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Medium

Moodle TeX formula editor is vulnerable to DoS through lack of execution time limits

  • Disclosed: 21.02.2026
  • Updated: 11.10.2026 10:22

A Denial of Service vulnerability was identified in Moodle’s TeX formula editor. When rendering TeX content using mimetex, insufficient execution time limits could allow specially crafted formulas to consume excessive server resources. An authenticated user could abuse this behavior to degrade performance or cause service interruption.

Affected software

Click a technology to see all vulnerabilities affecting it.

PlatformPackageVulnerable versionsFixed in
Composer package moodle/moodle >= 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

References

CVSS score 6.5/10
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Weakness (CWE)
CWE-400, CWE-770
Platform
Composer
Package
moodle/moodle
Disclosed
21.02.2026
Updated
11.10.2026 10:22

Sources and licenses

OSV / GitHub Advisory Database - GHSA-cg8j-5cr2-568q - 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 TeX formula editor is vulnerable to DoS through lack of execution time limits this entry
    Medium · 6.5 CVE-2026-26047 >= 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 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
  3. 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
  4. 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
  5. 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
  6. 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
  7. 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
  8. 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
  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
Show more (20) Showing 20 of 85

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