CVE-2020-35475

Description

In MediaWiki before 1.35.1, the messages userrights-expiry-current and userrights-expiry-none can contain raw HTML. XSS can happen when a user visits Special:UserRights but does not have rights to change all userrights, and the table on the left side has unchangeable groups in it. (The right column with the changeable groups is not affected and is escaped correctly.)

Category

7.5
CVSS
Severity: High
CVSS 3.1 •
CVSS 2.0 •
EPSS 0.72% Top 30%
Vendor Advisory debian.org Vendor Advisory fedoraproject.org Vendor Advisory wikimedia.org
Affected: n/a n/a
Published at:
Updated at:

References

Link Tags
https://phabricator.wikimedia.org/T268917 issue tracking third party advisory
https://lists.wikimedia.org/pipermail/mediawiki-announce/2020-December/000268.html mailing list release notes vendor advisory
https://www.debian.org/security/2020/dsa-4816 third party advisory vendor advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/STT5Z4A3BCXVH3WIPICWU2FP4IPIMUPC/ vendor advisory

Frequently Asked Questions

What is the severity of CVE-2020-35475?
CVE-2020-35475 has been scored as a high severity vulnerability.
How to fix CVE-2020-35475?
To fix CVE-2020-35475, 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-2020-35475 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2020-35475 is being actively exploited. 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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