CVE WatchJul 14, 2026

CVE-2026-43634

HestiaCP versions 1.2.0 through 1.9.4 contain an IP spoofing vulnerability that allows unauthenticated remote attackers to bypass authentica

CVSS

7.5

High

EPSS

0.2%

p15

KEV

—

Exploit Today

0-100

Published: May 19, 2026 · Last modified: Jul 14, 2026 · CWE-348

EPSS · 30d

0.2%EPSS · 30 days0.2%

2026-06-302026-07-16

Technical 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.

Official references

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