CRLF injection in Froxlor - CVE-2026-100717
Published: September 7, 2026 / Updated: September 28, 2026
Vulnerability identifier: #VU147276
CSH Severity: Medium
CVSS v4: 7.2 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-100717
CWE-ID: CWE-93
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote user to inject arbitrary directives into web-server virtual-host configurations.
The vulnerability exists due to improper neutralization of CRLF sequences in Validate::validateUrl when processing a crafted subdomain redirect URL containing CRLF characters in the URL userinfo component. A remote user can submit a crafted redirect URL to inject arbitrary directives into web-server virtual-host configurations.
Exploitation requires subdomain-create rights and an available subdomain quota.
Affected software
Froxlor
How to mitigate CVE-2026-100717
Install security update from vendor's website.
Froxlor - update to 2.3.12