CVE-2024-34507

Name: CVE-2024-34507
Creator: NVD / NIST
Published: 2024-05-05T19:15:07.307+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.4/10EPSS 0.67%

Last modified Jun 17, 2026

CVE-2024-34507 is a high-severity vulnerability rated 7.4/10 on the CVSS scale. An issue was discovered in includes/CommentFormatter/CommentParser.php in MediaWiki before 1.39.7, 1.40.x before 1.40.3, and 1.41.x before 1.41.1. XSS can occur because of mishandling of the 0x1b character, as demonstrated by Special:RecentChanges#%1b0000000.. EPSS estimates a 0.67% chance of exploitation in the next 30 days.

Description

An issue was discovered in includes/CommentFormatter/CommentParser.php in MediaWiki before 1.39.7, 1.40.x before 1.40.3, and 1.41.x before 1.41.1. XSS can occur because of mishandling of the 0x1b character, as demonstrated by Special:RecentChanges#%1b0000000.

Metrics

CVSS 3.1

7.4/10

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

EPSS Probability

0.67%

47.4th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-80

Affected Software

Vendor	Product	Versions
Mediawiki	Mediawiki	< 1.39.7
Mediawiki	Mediawiki	>= 1.40.0, < 1.40.3
Mediawiki	Mediawiki	>= 1.41.0, < 1.41.1
Fedoraproject	Fedora	40

References

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/FU2FGUXXK6TMV6R52VRECLC6XCSQQISY/Third Party Advisory
https://phabricator.wikimedia.org/T355538Exploit, Issue Tracking, Vendor Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/FU2FGUXXK6TMV6R52VRECLC6XCSQQISY/Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/FU2FGUXXK6TMV6R52VRECLC6XCSQQISY/
https://phabricator.wikimedia.org/T355538Exploit, Issue Tracking, Vendor Advisory

Timeline

Published: May 5, 2024
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2024-34507?

How severe is CVE-2024-34507?

CVE-2024-34507 has a CVSS score of 7.4/10 (HIGH severity). The EPSS model estimates a 0.67% probability of exploitation in the next 30 days.

How do I fix CVE-2024-34507?

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-2024-34507?

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

Scan your code now

Source: NVD / NIST