CVE-2026-90937

Critical

Description

froxlor versions before 2.2.5 fail to validate newline characters in subdomain redirect URLs, allowing authenticated customers to inject arbitrary nginx or Apache configuration directives. Attackers can supply URLs containing literal newlines that are written verbatim into vhost config files during cron rebuild, enabling web server configuration corruption, denial of service, or hijacking of HTTP responses across hosted domains.

SeverityCritical

CVSS9.9

Exploit probability—

ProductFroxlor

PublishedSep 14, 2026

First seenSep 14, 2026

Weakness typeCWE-93CWE-93

How to fix

Update

froxlor froxlor2.2.5 or later

Vendor advisories

github.com/froxlor/froxlor/security/advisories/GHSA-c3p2-mj7v-5mrc

Affected products

Product	Affected versions	Fixed in
froxlor froxlor	v < 2.2.5	2.2.5

Check your version

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