CVE-2025-53500

Name: CVE-2025-53500
Creator: NVD / NIST
Published: 2025-07-03T17:15:39.99+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.6/10EPSS 0.24%

Last modified Jun 17, 2026

CVE-2025-53500 is a medium-severity vulnerability rated 5.6/10 on the CVSS scale. 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.. EPSS estimates a 0.24% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

5.6/10

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L

EPSS Probability

0.24%

15.2th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-79

Affected Software

Vendor	Product	Versions
Malvineous	Masseditregex	All versions

References

https://gerrit.wikimedia.org/r/c/mediawiki/extensions/MassEditRegex/+/1163878/Patch
https://phabricator.wikimedia.org/T397334Exploit, Issue Tracking, Patch

Timeline

Published: Jul 3, 2025
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2025-53500?

How severe is CVE-2025-53500?

CVE-2025-53500 has a CVSS score of 5.6/10 (MEDIUM severity). The EPSS model estimates a 0.24% probability of exploitation in the next 30 days.

How do I fix CVE-2025-53500?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2025-53500?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST