Improper Encoding or Escaping of Output Affecting mediawiki package, versions <1:1.35.1-1


Severity

Recommended
0.0
high
0
10

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Threat Intelligence

EPSS
0.14% (51st percentile)

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  • Snyk IDSNYK-DEBIAN11-MEDIAWIKI-1052800
  • published18 Dec 2020
  • disclosed18 Dec 2020

Introduced: 18 Dec 2020

CVE-2020-35475  (opens in a new tab)
CWE-116  (opens in a new tab)

How to fix?

Upgrade Debian:11 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 Debian. See How to fix? for Debian:11 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 Scores

version 3.1