CVE-2021-42048 Cross-site scripting in n/a
Administrators can inject arbitrary JavaScript into the Newcomer home page, allowing execution against new users and potential account takeover.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2021-42048?
CVE-2021-42048 is a medium-severity cross-site scripting vulnerability in Mediawiki Mediawiki, published on 6 Oct 2021. An attacker needs administrator access to exploit it, and only if a user opens a file or follows a link.
Official description
An issue was discovered in the Growth extension in MediaWiki through 1.36.2. Any admin can add arbitrary JavaScript code to the Newcomer home page footer, which can be executed by viewers with zero edits.
Weakness: CWE-79
Which versions are affected by CVE-2021-42048?
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-2021-42048?
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-2021-42048 being exploited?
There is no known exploitation of CVE-2021-42048 in the wild and no public exploit code.
Other vulnerabilities in Mediawiki Mediawiki
Sources
Also known as BIT-mediawiki-2021-42048, GHSA-89h4-mq5m-6vvc.