CVE-2025-21612 Cross-site Scripting in TabberTransclude in Extension:TabberNeue
An attacker can inject malicious scripts via page names in the TabberNeue extension, potentially compromising user sessions.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2025-21612?
CVE-2025-21612 is a high-severity cross-site scripting vulnerability in StarCitizenTools mediawiki-extensions-TabberNeue, published on 6 Jan 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
TabberNeue is a MediaWiki extension that allows the wiki to create tabs. Prior to 2.7.2, TabberTransclude.php doesn't escape the user-supplied page name when outputting, so an XSS payload as the page name can be used here. This vulnerability is fixed in 2.7.2.
Which versions are affected by CVE-2025-21612?
2 open source packages ship an affected version, including starcitizentools/tabber-neue.
| Package | Affected | Fixed in |
|---|---|---|
starcitizentools/tabber-neue Packagist | From 1.9.1 | 2.7.2 |
starcitizentools/tabber-neue Packagist | From 1.9.1 | 2.7.2 |
How do I fix CVE-2025-21612?
Upgrade starcitizentools/tabber-neue to 2.7.2 or later.
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-2025-21612 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-21612 exists.
Sources
Also known as GHSA-4x6x-8rm8-c37j.