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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

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)

Affected Products

VendorProductAffected VersionsCPESubscribe
hestiacphestiacp 1.2.0 ~ 1.9.4 -

II. Public POCs for CVE-2026-43634

#POC DescriptionSource LinkShenlong Link
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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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IV. Related Vulnerabilities

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

V. Comments for CVE-2026-43634

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