CVE-2020-35474

Public Exploit

Description

In MediaWiki before 1.35.1, the combination of Html::rawElement and Message::text leads to XSS because the definition of MediaWiki:recentchanges-legend-watchlistexpiry can be changed onwiki so that the output is raw HTML.

Category

6.1
CVSS
Severity: Medium
CVSS 3.1 •
CVSS 2.0 •
EPSS 0.57%
Vendor Advisory fedoraproject.org Vendor Advisory wikimedia.org
Affected: n/a n/a
Published at:
Updated at:

References

Link Tags
https://phabricator.wikimedia.org/T268894 third party advisory exploit
https://lists.wikimedia.org/pipermail/mediawiki-announce/2020-December/000268.html vendor advisory mailing list release notes
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/STT5Z4A3BCXVH3WIPICWU2FP4IPIMUPC/ vendor advisory

Frequently Asked Questions

What is the severity of CVE-2020-35474?
CVE-2020-35474 has been scored as a medium severity vulnerability.
How to fix CVE-2020-35474?
To fix CVE-2020-35474, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2020-35474 being actively exploited in the wild?
It is possible that CVE-2020-35474 is being exploited or will be exploited in a near future based on public information. According to its EPSS score, there is a ~1% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
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