Semantic MediaWiki has reflected XSS in Special:Ask plain table headers (CVE-2026-77606) | HOL Guard CVE

Medium · CVSS 6.1CVE-2026-77606GHSA-3JP5-3H47-28QF

Semantic MediaWiki has reflected XSS in Special:Ask plain table headers

Answer in brief

CVE-2026-77606 records a Medium severity (CVSS 6.1) vulnerability in Semantic MediaWiki has reflected XSS in Special:Ask plain table headers. The current sources do not mark it as known exploited. The current feed maps mediawiki/semantic-media-wiki (composer), SemanticMediaWiki/SemanticMediaWiki (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 18, 2026Updated Sep 18, 2026Source checked Sep 18, 2026First seen by HOL Sep 18, 2026Material review Sep 18, 2026

Upstream Advisory

Key facts

Risk: Medium · CVSS 6.1
Exploitation: Not marked as known exploited
Affected software: 2 mapped packages or products
Fix availability: Available

Why this deserves its current priority

CVSS is 6.1. 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 mediawiki/semantic-media-wiki (composer), SemanticMediaWiki/SemanticMediaWiki (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
mediawiki/semantic-media-wikicomposer	<=7.1.0	7.2.0
SemanticMediaWiki/SemanticMediaWikigeneric	< 7.2.0	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for mediawiki/semantic-media-wiki, SemanticMediaWiki/SemanticMediaWiki.
Review the reported fix. Update mediawiki/semantic-media-wiki to 7.2.0 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Sep 18, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Sep 18, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Sep 18, 2026

Sources and claim methodology

Upstream source description

Semantic MediaWiki is a free, open-source extension to MediaWiki that lets users store and query data within the wiki's pages. Prior to version 7.2.0, when `headers=plain`, table header text was emitted into `<th>` via a raw HTML path. User-controlled `mainlabel` content could therefore become executable HTML. Version 7.2.0 fixes the issue.

Quoted source text, attributed separately from HOL analysis.