CVE-2025-53500 Stored XSS in MassEditRegex
Attackers can inject malicious scripts via the MassEditRegex extension, potentially compromising user sessions and data in MediaWiki installations.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2025-53500?
CVE-2025-53500 is a medium-severity cross-site scripting vulnerability in Wikimedia Foundation Mediawiki - MassEditRegex Extension, published on 3 Jul 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting') vulnerability in Wikimedia Foundation Mediawiki - MassEditRegex Extension allows Stored XSS.This issue affects Mediawiki - MassEditRegex Extension: from 1.39.X before 1.39.12, from 1.42.X before 1.42.7, from 1.43.X before 1.43.2.
Weakness: CWE-79
Which versions are affected by CVE-2025-53500?
It affects 1 product.
Products include Malvineous Masseditregex.
How do I fix CVE-2025-53500?
No fix has been published for CVE-2025-53500 yet. Limit exposure of the affected software until one is available.
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-2025-53500 being exploited?
There is no known exploitation of CVE-2025-53500 in the wild and no public exploit code.
Sources
Also known as GHSA-4jh6-6j22-8j58.