CVE-2026-43634
HestiaCP 1.2.0-1.9.4 IP Spoofing via CF-Connecting-IP Header
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.
INFO
Published Date :
May 19, 2026, 3:16 p.m.
Last Modified :
July 24, 2026, 12:10 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | |||||
| CVSS 3.1 | HIGH | 83251b91-4cc7-4094-a5c7-464a1b83ea10 | ||||
| CVSS 3.1 | HIGH | [email protected] | ||||
| CVSS 4.0 | HIGH | 83251b91-4cc7-4094-a5c7-464a1b83ea10 | ||||
| CVSS 4.0 | HIGH | [email protected] |
Solution
- Upgrade HestiaCP to version 1.9.5 or later.
- Configure web server to validate CF-Connecting-IP.
- Implement strict checks on incoming IP headers.
- Ensure fail2ban and allowlists are properly configured.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-43634.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-43634 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-43634
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-43634 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-43634 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
CVE Translated by [email protected]
Jul. 24, 2026
Action Type Old Value New Value Added Translation Title: HestiaCP, Description: Las versiones de HestiaCP 1.2.0 a 1.9.4 contienen una vulnerabilidad de suplantación de IP que permite a atacantes remotos no autenticados eludir los controles de seguridad de autenticación al proporcionar una dirección IP arbitraria en el encabezado HTTP CF-Connecting-IP sin verificar que la solicitud se originó en la red de Cloudflare. Los atacantes pueden explotar esto para eludir la protección contra fuerza bruta de fail2ban, eludir las listas de permitidos de IP por usuario, y envenenar los registros de auditoría de autenticación al suplantar direcciones IP confiables en cada solicitud. -
CVE Modified by [email protected]
Jul. 14, 2026
Action Type Old Value New Value Changed Affected [{'repo': 'https://github.com/hestiacp/hestiacp', 'vendor': 'hestiacp', 'product': 'hestiacp', 'versions': [{'status': 'affected', 'version': '1.2.0', 'versionType': 'semver', 'lessThanOrEqual': '1.9.4'}, {'status': 'unaffected', 'version': 'f381e294500f671cf12716c638afd0bfde901f88', 'versionType': 'git'}], 'defaultStatus': 'affected'}] [{'repo': 'https://github.com/hestiacp/hestiacp', 'vendor': 'hestiacp', 'product': 'hestiacp', 'versions': [{'status': 'affected', 'version': '1.2.0', 'versionType': 'semver', 'lessThanOrEqual': '1.9.4'}, {'status': 'unaffected', 'version': 'f381e294500f671cf12716c638afd0bfde901f88', 'versionType': 'git'}], 'packageURL': 'pkg:github/hestiacp/hestiacp', 'defaultStatus': 'affected'}] -
CVE Modified by [email protected]
Jun. 17, 2026
Action Type Old Value New Value Added Affected [{'repo': 'https://github.com/hestiacp/hestiacp', 'vendor': 'hestiacp', 'product': 'hestiacp', 'versions': [{'status': 'affected', 'version': '1.2.0', 'versionType': 'semver', 'lessThanOrEqual': '1.9.4'}, {'status': 'unaffected', 'version': 'f381e294500f671cf12716c638afd0bfde901f88', 'versionType': 'git'}], 'defaultStatus': 'affected'}] -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Jun. 17, 2026
Action Type Old Value New Value Added SSVC {'id': 'CVE-2026-43634', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'poc'}, {'automatable': 'yes'}, {'technicalImpact': 'partial'}], 'version': '2.0.3', 'timestamp': '2026-05-19T16:39:12.742374Z'} -
New CVE Received by [email protected]
May. 19, 2026
Action Type Old Value New Value Added 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. Added CVSS V4.0 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 Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N Added CWE CWE-348 Added Reference https://github.com/hestiacp/hestiacp/commit/f381e294500f671cf12716c638afd0bfde901f88 Added Reference https://github.com/hestiacp/hestiacp/issues/5229 Added Reference https://github.com/hestiacp/hestiacp/pull/5273 Added Reference https://mercuryiss.com.au/hestiacp-unauthenticated-rce-ip-spoofing-cve-2026-43633-cve-2026-43634 Added Reference https://www.vulncheck.com/advisories/hestiacp-ip-spoofing-via-cf-connecting-ip-header