Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting') vulnerability in Wikimedia Foundation MediaWiki. (CVE-2026-58037)
Description
A Cross-site Scripting (XSS) vulnerability exists in Wikimedia Foundation MediaWiki affecting multiple program files related to language and logging components. This vulnerability allows improper neutralization of input during web page generation. It affects MediaWiki versions prior to 1.46.0, including specific older versions such as 1.45.4, 1.44.6, and 1.43.9. The vulnerability has a medium severity with a CVSS score of 6.1.
CVSS v3.1
Score 6.1medium
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-2026-58037 is an XSS vulnerability in MediaWiki caused by improper neutralization of input during web page generation. The affected components include several PHP files related to language processing and logging (includes/Language/Language.Php, includes/Logging/BlockLogFormatter.Php, includes/Logging/LogFormatter.Php, includes/Logging/PatrolLogFormatter.Php, includes/Logging/RenameuserLogFormatter.Php, includes/Logging/TagLogFormatter.Php, includes/Specials/SpecialVersion.Php). This vulnerability affects MediaWiki versions before 1.46.0, including specific older versions. The CVSS 3.1 vector indicates network attack vector, low attack complexity, no privileges required, user interaction required, scope changed, and low confidentiality and integrity impact with no availability impact.
Potential Impact
Successful exploitation of this vulnerability could allow an attacker to execute arbitrary scripts in the context of the affected MediaWiki web application, potentially leading to limited confidentiality and integrity impacts. There is no indication of availability impact. The vulnerability requires user interaction and can be exploited remotely without privileges.
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 official MediaWiki advisories for updates and apply patches once available. Until then, consider applying any recommended temporary mitigations from the vendor.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- UBUNTU-CVE-2026-58037
- 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: 6ad3f5de2cdf04f656663476
Added to database: 10/17/2026, 22:25:34 UTC
Last enriched: 10/18/2026, 00:33:02 UTC
Last updated: 10/18/2026, 00:33:02 UTC
Views: 2
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