CVE-2021-36131

Name: CVE-2021-36131
Creator: NVD / NIST
Published: 2021-07-02T13:15:07.923+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 4.8/10EPSS 0.45%

Last modified Jun 17, 2026

CVE-2021-36131 is a medium-severity vulnerability rated 4.8/10 on the CVSS scale. An XSS issue was discovered in the SportsTeams extension in MediaWiki through 1.36. Within several special pages, a privileged user could inject arbitrary HTML and JavaScript within various data fields. EPSS estimates a 0.45% chance of exploitation in the next 30 days.

Description

An XSS issue was discovered in the SportsTeams extension in MediaWiki through 1.36. Within several special pages, a privileged user could inject arbitrary HTML and JavaScript within various data fields. The attack could easily propagate across many pages for many users.

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

0.45%

35.6th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-79

Affected Software

Vendor	Product	Versions
Mediawiki	Mediawiki	<= 1.36

References

https://gerrit.wikimedia.org/r/q/Ic312cc9b8463c8e7c3298a661abfcff2cc2332cbPatch, Vendor Advisory
https://phabricator.wikimedia.org/T281196Issue Tracking, Patch, Vendor Advisory
https://gerrit.wikimedia.org/r/q/Ic312cc9b8463c8e7c3298a661abfcff2cc2332cbPatch, Vendor Advisory
https://phabricator.wikimedia.org/T281196Issue Tracking, Patch, Vendor Advisory

Timeline

Published: Jul 2, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-36131?

How severe is CVE-2021-36131?

CVE-2021-36131 has a CVSS score of 4.8/10 (MEDIUM severity). The EPSS model estimates a 0.45% probability of exploitation in the next 30 days.

How do I fix CVE-2021-36131?

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-2021-36131?

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

Scan your code now

Source: NVD / NIST