SecuriTricks - CVE-2025-53021

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.

Product(s) Impacted

Vendor	Product	Versions
Moodle	Moodle	3.0-3.11.18

Weaknesses

Common security weaknesses mapped to this vulnerability.

CWE-384

Session Fixation

Authenticating a user, or otherwise establishing a new user session, without invalidating any existing session identifier gives an attacker the opportunity to steal authenticated sessions.

*CPE(s)

Affected systems and software identified for this CVE.

Type	Vendor	Product	Version	Update	Edition	Language	Software Edition	Target Software	Target Hardware	Other Information
a	moodle	moodle	3.0-3.11.18	/	/	/	/	/	/	/

References

https://github.com/moodle/moodle/releases/tag/v3.11.18

https://moodledev.io/general/releases#moodle-311

https://rentry.co/moodle-oauth2-cve

CVSS Score

4.2 / 10

CVSS Data - 3.1

Attack Vector: NETWORK
Attack Complexity: HIGH
Privileges Required: NONE
Scope: UNCHANGED
Confidentiality Impact: LOW
Integrity Impact: LOW
Availability Impact: NONE

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

View Vector String

Timeline

Published: June 24, 2025, 8:15 p.m.
Last Modified: June 24, 2025, 8:15 p.m.

Status : Received

CVE has been recently published to the CVE List and has been received by the NVD.

More info

Source

cve@mitre.org

CVE-2025-53021