Vulnerability · Published Sep 14, 2026 · Assigned by VulnCheck

CVE-2026-90937froxlor before 2.2.5 nginx/Apache Configuration Injection via subdomain redirect URL

Critical 9.9

In plain English

A critical-severity security flaw in froxlor from froxlor. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 39% of all known vulnerabilities).

Severity (CVSS 3.1)9.9Critical

Exploit odds (30 days)0.5%top 60.6% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official 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.

Affected products (as reported)

Vendor	Product	Versions
froxlor	froxlor	0 – before 2.2.5

Weakness: CWE-93 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:L

References

GitHub Security Advisory (GHSA-c3p2-mj7v-5mrc) vendor-advisory
VulnCheck Advisory: froxlor before 2.2.5 nginx/Apache Configuration Injection via subdomain redirect URL third-party-advisory