[ CVE-2026-103438 · Published 30 Sep 2026 ]

Vulnerability in The Wikimedia Foundation MediaWiki Wikistories extension

CVSS 0.3 EPSS <1%1 agency advisoryNo fix listed yet

[ Description ]Official description

Improper neutralization of Script-Related HTML tags in a web page (basic XSS) vulnerability in The Wikimedia Foundation MediaWiki Wikistories extension allows Cross-Site Scripting (XSS). This issue affects MediaWiki Wikistories extension: 1.46, 1.45, and 1.43.

[ 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-Bund30 Sep 2026WID-SEC-2026-3693

MediaWiki Extensions: Multiple vulnerabilities Translated from German
CVE-2026-103446CVE-2026-103445CVE-2026-103444+9 more CVEs

[ References ]References

[ Facts ]Key facts

CVE: CVE-2026-103438
EUVD: EUVD-2026-90210
Published: 30 Sep 2026, 18:18 UTC
Updated: 30 Sep 2026, 21:17 UTC
NVD status: Awaiting Analysis
CVSS 4.0: 0.3 Low
CVSS:4.0/AV:L/AC:H/AT:P/PR:H/UI:P/VC:L/VI:L/VA:L/SC:L/SI:L/SA:L/E:P/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:N/AU:Y/R:U/V:D/RE:M/U:Amber
Scored by c4f26cc8-17ff-4c99-b5e2-38fc1793eacc
EPSS: 0.11% chance of exploitation in 30 days · higher than 1% of CVEs
CISA SSVC: Exploitation: none · Automatable: no · Impact: partial
Weakness: CWE-80

[ Affected ]Affected products

The Wikimedia Foundation MediaWiki Wikistories extension1.46, 1.45, 1.43

[ Description ]Official description

[ Fixes ]Fixes and patches

[ Advisories ]Government CERT advisories

MediaWiki Extensions: Multiple vulnerabilities Translated from German

[ References ]References