CVE-2026-30917 Stored XSS on Bucket namespace pages
Attackers can inject malicious scripts into Bucket table fields, executing them when users view namespace pages in MediaWiki.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-30917?
CVE-2026-30917 is a high-severity cross-site scripting vulnerability in weirdgloop mediawiki-extensions-Bucket, published on 9 Mar 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Bucket is a MediaWiki extension to store and retrieve structured data on articles. Prior to 2.1.1, a stored XSS can be inserted into any Bucket table field that has a PAGE type, which will execute whenever a user views that table's corresponding Bucket namespace page. This vulnerability is fixed in 2.1.1.
Weakness: CWE-79
Which versions are affected by CVE-2026-30917?
How do I fix CVE-2026-30917?
No fix has been published for CVE-2026-30917 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-2026-30917 being exploited?
There is no known exploitation of CVE-2026-30917 in the wild and no public exploit code.
Sources
Also known as GHSA-8jrp-37wc-5v7c.