CVE catalog
CVE-2025-53021
UBUNTU-CVE-2025-53021
- Severity
- Medium · CVSS 4.2
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:N - Published
- Updated
- Source
- [NVD] · [CVE record]
- EPSS
- 0.33% · Oct 25, 2026
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.
Vulnerable and fixed packages
Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.
| Distribution | Package | Release | Version | Status |
|---|---|---|---|---|
| Ubuntu | moodle | pro | 2.7.9+dfsg-1 | vulnerable |
| Ubuntu | moodle | pro | 2.7.10+dfsg-1 | vulnerable |
| Ubuntu | moodle | pro | 2.7.11+dfsg-1 | vulnerable |
| Ubuntu | moodle | pro | 2.7.11+dfsg-2 | vulnerable |
| Ubuntu | moodle | pro | 2.7.12+dfsg-1 | vulnerable |
| Ubuntu | moodle | pro | 3.0.3+dfsg-0ubuntu1 | vulnerable |
| Ubuntu | moodle | pro | 3.0.3+dfsg-0ubuntu1+esm1 | vulnerable |
| Ubuntu | moodle | pro | 3.0.3+dfsg-0ubuntu1 | vulnerable |
| Ubuntu | moodle | pro | 3.0.3+dfsg-0ubuntu1+esm1 | vulnerable |
Fixed-version evidence
OpenFactory catalog packages
No matching packages in this catalog.
Observed: