CVE-2020-35479

MEDIUM

MediaWiki 1.12.0-1.35.0 - Cross-Site Scripting via BlockLogFormatter.php

Title source: llm

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.

References (5)

Core 5

Core References

Exploit, Vendor Advisory x_refsource_misc

https://phabricator.wikimedia.org/T268938

Mailing List, Release Notes, Vendor Advisory x_refsource_misc

https://lists.wikimedia.org/pipermail/mediawiki-announce/2020-December/000268.html

Third Party Advisory vendor-advisory x_refsource_debian

https://www.debian.org/security/2020/dsa-4816

Mailing List, Third Party Advisory mailing-list x_refsource_mlist

https://lists.debian.org/debian-lts-announce/2020/12/msg00034.html

Mailing List, Third Party Advisory vendor-advisory x_refsource_fedora

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/STT5Z4A3BCXVH3WIPICWU2FP4IPIMUPC/

Scores

CVSS v3 6.1

EPSS 0.0086

EPSS Percentile 75.3%

Attack Vector NETWORK

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

Details

CWE

CWE-79

Status published

Products (4)

debian/debian_linux 9.0

debian/debian_linux 10.0

fedoraproject/fedora 33

mediawiki/mediawiki 1.12.0 - 1.35.1

Published Dec 18, 2020

Tracked Since Feb 18, 2026