CVE-2026-13707
Received Received - Intake

Session Fixation in Wikimedia OAuth

Publication date: 2026-07-01

Last updated on: 2026-07-01

Assigner: wikimedia-foundation

Description
Session fixation vulnerability in Wikimedia Foundation OAuth. This vulnerability is associated with program files src/Backend/MWOAuthServer.Php. This issue affects OAuth: from * through 1.46.0, 1.45.4, 1.44.6, 1.43.9.

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Meta Information

Published
2026-07-01
Last Modified
2026-07-01
Generated
2026-07-01
AI Q&A
2026-07-01
EPSS Evaluated
N/A
NVD
CVE-2026-13707
EUVD
EUVD-2026-41033

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
wikimedia_foundation oauth to 1.46.0 (inc)

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Exploitability

CWE
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KEV
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CWE ID Description
CWE-384 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.

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Executive Summary

This vulnerability is a session fixation issue found in the Wikimedia Foundation OAuth implementation. It affects certain versions of the OAuth program files, specifically src/Backend/MWOAuthServer.Php. Session fixation vulnerabilities allow an attacker to fixate a user's session ID before the user logs in, potentially enabling the attacker to hijack the user's authenticated session.

Impact Analysis

The session fixation vulnerability can allow an attacker to hijack a user's session by forcing a known session ID. This can lead to unauthorized access to the user's account or actions performed on their behalf, compromising the security and privacy of the affected user.

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