CVE-2020-25828

Name: CVE-2020-25828
Creator: NVD / NIST
Published: 2020-09-27T21:15:12.877+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.1/10EPSS 1.09%

Last modified Jun 17, 2026

CVE-2020-25828 is a medium-severity vulnerability rated 6.1/10 on the CVSS scale. An issue was discovered in MediaWiki before 1.31.10 and 1.32.x through 1.34.x before 1.34.4. The non-jqueryMsg version of mw.message().parse() doesn't escape HTML. EPSS estimates a 1.09% chance of exploitation in the next 30 days.

Description

An issue was discovered in MediaWiki before 1.31.10 and 1.32.x through 1.34.x before 1.34.4. The non-jqueryMsg version of mw.message().parse() doesn't escape HTML. This affects both message contents (which are generally safe) and the parameters (which can be based on user input). (When jqueryMsg is loaded, it correctly accepts only whitelisted tags in message contents, and escapes all parameters. Situations with an unloaded jqueryMsg are rare in practice, but can for example occur for Special:SpecialPages on a wiki with no extensions installed.)

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

1.09%

61.1th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-79

Affected Software

Vendor	Product	Versions
Mediawiki	Mediawiki	>= 1.32.0, < 1.34.4
Mediawiki	Mediawiki	1.31.10
Fedoraproject	Fedora	33

References

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/RTTPZ7XMDS66I442OLLHXBDNP2LCBJU6/
https://lists.wikimedia.org/pipermail/mediawiki-announceVendor Advisory
https://lists.wikimedia.org/pipermail/mediawiki-l/2020-September/048480.htmlMailing List, Vendor Advisory
https://lists.wikimedia.org/pipermail/mediawiki-l/2020-September/048488.htmlMailing List, Vendor Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/RTTPZ7XMDS66I442OLLHXBDNP2LCBJU6/
https://lists.wikimedia.org/pipermail/mediawiki-announceVendor Advisory
https://lists.wikimedia.org/pipermail/mediawiki-l/2020-September/048480.htmlMailing List, Vendor Advisory
https://lists.wikimedia.org/pipermail/mediawiki-l/2020-September/048488.htmlMailing List, Vendor Advisory

Timeline

Published: Sep 27, 2020
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-25828?

How severe is CVE-2020-25828?

CVE-2020-25828 has a CVSS score of 6.1/10 (MEDIUM severity). The EPSS model estimates a 1.09% probability of exploitation in the next 30 days.

How do I fix CVE-2020-25828?

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-2020-25828?

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

Scan your code now

Source: NVD / NIST