What is CVE-2026-116879?

CVE-2026-116879 is a medium-severity vulnerability in Semanticmediawiki, classified under Missing Authorization. CVSS score: 5.4/10. Published 2026-10-27.

How severe is CVE-2026-116879?

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

Auth bypass in Semanticmediawiki

CVE-2026-116879

Semantic MediaWiki from 7.3.0 before 7.3.1 contains a missing authorization vulnerability in the smwtask update task that allows users with edit rights to force semantic updates on arbitrary pages. Attackers can supply a serialized subject parameter for a restricted page to trigger forced reparsing, semantic-store writes, and resource-intensive dependency work.

Vulnerability class: Broken Access Control

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:N/S:U/C:N/I:L/A:L.

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-862 — Missing Authorization

References

github.com/SemanticMediaWiki/SemanticMediaWiki/security/advisories/GHSA-6wrc-86… (vendor-advisory)
github.com/SemanticMediaWiki/SemanticMediaWiki/commit/cba0541d1f931e5c5440a4837… (patch)
www.vulncheck.com/advisories/semantic-mediawiki-7.3.0-before-7.3.1-missing-auth… (third-party-advisory)

Frequently asked questions

What is CVE-2026-116879?: CVE-2026-116879 is a medium-severity vulnerability in Semanticmediawiki, classified under Missing Authorization. CVSS score: 5.4/10. Published 2026-10-27.
How severe is CVE-2026-116879?: Medium severity. CVSS v3 base score is 5.4 out of 10.