Semantic MediaWiki affected by Special:Ask table `sep` parameter reflected XSS

published 2026-09-18 51 d ago modified 2026-09-23 46 d ago also GHSA-7xv3-gf2g-498h , EUVD-2026-83181

cvss: 6.1; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.3%; EPSS 0.3% chance of exploitation in 30 days, percentile 20%
public exploits: 0; none known

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, `sep` was inserted verbatim into HTML cell joins. This made it possible to inject HTML through the separator value. Version 7.2.0 fixes the issue.

Patch / fix

fixed in 1 links 1

packagist mediawiki/semantic-media-wiki 7.2.0

github.com/SemanticMediaWiki/SemanticMediaWiki/releases/tag/7.2.0 release

CISA SSVC

Exploitation: none
Automatable: no
Technical impact: partial
Assessed: 51 d ago (2026-09-18)

Exploit prediction

0.28% chance of exploitation in the next 30 days, higher than 20% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CNA	3.1	6.1	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
GitHub	3.1	6.1	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Affected packages

ecosystem	package	affected	fixed in
packagist	mediawiki/semantic-media-wiki	<7.2.0	7.2.0

Affected products

SemanticMediaWiki SemanticMediaWiki

Classification

Weakness

CWE-79 Improper Neutralization of Input During Web Page Generation

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary