CVE-2026-13707 PUBLISHED

Session fixation attacks on improperly configured OAuth 1.0a tools

Assigner: wikimedia-foundation
Reserved: 29.06.2026 Published: 01.07.2026 Updated: 01.07.2026

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.

CVSS Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:N/SI:N/SA:N
CVSS Score: 0

Exploitability Metrics		Vulnerable System Impact Metrics		Subsequent System Impact Metrics
Attack Vector	Network	Confidentiality	None	Confidentiality	None
Attack Complexity	Low	Integrity	None	Integrity	None
Attack Requirements	None	Availability	None	Availability	None
Privileges Required	Low
User Interaction	Passive

CVSS 4.0

Vendor	Wikimedia Foundation
Product	OAuth
Versions	Default: unaffected affected from * to 1.46.0, 1.45.4, 1.44.6, 1.43.9 (incl.)