CVE-2025-53021

Published Jun 24, 2025 CVSS 3.1 · 4.2 Medium EPSS < 1% KEV · Not listed
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

Source ID Title
EUVD EUVD EUVD-2025-19060 Moodle Session Fixation allows unauthenticated users to hijack sessions via sesskey parameter
Github GHSA Github GHSA GHSA-cgvv-3455-824j Moodle Session Fixation allows unauthenticated users to hijack sessions via sesskey parameter
History
Type Values Removed Values Added
First Time appeared Moodle
Moodle moodle
CPEs cpe:2.3:a:moodle:moodle:*:*:*:*:*:*:*:*
Vendors & Products Moodle
Moodle moodle
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
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.
Weaknesses CWE-384
References
Metrics cvssV3_1

{'score': 4.2, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:N'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
mitre
Published
Updated
Jun 24, 2025, 7:46 PM
Reserved
Jun 24, 2025, 12:00 AM
Status
Analyzed
Published
Jun 24, 2025, 8:15 PM
Modified
Jun 17, 2026, 9:37 AM