.2.9, 4.3.6, 4.4.2
  18. Moodle ReCAPTCHA can be bypassed on the login page
    High · 7.5 CVE-2024-34009 >= 4.3.0, < 4.3.4 4.3.4
  19. Moodle CSRF risk in analytics management of models
    High · 8.8 CVE-2024-34008 >= 4.3.0, < 4.3.4, >= 4.2.0, < 4.2.7, < 4.1.10 4.3.4, 4.2.7, 4.1.10
  20. Moodle Authenticated LFI risk in some misconfigured shared hosting environments
    High · 6.5 CVE-2024-34005 >= 4.3.0, < 4.3.4, >= 4.2.0, < 4.2.7, < 4.1.10 4.3.4, 4.2.7, 4.1.10
  21. Moodle Authenticated LFI risk in some misconfigured shared hosting environments
    High · 6.5 CVE-2024-34002 >= 4.3.0, < 4.3.4, >= 4.2.0, < 4.2.7, < 4.1.10 4.3.4, 4.2.7, 4.1.10
  22. Moodle CSRF risk in admin preset tool management of presets
    High · 8.4 CVE-2024-34001 >= 4.3.0, < 4.3.4, >= 4.2.0, < 4.2.7, < 4.1.10 4.3.4, 4.2.7, 4.1.10
  23. Moodle Improper Input Validation
    High CVE-2024-33999 >= 4.3.0, < 4.3.4 4.3.4
  24. Uncontrolled Resource Consumption in moodle
    High · 7.5 CVE-2024-25978 >= 4.3.0, < 4.3.3, >= 4.2.0, < 4.2.6, < 4.1.9 4.3.3, 4.2.6, 4.1.9
  25. Cross-Site Request Forgery in moodle
    High · 8.8 CVE-2024-25982 >= 4.3.0, < 4.3.3, >= 4.2.0, < 4.2.6, < 4.1.9 4.3.3, 4.2.6, 4.1.9
  26. Moodle Code Injection vulnerability
    High · 8.8 CVE-2023-5540 < 4.3.0-rc2 4.3.0-rc2
  27. Moodle vulnerable to Server Side Request Forgery
    High · 7.5 CVE-2023-35133 >= 4.2.0, < 4.2.1, >= 4.1.0, < 4.1.4, >= 4.0.0, < 4.0.9, >= 3.10.0, < 3.11.15, < 3.9.22 4.2.1, 4.1.4, 4.0.9, 3.11.15, 3.9.22
  28. Moodle SQL Injection vulnerability
    High · 7.3 CVE-2023-30944 < 4.2.0-rc2 4.2.0-rc2
  29. Moodle's Mustache pix helper contained a potential Mustache injection risk if combined with user input
    Critical · 9.8 CVE-2023-28333 >= 4.1.0, < 4.1.2, >= 4.0.0, < 4.0.7, >= 3.11.0, < 3.11.13, < 3.9.20 4.1.2, 4.0.7, 3.11.13, 3.9.20
  30. Moodle SQL Injection vulnerability
    High · 8.8 CVE-2023-28329 >= 4.1.0, < 4.1.2, >= 4.0.0, < 4.0.7, >= 3.11.0, < 3.11.13, < 3.9.20 4.1.2, 4.0.7, 3.11.13, 3.9.20
  31. Moodle vulnerable to Cross-site Request Forgery
    High · 8.8 CVE-2023-28335 >= 4.1.0, < 4.1.2 4.1.2
  32. Moodle vulnerable to Uncontrolled Resource Consumption
    High · 7.5 CVE-2021-36395 >= 3.11.0-beta, < 3.11.1, >= 3.10.0-beta, < 3.10.5, < 3.9.8 3.11.1, 3.10.5, 3.9.8
  33. Moodle Session Fixation vulnerability
    Critical · 9.8 CVE-2021-36394 >= 3.11.0-beta, < 3.11.1, >= 3.10.0-beta, < 3.10.5, < 3.9.8 3.11.1, 3.10.5, 3.9.8
  34. Moodle vulnerable to Server-Side Request Forgery
    High · 7.5 CVE-2021-36396 >= 3.11.0-beta, < 3.11.1, >= 3.10.0-beta, < 3.10.5, < 3.9.8 3.11.1, 3.10.5, 3.9.8
  35. Moodle SQL Injection vulnerability
    Critical · 9.8 CVE-2021-36393 >= 3.11.0-beta, < 3.11.1, >= 3.10.0-beta, < 3.10.5, < 3.9.8 3.11.1, 3.10.5, 3.9.8
  36. Moodle SQL Injection vulnerability
    Critical · 9.8 CVE-2021-36392 >= 3.11.0-beta, < 3.11.1, >= 3.10.0-beta, < 3.10.5, < 3.9.8 3.11.1, 3.10.5, 3.9.8
  37. Moodle Improper Access Control vulnerability
    High · 8.2 CVE-2023-23923 < 3.9.19, >= 3.10.0, < 3.11.12, >= 4.0.0-beta, < 4.0.6, >= 4.1.0-beta, < 4.1.1 3.9.19, 3.11.12, 4.0.6, 4.1.1
  38. Moodle blind Server-Side Request Forgery (SSRF) vulnerability in LTI provider library
    Critical · 9.1 CVE-2022-45152 >= 3.9, < 3.9.18, >= 3.11, < 3.11.11, >= 4.0, < 4.0.5 3.9.18, 3.11.11, 4.0.5
  39. Moodle Cross-Site Request Forgery (CSRF)
    High · 8.8 CVE-2022-2986 >= 3.11, < 3.11.9, >= 4.0, < 4.0.3 3.11.9, 4.0.3
  40. Moodle Minor SQL injection risk in admin user browsing
    Critical · 9.8 CVE-2022-40315 >= 3.9, < 3.9.17, >= 3.11, < 3.11.10, >= 4.0, < 4.0.4 3.9.17, 3.11.10, 4.0.4
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