CVE-2025-53021

MEDIUM

4.2

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.

CVE Details

CVSS v3.1 Score4.2

SeverityMEDIUM

CVSS VectorCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:N

Attack VectorNETWORK

ComplexityHIGH

Privileges RequiredNONE

User InteractionREQUIRED

Published6/24/2025

Last Modified7/9/2025

Sourcenvd

Honeypot Sightings0

Affected Products

moodle:moodle

Weaknesses (CWE)

CWE-384

References

https://github.com/moodle/moodle/releases/tag/v3.11.18(cve@mitre.org)

https://moodledev.io/general/releases#moodle-311(cve@mitre.org)

https://rentry.co/moodle-oauth2-cve(cve@mitre.org)

IOC Correlations

No correlations recorded

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