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Improper Encoding or Escaping of Output Affecting mediawiki package, versions <1:1.31.12-1~deb10u1

0.0
high

Snyk CVSS

    Attack Complexity Low
    Confidentiality High

    Threat Intelligence

    EPSS 0.2% (57th percentile)
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NVD
7.5 high
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Red Hat
7.5 high

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  • Snyk ID SNYK-DEBIAN10-MEDIAWIKI-1052802
  • published 18 Dec 2020
  • disclosed 18 Dec 2020
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Introduced: 18 Dec 2020

CVE-2020-35475 Open this link in a new tab
CWE-116 Open this link in a new tab

How to fix?

Upgrade Debian:10 mediawiki to version 1:1.31.12-1~deb10u1 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:10 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.)