EUVD-2026-41029
GHSA-jqc3-4vrw-8965
Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:N/SC:N/SI:N/SA:N
Network-delivered stored XSS requiring authenticated editor (PR:L), victim page load (UI:R), scope change to browser (S:C), with low confidentiality and integrity impact.
Primary rating from Vendor (wikimedia-foundation).
CVSS VectorVendor: wikimedia-foundation
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:N/SC:N/SI:N/SA:N
Lifecycle Timeline
2DescriptionCVE.org
Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting') vulnerability in Wikimedia Foundation MediaWiki, Wikimedia Foundation CentralAuth.
This vulnerability is associated with program files includes/Api/ApiFormatBase.Php, includes/Api/ApiHelp.Php, includes/ResourceLoader/Module.Php, includes/Hooks/Handlers/PageDisplayHookHandler.Php, includes/LogFormatter/PermissionChangeLogFormatter.Php.
This issue affects MediaWiki: from * before 1.46.0, 1.45.4, 1.44.6, 1.43.9; CentralAuth: from * before 1.46.0, 1.45.4, 1.44.6, 1.43.9.
AnalysisAI
Cross-site scripting in Wikimedia Foundation MediaWiki and the CentralAuth extension allows authenticated low-privileged users to inject malicious scripts into rendered wiki pages or API output through unsanitized input in API formatting, ResourceLoader module handling, page display hooks, and permission change log formatting. Affected versions span all releases of both products prior to the 1.46.0, 1.45.4, 1.44.6, and 1.43.9 patch series. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires a low-privileged authenticated account on the target MediaWiki installation (consistent with CVSS PR:L). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The provided CVSS 4.0 vector (AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:N/SC:N/SI:N/SA:N) contains a critical inconsistency: all impact metrics are set to None, which is incompatible with any meaningful XSS vulnerability. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An authenticated wiki editor with standard editing privileges submits a wiki page, permission change reason, or API-formatted content containing a crafted JavaScript payload that is not properly escaped by one of the five affected rendering paths - for example, a maliciously formatted group-change reason in CentralAuth's PermissionChangeLogFormatter. When a wiki administrator or another logged-in user navigates to the log page or API help endpoint, the payload executes in their browser session, potentially stealing session cookies or performing authenticated actions on their behalf. … |
| Remediation | Upgrade MediaWiki and the CentralAuth extension to one of the patched releases: 1.43.9, 1.44.6, 1.45.4, or 1.46.0 - select the branch matching your current deployment series. … Detailed patch versions, workarounds, and compensating controls in full report. |
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External POC / Exploit Code
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