Read the docs
TI-2025-33023 Aliases CVE-2025-53021GHSA-cgvv-3455-824j

Session fixation in Moodle

Priority MEDIUM 53CWE-384Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
Required
Attack complexity
High
Impact type
Spoofing
Confidentiality · integrity · availability
Low · Low · None
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-384.

Summary

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.0037 31st percentileScored 2026-11-07
Fix Fixed moodle/moodle (Packagist): 4.0.0

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
MoodleMoodle3 – 3.11.18—No fix listedCNA
—moodle/moodle (Packagist)3.0.0 to before 4.0.04.0.0Patch availableGHSA-cgvv-3455-824j
  • Moodle VendorMoodle Affected 3 – 3.11.18 Fixed in — No fix listed CNA
  • moodle/moodle (Packagist) Vendor— Affected 3.0.0 to before 4.0.0 Fixed in 4.0.0 Patch available GHSA-cgvv-3455-824j

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:moodle:moodle:*:*:*:*:*:*:*:*3.0.0 – 3.11.18VulnerableMoodle
  • cpe:2.3:a:moodle:moodle:*:*:*:*:*:*:*:* Versions 3.0.0 – 3.11.18 Vulnerable ·Moodle

Remediation

  • Fix · GHSA-cgvv-3455-824j moodle/moodle (Packagist) Fixed in 4.0.0 Advisory →

Vendor assessments

Red Hat

Red Hat's page for this CVE →

Not affected: 1 product
  • Red Hat

Timeline

  1. 2026-10-02 Threatist record created from CVE-2025-53021
  2. 2026-10-03 Alias added: GHSA-cgvv-3455-824j

References

Advisory 2

Other 3

  • TI-2024-22468 moodle: unsafe direct use of $_SERVER['HTTP_REFERER'] in admin/tool/mfa/index.php CVSS 3.1CRITICAL 9.8
  • TI-2021-14741 In Moodle, an SQL injection risk was identified in the library fetching a user's recent courses. CVSS 3.1CRITICAL 9.8
  • TI-2024-29071 Moodle: remote code execution via calculated question types CVSS 3.1HIGH 8.1
  • TI-2016-06653 Moodle 3.1.2 allows remote attackers to obtain sensitive information via unspecified… CVSS 3.1HIGH 7.5
  • TI-2022-00259 SQL injection in moodle CVSS 3.1CRITICAL 9.8
  • TI-2022-16116 Path traversal in Moodle CVSS 3.1HIGH 7.5
See all 636 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences