Vulnerability in Wikimedia Foundation MediaWiki. (CVE-2026-58029)
Description
A medium severity vulnerability (CVE-2026-58029) affects Wikimedia Foundation MediaWiki versions prior to 1.46.0 and specific earlier versions including 1.45.4, 1.44.6, and 1.43.9. The issue involves several API and special page PHP files related to authentication data and account linking/unlinking. The vulnerability has a CVSS 3.1 base score of 6.5, indicating a network attack vector with low complexity and no privileges or user interaction required, impacting confidentiality and integrity but not availability.
CVSS v3.1
Score 6.5medium
Affected software
pkg:deb/ubuntu/mediawiki?arch=source&distro=bionicpkg:deb/ubuntu/mediawiki?arch=source&distro=esm-apps/focalpkg:deb/ubuntu/mediawiki?arch=source&distro=esm-apps/jammypkg:deb/ubuntu/mediawiki?arch=source&distro=esm-apps/noblepkg:deb/ubuntu/mediawiki?arch=source&distro=questingpkg:deb/ubuntu/mediawiki?arch=source&distro=stonkingpkg:deb/ubuntu/mediawiki?arch=source&distro=resoluteRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-58029 is a vulnerability in MediaWiki affecting multiple program files related to authentication data management and account linking/unlinking (includes/Api/ApiChangeAuthenticationData.Php, ApiLinkAccount.Php, ApiRemoveAuthenticationData.Php, Specials/SpecialLinkAccounts.Php, SpecialUnlinkAccounts.Php). It impacts versions from all prior to 1.46.0, including 1.45.4, 1.44.6, and 1.43.9. The CVSS 3.1 score of 6.5 reflects a network exploitable flaw with low attack complexity, no privileges required, and no user interaction, resulting in limited confidentiality and integrity impact without affecting availability. No known exploits in the wild have been reported. The vulnerability is not in a cloud service and no vendor advisory or patch links were provided in the data.
Potential Impact
The vulnerability allows an attacker to potentially impact confidentiality and integrity of MediaWiki authentication data or account linking features remotely without authentication or user interaction. Availability is not affected. The medium severity score reflects moderate risk but no active exploitation has been reported.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Since no official patch or vendor advisory was provided, users should monitor Wikimedia Foundation security announcements for updates and apply any official fixes once available. Until then, consider restricting network access to the affected API endpoints if feasible.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- UBUNTU-CVE-2026-58029
- Osv Schema Version
- 1.7.0
- Ecosystems
- ["Ubuntu:18.04:LTS","Ubuntu:Pro:20.04:LTS","Ubuntu:Pro:22.04:LTS","Ubuntu:Pro:24.04:LTS","Ubuntu:25.10","Ubuntu:26.10","Ubuntu:26.04:LTS"]
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 6ad3f5df2cdf04f65666347d
Added to database: 10/17/2026, 22:25:35 UTC
Last enriched: 10/18/2026, 00:33:38 UTC
Last updated: 10/18/2026, 00:33:38 UTC
Views: 2
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