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


Severity

Recommended
0.0
medium
0
10

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Threat Intelligence

EPSS
1.04% (64th percentile)

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  • Snyk IDSNYK-ECHOLATEST-MEDIAWIKI-20414296
  • published3 Oct 2026
  • disclosed18 Dec 2020

Introduced: 18 Dec 2020

CVE-2020-35474  (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 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.

CVSS Base Scores

version 3.1