vulnerability
Moodle: Session Fixation (CVE-2025-53021)
| Severity | CVSS | Published | Added | Modified |
|---|---|---|---|---|
| 4 | (AV:N/AC:H/Au:N/C:P/I:P/A:N) | Jun 24, 2025 | Jul 11, 2025 | Feb 15, 2026 |
Severity
4
CVSS
(AV:N/AC:H/Au:N/C:P/I:P/A:N)
Published
Jun 24, 2025
Added
Jul 11, 2025
Modified
Feb 15, 2026
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.
Solution
moodle-upgrade-latest
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