EUVD-2026-30935
GHSA-72fg-f46j-5gvp
CVSS VectorNVD
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/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
Lifecycle Timeline
5DescriptionNVD
HestiaCP versions 1.2.0 through 1.9.4 contain an IP spoofing vulnerability that allows unauthenticated remote attackers to bypass authentication security controls by supplying an arbitrary IP address in the CF-Connecting-IP HTTP header without verifying the request originated from Cloudflare's network. Attackers can exploit this to circumvent fail2ban brute-force protection, bypass per-user IP allowlists, and poison authentication audit logs by spoofing trusted IP addresses on each request.
AnalysisAI
Authentication security bypass in HestiaCP 1.2.0 through 1.9.4 allows unauthenticated remote attackers to spoof their source IP address by injecting an arbitrary value into the CF-Connecting-IP HTTP header, which the panel trusts unconditionally without verifying the request originated from Cloudflare's network. This enables attackers to defeat fail2ban brute-force throttling, evade per-user IP allowlists, and poison authentication audit logs. …
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RemediationAI
Within 24 hours: Identify all HestiaCP instances in production and determine which versions are deployed (1.2.0-1.9.4 are affected); obtain and apply the vendor patch immediately. Within 7 days: Complete patching across all HestiaCP deployments and validate fail2ban and rate-limiting controls function correctly post-patch. …
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External POC / Exploit Code
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