Dashboard / CVE-2026-43634

CVE-2026-43634

HIGH
MEDIUM Priority: 0.02 BB Relevance: 77/100
Published: 2026-05-19 Modified: 2026-11-08 First seen: 2026-11-08 Status: active

Attack Surface

Network Low Complexity No Auth No Interaction Integ. Impact

CVSS Vector Breakdown

AV: Network
AC: Low
PR: None
UI: None
AT: None
VC: None
VI: High
VA: None

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.

Weakness Classification (1)

Affected Software (1)

VendorProductVersion
hestiacp hestiacp 1.2.0

References & Advisories (5)

Bug Bounty Relevance

77 / 100
✓ Network accessible
✓ No authentication
✓ Low complexity
✓ No user interaction

CVSS Score

8.7 / 10.0 v4.0
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N

EPSS — Exploitation Probability

0.24%
Raw Score 0.002410
Percentile 15.4%
Date 2026-11-13

EPSS Trend

2026-11-13
0.00241
2026-11-12
0.00241
2026-11-10
0.00241
2026-11-09
0.00241
2026-11-08
0.00241

Intelligence Sources

mitre ref →

External Links