CVE-2020-25812 MediaWiki Cross-site Scripting (XSS) vulnerability

What is CVE-2020-25812?

CVE-2020-25812 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

An issue was discovered in MediaWiki 1.34.x before 1.34.4. On Special:Contributions, the NS filter uses unescaped messages as keys in the option key for an HTMLForm specifier. This is vulnerable to a mild XSS if one of those messages is changed to include raw HTML.

Weakness: CWE-79

Which versions are affected by CVE-2020-25812?

5 open source packages ship an affected version, including mediawiki/core and mediawiki. It affects 2 products.

Products include Fedoraproject Fedora, Mediawiki Mediawiki.

How do I fix CVE-2020-25812?

Upgrade mediawiki/core to a fixed version for your release line: 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-2020-25812 being exploited?

There is no known exploitation of CVE-2020-25812 in the wild and no public exploit code.

Other vulnerabilities in Fedoraproject Fedora

• CVE-2024-4577 PHP-CGI OS Command Injection Exploited Critical 9.8
• CVE-2021-39226 Grafana Authentication Bypass Exploited Critical 9.8
• CVE-2019-5544 VMware ESXi and Horizon DaaS OpenSLP Heap-Based Buffer Overflow Exploited Critical 9.8
• CVE-2024-4947 Google Chromium V8 Type Confusion Exploited Critical 9.6
• CVE-2024-4671 Google Chromium Visuals Use-After-Free Exploited Critical 9.6

All Fedoraproject Fedora vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as BIT-mediawiki-2020-25812, DEBIAN-CVE-2020-25812, GHSA-rj9p-8jxj-2ch4, UBUNTU-CVE-2020-25812.