Vulnerability · Published Feb 2, 2026 · Assigned by wikimedia-foundation

CVE-2025-6596Vector inserts portlet labels as HTML, allowing for stored XSS through system messages

None 0.0

In plain English

A cross-site scripting in Vector from Wikimedia Foundation. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 38% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 4.0)0.0None

Exploit odds (30 days)0.4%top 62.3% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting') vulnerability in Wikimedia Foundation Vector. This vulnerability is associated with program files resources/skins.Vector.Js/portlets.Js, resources/skins.Vector.Legacy.Js/portlets.Js. This issue affects Vector: from >= 1.40.0 before 1.42.7, 1.43.2, 1.44.0.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
Debian:13	mediawiki	1:1.43.3+dfsg-1	DEBIAN-CVE-2025-6596
Debian:14	mediawiki	1:1.43.3+dfsg-1	DEBIAN-CVE-2025-6596
Ubuntu:25.10	mediawiki	no fix listed	UBUNTU-CVE-2025-6596
Ubuntu:26.04:LTS	mediawiki	no fix listed	UBUNTU-CVE-2025-6596
Ubuntu:26.10	mediawiki	no fix listed	UBUNTU-CVE-2025-6596

Affected products (as reported)

Vendor	Product	Versions
Wikimedia Foundation	Vector	>= 1.40.0 – before 1.42.7, 1.43.2, 1.44.0

Weakness: CWE-79 · Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:P/VC:N/VI:N/VA:N/SC:N/SI:N/SA:N

References

https://phabricator.wikimedia.org/T396685