[ CVE-2026-100377 · Published 25 Sep 2026 ]

Vulnerability in Wikimedia Foundation Mediawiki - WikiLambda Extension

CVSS 6.9 EPSS <1%1 agency advisoryNo fix listed yet

[ Description ]Official description

Exposure of Sensitive Information to an Unauthorized Actor vulnerability in Wikimedia Foundation Mediawiki - WikiLambda Extension allows Excavation. This issue affects Mediawiki - WikiLambda Extension: 1.47.0-alpha. The issue has been remediated on the `master` branch.

[ 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-2026-100377
EUVD: EUVD-2026-87358
Published: 25 Sep 2026, 21:17 UTC
Updated: 28 Sep 2026, 16:38 UTC
NVD status: Awaiting Analysis
CVSS 4.0: 6.9 Medium
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/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: 0.32% chance of exploitation in 30 days · higher than 24% of CVEs
CISA SSVC: Exploitation: none · Automatable: yes · Impact: partial
Weakness: CWE-200

[ Affected ]Affected products

Wikimedia Foundation Mediawiki - WikiLambda Extension1.47.0-alpha

[ Description ]Official description

[ Fixes ]Fixes and patches

[ Advisories ]Government CERT advisories

MediaWiki Extensions: Multiple vulnerabilities Translated from German

[ References ]References