CVE-2023-37255 Cross-site scripting in n/a
Attackers can inject HTML via User-Agent headers in MediaWiki's CheckUser extension, potentially executing scripts or bypassing security controls.
- 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-2023-37255?
CVE-2023-37255 is a medium-severity cross-site scripting vulnerability in Mediawiki Mediawiki, published on 29 Jun 2023. 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 CheckUser extension for MediaWiki through 1.39.3. In Special:CheckUser, a check of the "get edits" type is vulnerable to HTML injection through the User-Agent HTTP request header.
Weakness: CWE-79
Which versions are affected by CVE-2023-37255?
1 open source package ship an affected version, including mediawiki. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
mediawiki Bitnami | All versions | 1.39.4 |
Products include Mediawiki Mediawiki.
How do I fix CVE-2023-37255?
Upgrade mediawiki to 1.39.4 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-2023-37255 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2023-37255 exists.
Other vulnerabilities in Mediawiki Mediawiki
Sources
Also known as BIT-mediawiki-2023-37255, GHSA-c5v4-mrjh-44fj.