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CVE-2026-43634— HestiaCP 1.2.0-1.9.4 IP Spoofing via CF-Connecting-IP Header

CVSS 7.5 · High EPSS 0.06% · P18

Affected Version Matrix 2

VendorProductVersion RangeStatus
hestiacphestiacp1.2.0≤ 1.9.4affected
f381e294500f671cf12716c638afd0bfde901f88unaffected
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I. Basic Information for CVE-2026-43634

Vulnerability Information
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Vulnerability Title
HestiaCP 1.2.0-1.9.4 IP Spoofing via CF-Connecting-IP Header
Source: NVD (National Vulnerability Database)
Vulnerability Description
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.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Source: NVD (National Vulnerability Database)
Vulnerability Type
使用不可信的源
Source: NVD (National Vulnerability Database)
Vulnerability Title
HestiaCP 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
HestiaCP是Hestia Control Panel开源的一个适用于现代网络的轻量级且功能强大的控制面板。 HestiaCP 1.2.0版本至1.9.4版本存在安全漏洞，该漏洞源于IP欺骗漏洞，允许未经身份验证的远程攻击者通过提供任意IP地址绕过身份验证安全控制。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

VendorProductAffected VersionsCPESubscribe
hestiacphestiacp 1.2.0 ~ 1.9.4 -

II. Public POCs for CVE-2026-43634

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Qwen3.6-35B-A3B · 9901 chars
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III. Intelligence Information for CVE-2026-43634

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Patches & Fixes for CVE-2026-43634 (2)

Vendor Advisories for CVE-2026-43634 (1)

Security Blog Posts for CVE-2026-43634 (1)

Other References for CVE-2026-43634 (1)

IV. Related Vulnerabilities

Same product: hestiacp
Same vendor: hestiacp
Same weakness: CWE-348

V. Comments for CVE-2026-43634

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