What is CVE-2026-116881?

CVE-2026-116881 is a medium-severity vulnerability in Semanticmediawiki, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2026-10-27.

How severe is CVE-2026-116881?

Medium severity. CVSS v3 base score is 6.1 out of 10.

XSS in Semanticmediawiki

CVE-2026-116881

Semantic MediaWiki from 3.0.0 before 7.3.1 contains a cross-site scripting vulnerability that allows attackers to inject markup by storing malicious semantic property values rendered unescaped in autocomplete suggestions. When another user opens the property-value autocomplete with an empty query, jquery.autocomplete.js concatenates the raw PValueLookup API value into HTML via container.html(), altering the dropdown and potentially executing script.

Vulnerability class: XSS (Cross-Site Scripting)

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

CVSS v3 metric

CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/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-mvpf-4w… (vendor-advisory)
www.vulncheck.com/advisories/semantic-mediawiki-3.0.0-before-7.3.1-xss-via-prop… (third-party-advisory)

Frequently asked questions

What is CVE-2026-116881?: CVE-2026-116881 is a medium-severity vulnerability in Semanticmediawiki, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2026-10-27.
How severe is CVE-2026-116881?: Medium severity. CVSS v3 base score is 6.1 out of 10.