CVE-2021-31551 Cross-site scripting in n/a
Crafted payloads in Token query parameters allow XSS on MediaWiki pages managed by the PageForms extension.
- 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-2021-31551?
CVE-2021-31551 is a medium-severity cross-site scripting vulnerability in Mediawiki Mediawiki, published on 22 Apr 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 the PageForms extension for MediaWiki through 1.35.2. Crafted payloads for Token-related query parameters allowed for XSS on certain PageForms-managed MediaWiki pages.
Weakness: CWE-79
Which versions are affected by CVE-2021-31551?
1 open source package ship an affected version, including mediawiki. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
mediawiki Bitnami | All versions | 1.35.3 |
Products include Mediawiki Mediawiki.
How do I fix CVE-2021-31551?
Upgrade mediawiki to 1.35.3 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-2021-31551 being exploited?
There is no known exploitation of CVE-2021-31551 in the wild and no public exploit code.
Other vulnerabilities in Mediawiki Mediawiki
Sources
Also known as BIT-mediawiki-2021-31551, GHSA-vf5h-f8r3-vj4x.