CVE-2025-62659 The CookieConsent extension does not properly use reserved data attributes, thus introducing potential XSS vectors
An attacker can inject malicious scripts via reserved data attributes in the MediaWiki CookieConsent extension, potentially executing code in user browsers.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2025-62659?
CVE-2025-62659 is a low-severity cross-site scripting vulnerability in The Wikimedia Foundation MediaWiki CookieConsent extension, published on 22 Oct 2025. Any signed-in user can exploit it over the network, 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 The Wikimedia Foundation MediaWiki CookieConsent extension allows Cross-Site Scripting (XSS).This issue affects MediaWiki CookieConsent extension: from v0.1.0 before v2.0.0.
Weakness: CWE-79
Which versions are affected by CVE-2025-62659?
How do I fix CVE-2025-62659?
No fix has been published for CVE-2025-62659 yet. Limit exposure of the affected software until one is available.
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-2025-62659 being exploited?
There is no known exploitation of CVE-2025-62659 in the wild and no public exploit code.
Sources
Also known as GHSA-8vcg-8c67-qxrf.