CVE-2021-42047

Name: CVE-2021-42047
Creator: NVD / NIST
Published: 2022-09-29T03:15:14.657+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.4/10EPSS 0.64%

Last modified Jun 17, 2026

CVE-2021-42047 is a medium-severity vulnerability rated 5.4/10 on the CVSS scale. An issue was discovered in the Growth extension in MediaWiki through 1.36.2. On any Wiki with the Mentor Dashboard feature enabled, users can login with a mentor account and trigger an XSS payload (such as alert) via Growthexperiments-mentor-dashboard-mentee-overview-no-js-fallback.. EPSS estimates a 0.64% chance of exploitation in the next 30 days.

Description

An issue was discovered in the Growth extension in MediaWiki through 1.36.2. On any Wiki with the Mentor Dashboard feature enabled, users can login with a mentor account and trigger an XSS payload (such as alert) via Growthexperiments-mentor-dashboard-mentee-overview-no-js-fallback.

Metrics

CVSS 3.1

5.4/10

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

EPSS Probability

0.64%

45.9th 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/c/mediawiki/extensions/GrowthExperiments/+/720088Patch, Vendor Advisory
https://phabricator.wikimedia.org/T289063Patch, Vendor Advisory
https://gerrit.wikimedia.org/r/c/mediawiki/extensions/GrowthExperiments/+/720088Patch, Vendor Advisory
https://phabricator.wikimedia.org/T289063Patch, Vendor Advisory

Timeline

Published: Sep 29, 2022
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-42047?

How severe is CVE-2021-42047?

CVE-2021-42047 has a CVSS score of 5.4/10 (MEDIUM severity). The EPSS model estimates a 0.64% probability of exploitation in the next 30 days.

How do I fix CVE-2021-42047?

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-2021-42047?

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

Scan your code now

Source: NVD / NIST