CVE-2021-42041 Cross-site scripting in n/a
Attackers can inject and execute HTML or JavaScript via the setchange log in MediaWiki CentralAuth, potentially compromising user sessions.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2021-42041?
CVE-2021-42041 is a medium-severity cross-site scripting vulnerability in Mediawiki Mediawiki, published on 6 Oct 2021. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
An issue was discovered in CentralAuth in MediaWiki through 1.36.2. The rightsnone MediaWiki message was not being properly sanitized and allowed for the injection and execution of HTML and JavaScript via the setchange log.
Weakness: CWE-79
Which versions are affected by CVE-2021-42041?
1 open source package ship an affected version, including mediawiki. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
mediawiki Bitnami | All versions | 1.36.3 |
Products include Mediawiki Mediawiki.
How do I fix CVE-2021-42041?
Upgrade mediawiki to 1.36.3 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-2021-42041 being exploited?
There is no known exploitation of CVE-2021-42041 in the wild and no public exploit code.
Other vulnerabilities in Mediawiki Mediawiki
Sources
Also known as BIT-mediawiki-2021-42041, GHSA-chhp-78gp-3h92.