CVE-2021-42046 Cross-site scripting in n/a
Attackers can inject HTML and JavaScript via unescaped messages in the GlobalWatchlist extension, potentially leading to session hijacking or malicious actions.
- 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-2021-42046?
CVE-2021-42046 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 the GlobalWatchlist extension in MediaWiki through 1.36.2. The rev-deleted-user and ntimes messages were not properly escaped and allowed for users to inject HTML and JavaScript.
Weakness: CWE-79
Which versions are affected by CVE-2021-42046?
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-2021-42046?
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-2021-42046 being exploited?
There is no known exploitation of CVE-2021-42046 in the wild and no public exploit code.
Other vulnerabilities in Mediawiki Mediawiki
Sources
Also known as BIT-mediawiki-2021-42046, GHSA-3496-pjp5-xxqp.