GitHub Advisoryadvisory · Packagist

GHSA-cgvv-3455-824j Moodle Session Fixation allows unauthenticated users to hijack sessions via sesskey parameter

MEDIUM Published 2025-06-24 Modified 2025-06-26 Official page ↗
Aliases
CVE-2025-53021
Ecosystem
Packagist
Packages
moodle/moodle
Severity
Moderate
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:N
Weaknesses
CWE-384
Reviewed
2025-06-26

Affected packages

• Packagist moodle/moodle: >= 3.0.0, < 4.0.0 → fixed in 4.0.0

Description

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.

Related

Alias · CVE (1)

  • CVE-2025-53021 A session fixation vulnerability in Moodle 3.x through 3.11.18 allows unauthenticated attackers to hijack user sessions via the sesskey… vulnerability

Weakness · CWE (1)

  • CWE-384 Session Fixation weakness

References