Exposure of Sensitive Information to an Unauthorized Actor vulnerability in Wikimedia Foundation MediaWiki. (CVE-2026-58033)
Description
A vulnerability in Wikimedia Foundation MediaWiki allows exposure of sensitive information to unauthorized actors. It affects multiple versions prior to 1.46.0, including 1.45.4, 1.44.6, and 1.43.9. The issue is related to the program file includes/Actions/InfoAction.Php. The vulnerability has a medium severity with a CVSS score of 6.5.
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-2026-58033 is a vulnerability in MediaWiki that leads to exposure of sensitive information to unauthorized actors. The flaw is located in the includes/Actions/InfoAction.Php file. Affected versions include all versions before 1.46.0, specifically 1.45.4, 1.44.6, and 1.43.9, as well as multiple specific package versions listed. The vulnerability has a CVSS 3.1 base score of 6.5, indicating a medium severity with network attack vector, low attack complexity, no privileges required, user interaction required, and high confidentiality impact without integrity or availability impact.
Potential Impact
An attacker can gain access to sensitive information without authorization, potentially compromising confidentiality. There is no impact on integrity or availability. The vulnerability can be exploited remotely over the network with low complexity but requires user interaction.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Since no explicit patch or official fix information is provided, users should monitor the Wikimedia Foundation's advisories for updates and apply patches once available.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- UBUNTU-CVE-2026-58033
- 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: 6ad3f5de2cdf04f656663479
Added to database: 10/17/2026, 22:25:34 UTC
Last enriched: 10/18/2026, 00:33:22 UTC
Last updated: 10/18/2026, 00:33:22 UTC
Views: 2
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