Vulnerability in Froxlor
CVE-2026-90937
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.
Vulnerability class: CRLF Injection
CVSS v3 metric
CVSS v3 base score 9.9 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:L.
Affected products
Weakness classification (CWE)
References
- disclosure@vulncheck.com (vendor-advisory)
- disclosure@vulncheck.com (third-party-advisory)
Frequently asked questions
- What is CVE-2026-90937?
- CVE-2026-90937 is a critical-severity vulnerability in Froxlor, classified under CRLF Injection. CVSS score: 9.9/10. Published 2026-09-14.
- How severe is CVE-2026-90937?
- Critical severity. CVSS v3 base score is 9.9 out of 10.