[ CVE-2026-100380 · Published 25 Sep 2026 ]

Vulnerability in Wikimedia Foundation Mediawiki - Wikibase Extension

CVSS 5.3 EPSS <1%1 agency advisoryNo fix listed yet

[ Description ]Official description

Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting') vulnerability in Wikimedia Foundation Mediawiki - Wikibase Extension allows Cross-Site Scripting (XSS). This issue affects Mediawiki - Wikibase Extension: from * before 1.46.1, 1.45.5, 1.43.10.

[ Fixes ]Fixes and patches

No fix or interim patch is linked from our sources yet. Check the vendor references below and limit exposure of affected systems until a fix is available.

[ Advisories ]Government CERT advisories

BSI CERT-Bund27 Sep 2026WID-SEC-2026-3597

MediaWiki Extensions: Multiple vulnerabilities Translated from German
CVE-2026-57440CVE-2026-96875CVE-2026-100237+11 more CVEs

[ References ]References

[ Facts ]Key facts

CVE: CVE-2026-100380
EUVD: EUVD-2026-87345
Published: 25 Sep 2026, 21:17 UTC
Updated: 28 Sep 2026, 16:38 UTC
NVD status: Awaiting Analysis
CVSS 4.0: 5.3 Medium
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Scored by c4f26cc8-17ff-4c99-b5e2-38fc1793eacc
EPSS: 0.33% chance of exploitation in 30 days · higher than 25% of CVEs
CISA SSVC: Exploitation: none · Automatable: no · Impact: partial
Weakness: CWE-79

[ Affected ]Affected products

Wikimedia Foundation Mediawiki - Wikibase Extension< 1.46.1, 1.45.5, 1.43.10

[ Description ]Official description

[ Fixes ]Fixes and patches

[ Advisories ]Government CERT advisories

MediaWiki Extensions: Multiple vulnerabilities Translated from German

[ References ]References