Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting') vulnerability in Wikimedia Foundation MediaWiki. (CVE-2026-58035)
Description
A Cross-site Scripting (XSS) vulnerability exists in Wikimedia Foundation MediaWiki, specifically in the program files related to resources/src/mediawiki.Special.Block/SpecialBlock.Vue. This vulnerability involves improper neutralization of input during web page generation, which can lead to partial compromise of confidentiality and integrity. The issue affects multiple specific versions of MediaWiki. The CVSS score is 4.8, indicating a medium severity level.
CVSS v3.1
Score 4.8medium
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-2026-58035 is an XSS vulnerability in Wikimedia Foundation MediaWiki caused by improper neutralization of input during web page generation. The vulnerability is located in the resources/src/mediawiki.Special.Block/SpecialBlock.Vue component. It allows an attacker with high privileges and requiring user interaction to potentially compromise confidentiality and integrity of the affected system. The vulnerability affects numerous specific MediaWiki package versions as listed, with no known exploits in the wild and no cloud service involvement.
Potential Impact
The vulnerability allows an attacker with high privileges and requiring user interaction to perform cross-site scripting attacks that can lead to partial confidentiality and integrity compromise. There is no impact on availability. No known exploits are currently reported in the wild.
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 vendor advisories for updates and apply patches once available. Since this vulnerability requires high privileges and user interaction, limiting user privileges and cautious handling of user inputs may reduce risk temporarily.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- UBUNTU-CVE-2026-58035
- 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: 6ad3f5de2cdf04f656663478
Added to database: 10/17/2026, 22:25:34 UTC
Last enriched: 10/18/2026, 00:33:12 UTC
Last updated: 10/18/2026, 00:33:12 UTC
Views: 2
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