CVE-2020-35479: MediaWiki before 1.35.1 allows XSS via BlockLogFormatter.php. Language::translateBlockExpiry itself does not escape in all code paths. For example, the return…

PriorityP425medium6.1CVSS 3.1

AVNACLPRNUIRSCCLILAN

EPSS

1.48%

70.9th percentile

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.

Affected

9 ranges

Vendor	Product	Version range	Fixed in
debian	debian_linux	—	—
debian	debian_linux	—	—
debian	mediawiki	< mediawiki 1:1.35.1-1 (bookworm)	mediawiki 1:1.35.1-1 (bookworm)
fedoraproject	fedora	—	—
mediawiki	mediawiki	>= 0 < 1:1.35.1-1	1:1.35.1-1
mediawiki	mediawiki	>= 0 < 1:1.35.1-1	1:1.35.1-1
mediawiki	mediawiki	>= 0 < 1:1.35.1-1	1:1.35.1-1
mediawiki	mediawiki	>= 0 < 1:1.35.1-1	1:1.35.1-1
mediawiki	mediawiki	>= 1.12.0 < 1.35.1	1.35.1

CVSS provenance

nvdv3.16.1MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

nvdv2.04.3MEDIUMAV:N/AC:M/Au:N/C:N/I:P/A:N

osv6.1MEDIUM

vendor_debian6.1MEDIUM

vendor_redhat6.1MEDIUM

Stop checking back — get the weekly exploitation signal.

Every Monday: what got weaponized or added to CISA KEV in the last seven days — each CVE cross-linked to its PoC, Nuclei template, and detection rule. Free, one email a week, unsubscribe in one click.