High severity · published Jul 1, 2026
CVE-2026-13707
Session fixation attacks on improperly configured OAuth 1.0a tools
7.6
CVSS
0.3%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:L
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
Required
Confidentiality
High
Integrity
High
Availability
Low
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 28% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
OA
OAuth · Wikimedia Foundation
through 1.46.0, 1.45.4, 1.44.6, 1.43.9 · source: vendor
ME
Mediawiki · Mediawiki
1.43.0 before 1.43.9; 1.44.0 before 1.44.6; 1.45.0 before 1.45.4; 1.46.0 · source: NVD