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CVE-2026-100717: froxlor

Severity

8.5 (HIGH)

Vendor

FROXLOR

Affected versions

0 through before 2.3.12

Fixed version

2.3.12

Patch status

Patched

Published

2026-09-26T14:16:57.753

Modified

2026-09-26T14:16:57.867

Why it matters

High-severity vulnerability requiring prioritized review.

Recommended admin actions

• Review and patch based on exposure, asset criticality, and business impact.

Technical summary

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";%0a@evil.com/). 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.

View the official NVD record for CVE-2026-100717

CVE data is sourced from NVD/CNA records and optional enrichment. Validate against the vendor advisory before taking production action.