CVE-2025-6596 Vector inserts portlet labels as HTML, allowing for stored XSS through system messages
Attackers can inject malicious scripts via portlet labels in the Vector skin, potentially stealing user sessions or executing code.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2025-6596?
CVE-2025-6596 is a cross-site scripting vulnerability in Wikimedia Foundation Vector, published on 2 Feb 2026. An attacker needs administrator access to exploit it, and only if a user opens a file or follows a link.
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.
Weakness: CWE-79
Which versions are affected by CVE-2025-6596?
How do I fix CVE-2025-6596?
Upgrade to a fixed version.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2025-6596 being exploited?
There is no known exploitation of CVE-2025-6596 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2025-6596, GHSA-r8cg-vqg3-34j4, UBUNTU-CVE-2025-6596.