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8.5

Froxlor allows low‑privilege users to inject server config

CVE-2026-100717 · published 23 days ago
Summary

A version of the Froxlor control panel lets a customer with only subdomain‑creation rights add a specially crafted URL that inserts hidden characters into the web‑server configuration. When the panel writes this configuration, the hidden characters break out of the intended line and add arbitrary server directives, potentially letting the attacker change how the web server works or read files. Upgrade to Froxlor version 2.3.12 or later to stop this behavior.

What to do
  • Update froxlor froxlor to version 2.3.12 or later.
Affected software
VendorProductAffected versions
froxlor froxlor < 2.3.12
Original advisory text
froxlor before 2.3.12 CRLF Injection via validateUrl userinfo
froxlor is a server administration panel. In versions 2.3.10 and earlier, Validate::validateUrl rejects carriage return and line feed characters only in the path, query and fragment components returned by parse_url, and never inspects the userinfo (user:pass@) components. This is an incomplete fix for GHSA-c3p2. An authenticated low-privilege customer with subdomain-create rights (no admin or change_serversettings privilege required) can supply a subdomain redirect URL that carries a CR/LF payload in the userinfo portion (e.g. http://user%0areturn 200 "pwned";%[email protected]/). The value passes validation, survives IDNA encoding, and is written verbatim into the generated nginx or Apache vhost configuration, allowing the attacker to break out of the emitted directive and inject arbitrary web-server configuration lines. froxlor regenerates and reloads the web-server configuration as root, so the injected directives take effect server-wide and can hijack responses or read local files. The issue is fixed in version 2.3.12.
References
Fix within
Internet-facing 60 days
Internal At next upgrade
  • Not known to be exploited
  • Needs hands-on effort to exploit
  • Gives an attacker partial control
Severity
8.5 High
Exploitation
<1% chance of attack within 30 days
Type
CWE-93Improper Neutralization of CRLF Sequences ('CRLF Injection')
Timeline
Published26 Sep 2026
Updated19 Oct 2026
First seen26 Sep 2026
Sources
CVE-2026-100717 · NVD
CVE-2026-100717 · MITRE
CVE-2026-100717 · OSV
GHSA-gxx3-hwjc-h2gp · GHSA
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