This vulnerability (CVE-2026-58028) in Wikimedia Foundation's MediaWiki and CentralAuth arises from improper input neutralization during web page generation, leading to cross-site scripting (CWE-79). It affects multiple source files responsible for API formatting, help content, resource loading, page display hooks, and log formatting. The affected versions include all releases before 1.46.0 and specifically 1.45.4, 1.44.6, and 1.43.9. The CVSS 4.0 vector indicates network attack vector, low attack complexity, no privileges or user interaction required, and no confidentiality, integrity, or availability impact, but the CVSS score is 0, suggesting incomplete scoring or no direct impact quantified. No patch or official remediation level has been published yet.

The vulnerability allows cross-site scripting attacks due to improper input neutralization in MediaWiki and CentralAuth components. This could enable attackers to execute arbitrary scripts in the context of affected web pages, potentially leading to session hijacking, defacement, or other client-side impacts. However, the provided CVSS vector indicates no direct impact on confidentiality, integrity, or availability, and no privileges or user interaction are required for exploitation. No known exploits are reported in the wild at this time.

Patch status is not yet confirmed — check the Wikimedia Foundation vendor advisory for current remediation guidance. Until an official fix is released, administrators should monitor official channels for updates. No vendor-provided temporary fixes or workarounds are currently documented.