CVE-2025-53021

MEDIUM EPSS 17.4%
Published Jun 24, 20251y ago · Modified Jun 17, 20261w ago
4.2 CVSS 3.1
Medium
Find Similar
Published Jun 24, 2025 1y ago
Last Modified Jun 17, 2026 1w ago

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.

CVSS Details

Base Score
4.2
Exploitability
1.6
Impact
2.5
Vector string
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:N
Attack Vector Network
Attack Complexity High
Privileges Required None
User Interaction Required
Scope Unchanged
Confidentiality Low
Integrity Low
Availability None

Threat Intelligence

EPSS Exploit Probability
17.4% percentile
Exploit & Patch Status
No Known Exploit
No Patch Available

Weaknesses 1

CWE-384

Affected Products 1

VendorProductVersionRange
moodlemoodle*≥3.0.0  –  ≤3.11.18

References 3

  • github.com https://github.com/moodle/moodle/releases/tag/v3.11.18
    Product
  • moodledev.io https://moodledev.io/general/releases#moodle-311
    Product
  • rentry.co https://rentry.co/moodle-oauth2-cve
    Third Party Advisory

Remediation

No remediation data recorded yet

Check vendor advisories and the NVD entry for patch availability.