Stored XSS on Wikibase Special:SetSiteLink via unescaped system message (CVE-2026-100245) | HOL Guard CVE

Unknown severity · Source severity not reportedCVE-2026-100245

Stored XSS on Wikibase Special:SetSiteLink via unescaped system message

Answer in brief

CVE-2026-100245 records a Unknown severity vulnerability in Stored XSS on Wikibase Special:SetSiteLink via unescaped system message. The current sources do not mark it as known exploited. The current feed maps Wikimedia Foundation/Mediawiki - Wikibase Extension (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Sep 29, 2026Updated Sep 29, 2026Source checked Sep 29, 2026First seen by HOL Sep 29, 2026Material review Sep 29, 2026

Upstream Advisory

Key facts

Risk: Unknown severitySource severity not reported
Exploitation: Not marked as known exploited
Affected software: 1 mapped package or product
Fix availability: Available

Why this deserves its current priority

A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Wikimedia Foundation/Mediawiki - Wikibase Extension (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
Wikimedia Foundation/Mediawiki - Wikibase Extensiongeneric	>=* <1.46.1 1.45.5 1.43.10	1.46.1, 1.45.5, 1.43.10, 1.46.1

Recommended response

Check inventory. Check lockfiles and deployed manifests for Wikimedia Foundation/Mediawiki - Wikibase Extension.
Review the reported fix. Update Wikimedia Foundation/Mediawiki - Wikibase Extension to 1.46.1, 1.45.5, 1.43.10 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Sep 29, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Sep 29, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Sep 29, 2026

Sources and claim methodology

Upstream source description

Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting') vulnerability in Wikimedia Foundation Mediawiki - Wikibase Extension allows Stored XSS. This issue affects Mediawiki - Wikibase Extension: from * before 1.46.1, 1.45.5, 1.43.10.

Quoted source text, attributed separately from HOL analysis.