CVE-2021-36126 Business logic in n/a
Invalid blocker messages in MediaWiki AbuseFilter can cause fatal errors, potentially allowing malicious users to bypass blocking restrictions.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2021-36126?
CVE-2021-36126 is a critical vulnerability in Mediawiki Mediawiki, published on 2 Jul 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
An issue was discovered in the AbuseFilter extension in MediaWiki through 1.36. If the MediaWiki:Abusefilter-blocker message is invalid within the content language, the filter user falls back to the English version, but that English version could also be invalid on a wiki. This would result in a fatal error, and potentially fail to block or restrict a potentially nefarious user.
Which versions are affected by CVE-2021-36126?
1 open source package ship an affected version, including mediawiki. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
mediawiki Bitnami | All versions | 1.36.1 |
Products include Mediawiki Mediawiki.
How do I fix CVE-2021-36126?
Upgrade mediawiki to 1.36.1 or later.
Is CVE-2021-36126 being exploited?
There is no known exploitation of CVE-2021-36126 in the wild and no public exploit code.
Other vulnerabilities in Mediawiki Mediawiki
Sources
Also known as BIT-mediawiki-2021-36126, GHSA-pm9m-mcr8-3v4h.