CVE-2021-42043

Name: CVE-2021-42043
Creator: NVD / NIST
Published: 2021-10-06T21:15:07.337+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.1/10EPSS 0.73%

Last modified Jun 17, 2026

CVE-2021-42043 is a medium-severity vulnerability rated 6.1/10 on the CVSS scale. An issue was discovered in Special:MediaSearch in the MediaSearch extension in MediaWiki through 1.36.2. The suggestion text (a parameter to mediasearch-did-you-mean) was not being properly sanitized and allowed for the injection and execution of HTML and JavaScript via the intitle: search operator within the query.. EPSS estimates a 0.73% chance of exploitation in the next 30 days.

Description

An issue was discovered in Special:MediaSearch in the MediaSearch extension in MediaWiki through 1.36.2. The suggestion text (a parameter to mediasearch-did-you-mean) was not being properly sanitized and allowed for the injection and execution of HTML and JavaScript via the intitle: search operator within the query.

Metrics

CVSS 3.1

6.1/10

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

EPSS Probability

0.73%

49.4th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-79

Affected Software

Vendor	Product	Versions
Mediawiki	Mediawiki	<= 1.36.2

References

https://gerrit.wikimedia.org/r/q/If64eb5842237c92290d07ebc3fe14710d9de3fc2Patch, Vendor Advisory
https://phabricator.wikimedia.org/T291600Issue Tracking, Patch, Vendor Advisory
https://gerrit.wikimedia.org/r/q/If64eb5842237c92290d07ebc3fe14710d9de3fc2Patch, Vendor Advisory
https://phabricator.wikimedia.org/T291600Issue Tracking, Patch, Vendor Advisory

Timeline

Published: Oct 6, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-42043?

How severe is CVE-2021-42043?

CVE-2021-42043 has a CVSS score of 6.1/10 (MEDIUM severity). The EPSS model estimates a 0.73% probability of exploitation in the next 30 days.

How do I fix CVE-2021-42043?

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-2021-42043?

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

Scan your code now

Source: NVD / NIST