CVE-2021-46150

Name: CVE-2021-46150
Creator: NVD / NIST
Published: 2022-01-10T14:11:29.43+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 4.8/10EPSS 0.65%

Last modified Jun 17, 2026

CVE-2021-46150 is a medium-severity vulnerability rated 4.8/10 on the CVSS scale. An issue was discovered in MediaWiki before 1.35.5, 1.36.x before 1.36.3, and 1.37.x before 1.37.1. Special:CheckUserLog allows CheckUser XSS because of date mishandling, as demonstrated by an XSS payload in MediaWiki:October.. EPSS estimates a 0.65% chance of exploitation in the next 30 days.

Description

An issue was discovered in MediaWiki before 1.35.5, 1.36.x before 1.36.3, and 1.37.x before 1.37.1. Special:CheckUserLog allows CheckUser XSS because of date mishandling, as demonstrated by an XSS payload in MediaWiki:October.

Metrics

CVSS 3.1

4.8/10

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

EPSS Probability

0.65%

46.3th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-79

Affected Software

Vendor	Product	Versions
Mediawiki	Mediawiki	< 1.35.5
Mediawiki	Mediawiki	>= 1.36.0, < 1.36.3
Mediawiki	Mediawiki	>= 1.37.0, < 1.37.1

References

https://gerrit.wikimedia.org/r/plugins/gitiles/mediawiki/extensions/CheckUser/+/79c2c49a18f96b159258958feca90fce964c350aThird Party Advisory
https://phabricator.wikimedia.org/T292795Exploit, Third Party Advisory
https://gerrit.wikimedia.org/r/plugins/gitiles/mediawiki/extensions/CheckUser/+/79c2c49a18f96b159258958feca90fce964c350aThird Party Advisory
https://phabricator.wikimedia.org/T292795Exploit, Third Party Advisory

Timeline

Published: Jan 10, 2022
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-46150?

How severe is CVE-2021-46150?

CVE-2021-46150 has a CVSS score of 4.8/10 (MEDIUM severity). The EPSS model estimates a 0.65% probability of exploitation in the next 30 days.

How do I fix CVE-2021-46150?

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-2021-46150?

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

Scan your code now

Source: NVD / NIST