EUVD-2026-87690
GHSA-qjpj-j6j4-mcpf
Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:H/VA:H/SC:L/SI:H/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Network-reachable with only low-priv customer auth and no interaction; injected config runs as root affecting the whole host (S:C), enabling file reads (C:H), response hijack (I:H) and config breakage (A:H).
Primary rating from Vendor (VulnCheck).
CVSS VectorVendor: VulnCheck
Lifecycle Timeline
5DescriptionCVE.org
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.
Articles & Coverage 2
AnalysisAI
Authenticated low-privilege Froxlor users with subdomain-create rights can inject arbitrary nginx or Apache configuration directives via CRLF sequences in the userinfo component of a subdomain redirect URL, leading to server-wide response hijacking and local file disclosure. The vulnerability affects versions 0 through 2.3.10 (incompletely fixed) and up to version 2.3.12, which contains the complete fix. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Requires an authenticated Froxlor customer account that has subdomain-create rights (explicitly NOT admin and NOT change_serversettings), and the deployment must use Froxlor's automatic nginx or Apache vhost generation with root-privileged config regeneration/reload - the default operating mode of the panel. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | This is a genuine high-priority vulnerability, not a high-CVSS-but-low-risk paper finding. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Upgrade to Froxlor version 2.3.12 or later, which contains the complete fix for this CRLF injection. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory all Froxlor instances to identify versions earlier than 2.3.12 and immediately restrict subdomain-create permissions to trusted administrators only; review web server logs for CRLF injection patterns in redirect URLs. …
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External POC / Exploit Code
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