CVE-2020-35479 Information

Description

MediaWiki before 1.35.1 allows XSS via BlockLogFormatter.php. Language::translateBlockExpiry itself does not escape in all code paths. For example the return of Language::userTimeAndDate is is always unsafe for HTML in a month value. This affects MediaWiki 1.12.0 and later.

CVSS Vector

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

Reference

https://lists.wikimedia.org/pipermail/mediawiki-announce/2020-December/000268.html https://phabricator.wikimedia.org/T268938 https://www.debian.org/security/2020/dsa-4816 https://lists.debian.org/debian-lts-announce/2020/12/msg00034.html https://lists.fedoraproject.org/archives/list/[email protected]/message/STT5Z4A3BCXVH3WIPICWU2FP4IPIMUPC/

Attack Complexity

LOW

Privileges Required

NONE

User Interaction Required

NONE

Scope

REQUIRED

Confidentiality Impact

CHANGED

Integrity Impact

LOW

Availability Impact

LOW

Base Score

NONE

Base Severity

6.1