QwikSec

Security Database

CVE

CWE

Training

CVE Database
/

CVE-2026-43634

Back to search

CVE-2026-43634

Published: May 19, 2026

Modified: May 19, 2026

PUBLISHED

CVSS v3.1

7.5

HIGH

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.

VendorProductVersions

hestiacp

hestiacp

affected
1.2.0 - <= 1.9.4
unaffected
f381e294500f671cf12716c638afd0bfde901f88

Weaknesses (CWE)

CWE-348

CVSS v3.1 Details

CVSS v3.1 Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

High

Availability

None

References

Security Training

Train your team to recognize and prevent security threats with our comprehensive security awareness program.

Start Training

Vulnerability Scanning

Discover vulnerabilities in your applications and infrastructure before attackers do.

Scan Now