CVE-2020-25814 MediaWiki Cross-site Scripting (XSS) vulnerability
An attacker can inject malicious JavaScript via MediaWiki messages that executes when clicked, 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-2020-25814?
CVE-2020-25814 is a medium-severity cross-site scripting vulnerability in Fedoraproject Fedora, published on 27 Sep 2020. 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
In MediaWiki before 1.31.10 and 1.32.x through 1.34.x before 1.34.4, XSS related to jQuery can occur. The attacker creates a message with [javascript:payload xss] and turns it into a jQuery object with mw.message().parse(). The expected result is that the jQuery object does not contain an <a> tag (or it does not have a href attribute, or it's empty, etc.). The actual result is that the object contains an <a href ="javascript... that executes when clicked.
Weakness: CWE-79
Which versions are affected by CVE-2020-25814?
7 open source packages ship an affected version, including mediawiki/core and mediawiki. It affects 2 products.
| Package | Affected | Fixed in |
|---|---|---|
mediawiki/core Packagist | From 1.31.0 | 1.31.9 |
mediawiki/core Packagist | From 1.31.0 | 1.31.9 |
mediawiki/core Packagist | From 1.32.0 | 1.34.3 |
mediawiki/core Packagist | From 1.32.0 | 1.34.3 |
mediawiki/core Packagist | From 1.35.0-rc.0 | 1.35.0 |
mediawiki/core Packagist | From 1.35.0-rc.0 | 1.35.0 |
1 more packages
mediawiki Bitnami | All versions | 1.31.10, 1.34.4 |
Products include Fedoraproject Fedora, Mediawiki Mediawiki.
How do I fix CVE-2020-25814?
Upgrade mediawiki/core to a fixed version for your release line: 1.31.9, 1.34.3 or 1.35.0.
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-2020-25814 being exploited?
There is no known exploitation of CVE-2020-25814 in the wild and no public exploit code.
Other vulnerabilities in Fedoraproject Fedora
Sources
Also known as BIT-mediawiki-2020-25814, DEBIAN-CVE-2020-25814, GHSA-4vr7-m8p8-434h, UBUNTU-CVE-2020-25814.