Cross-site Scripting (XSS) Affecting mediawiki package, versions <1:1.35.1-1


Severity

Recommended
0.0
high
0
10

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Threat Intelligence

EPSS
1.59% (75th percentile)

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  • Snyk IDSNYK-ECHOLATEST-MEDIAWIKI-20414297
  • published3 Oct 2026
  • disclosed18 Dec 2020

Introduced: 18 Dec 2020

CVE-2020-35475  (opens in a new tab)
CWE-79  (opens in a new tab)

How to fix?

Upgrade Echo:latest mediawiki to version 1:1.35.1-1 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream mediawiki package and not the mediawiki package as distributed by Echo. See How to fix? for Echo:latest relevant fixed versions and status.

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.)

CVSS Base Scores

version 3.1