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.)
                
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References
        History
                    No history.
 MITRE
                        MITRE
                    Status: PUBLISHED
Assigner: mitre
Published: 2020-12-18T07:32:34
Updated: 2024-08-04T17:02:08.062Z
Reserved: 2020-12-16T00:00:00
Link: CVE-2020-35475
 Vulnrichment
                        Vulnrichment
                    No data.
 NVD
                        NVD
                    Status : Modified
Published: 2020-12-18T08:15:15.137
Modified: 2024-11-21T05:27:22.060
Link: CVE-2020-35475
 Redhat
                        Redhat