Exposure of Sensitive Information to an Unauthorized Actor vulnerability in Wikimedia Foundation MediaWiki. (CVE-2026-58026)
Description
A vulnerability in Wikimedia Foundation MediaWiki allows exposure of sensitive information to unauthorized actors. It affects multiple versions of MediaWiki prior to 1.46.0, including specific versions such as 1.45.4, 1.44.6, and 1.43.9. The issue is related to the program file includes/Parser/Parser.Php. The vulnerability has a medium severity with a CVSS score of 5.7.
CVSS v3.1
Score 5.7medium
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-2026-58026 describes an exposure of sensitive information vulnerability in MediaWiki, specifically linked to the includes/Parser/Parser.Php file. This vulnerability affects MediaWiki versions before 1.46.0, including 1.45.4, 1.44.6, and 1.43.9, as well as multiple other versions explicitly listed. The CVSS 3.1 base score is 5.7, indicating a medium severity issue with network attack vector, low attack complexity, requiring privileges and user interaction, and resulting in high confidentiality impact without integrity or availability impact.
Potential Impact
The vulnerability allows unauthorized actors to gain access to sensitive information within affected MediaWiki installations. The confidentiality impact is high, but there is no impact on integrity or availability. Exploitation requires low complexity, privileges, and user interaction.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. No official fix or patch links are provided in the available data. Users should monitor official MediaWiki advisories for updates and apply patches once available.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- UBUNTU-CVE-2026-58026
- 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: 6ad3f5df2cdf04f656663480
Added to database: 10/17/2026, 22:25:35 UTC
Last enriched: 10/18/2026, 00:33:54 UTC
Last updated: 10/18/2026, 00:33:54 UTC
Views: 2
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