CVE-2024-23176 Cross-site scripting in MassMessage
Cross-site scripting vulnerability in MediaWiki MassMessage extension allows attackers to inject malicious scripts via the uselang parameter.
- 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-2024-23176?
CVE-2024-23176 is a medium-severity cross-site scripting vulnerability in MediaWiki MassMessage, published on 14 Sep 2026. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Official description
An issue was discovered in the MassMessage extension in MediaWiki before 1.40.2. For a Special:MassMessage?uselang=x-xss URL, the i18n key massmessage-form-page-help allows XSS.
Weakness: CWE-79
Which versions are affected by CVE-2024-23176?
How do I fix CVE-2024-23176?
No fix has been published for CVE-2024-23176 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-2024-23176 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2024-23176 exists.
Sources
Also known as GHSA-xxr5-62f3-4fpr.