What is CVE-2026-116886?

CVE-2026-116886 is a medium-severity vulnerability in Semanticmediawiki, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2026-10-27.

How severe is CVE-2026-116886?

Medium severity. CVSS v3 base score is 5.4 out of 10.

XSS in Semanticmediawiki

CVE-2026-116886

Semantic MediaWiki from 2.5.0 before 7.3.1 contains a stored cross-site scripting vulnerability that allows users with page-edit rights to inject scripts via External identifier property values. Attackers can annotate markup payloads that ExternalIdentifierValue renders unescaped on Special:Browse, executing JavaScript in viewers' sessions, including administrators.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2026-10-27 · last modified 2026-10-27.

CVSS v3 metric

CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N.

EPSS exploit prediction

No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.

Affected products

Semanticmediawiki

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

github.com/SemanticMediaWiki/SemanticMediaWiki/security/advisories/GHSA-2gfw-3h… (vendor-advisory)
www.vulncheck.com/advisories/semantic-mediawiki-before-7.3.1-stored-xss-via-ext… (third-party-advisory)

Frequently asked questions

What is CVE-2026-116886?: CVE-2026-116886 is a medium-severity vulnerability in Semanticmediawiki, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2026-10-27.
How severe is CVE-2026-116886?: Medium severity. CVSS v3 base score is 5.4 out of 10.