GitHub Advisoryadvisory · Packagist

GHSA-7xv3-gf2g-498h Semantic MediaWiki affected by Special:Ask table `sep` parameter reflected XSS

MEDIUM Published 2026-09-18 Modified 2026-09-18 Official page ↗
Aliases
CVE-2026-77607
Ecosystem
Packagist
Packages
mediawiki/semantic-media-wiki
Severity
Moderate
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Weaknesses
CWE-79
Reviewed
2026-09-18

Affected packages

• Packagist mediawiki/semantic-media-wiki: < 7.2.0 → fixed in 7.2.0

Description

Failure mode `sep` was inserted verbatim into the HTML that joins a table cell's values. This made it possible to inject HTML through the separator value. The same unsanitised table HTML is produced both for the standard `Special:Ask` render and for its raw request output (`request_type=raw`), so the injection was reachable without authentication. Remediation • In all non-wiki output modes (HTML, raw request, file), `sep` is escaped unless it is a safe `` variant. • This preserves legitimate line-break separators while blocking markup injection. Maintenance note If the table renderer ever gains richer separator semantics, keep the whitelist explicit. Do not expand the allowed HTML surface casually.

Related

Alias · CVE (1)

  • CVE-2026-77607 Semantic MediaWiki is a free, open-source extension to MediaWiki that lets users store and query data within the wiki's pages. vulnerability

Weakness · CWE (1)

  • CWE-79 Improper Neutralization of Input During Web Page Generation weakness

References