CVE-2020-35475 Information

Description

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 Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Reference

https://phabricator.wikimedia.org/T268917 https://lists.wikimedia.org/pipermail/mediawiki-announce/2020-December/000268.html https://www.debian.org/security/2020/dsa-4816 https://lists.fedoraproject.org/archives/list/[email protected]/message/STT5Z4A3BCXVH3WIPICWU2FP4IPIMUPC/

Attack Complexity

LOW

Privileges Required

NONE

User Interaction Required

NONE

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

HIGH

Availability Impact

NONE

Base Score

NONE

Base Severity

7.5