Cross-site Scripting (XSS) Affecting mediawiki package, versions <1:1.35.0-1


Severity

Recommended
0.0
medium
0
10

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Threat Intelligence

EPSS
0.17% (55th percentile)

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  • Snyk IDSNYK-DEBIAN11-MEDIAWIKI-1012655
  • published25 Sept 2020
  • disclosed27 Sept 2020

Introduced: 25 Sep 2020

CVE-2020-25828  (opens in a new tab)
CWE-79  (opens in a new tab)

How to fix?

Upgrade Debian:11 mediawiki to version 1:1.35.0-1 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 Debian. See How to fix? for Debian:11 relevant fixed versions and status.

An issue was discovered in MediaWiki before 1.31.10 and 1.32.x through 1.34.x before 1.34.4. The non-jqueryMsg version of mw.message().parse() doesn't escape HTML. This affects both message contents (which are generally safe) and the parameters (which can be based on user input). (When jqueryMsg is loaded, it correctly accepts only whitelisted tags in message contents, and escapes all parameters. Situations with an unloaded jqueryMsg are rare in practice, but can for example occur for Special:SpecialPages on a wiki with no extensions installed.)

CVSS Scores

version 3.1