CVE-2020-35479

Medium

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.

SeverityMedium

CVSS6.1

Exploit probability—

Product

Mediawiki

PublishedDec 18, 2020

First seenDec 18, 2020

How to fix

Update

mediawiki mediawiki1.35.1 or later

Vendor advisories

debian.org/security/2020/dsa-4816
lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/STT5Z4A3BCXVH3WIPICWU2FP4IPIMUPC/

Affected products

Product	Affected versions	Fixed in
mediawiki mediawiki	1.12.0 ≤ v < 1.35.1	1.35.1
debian debian_linux	9.0, 10.0	—
fedoraproject fedora	33	—

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