CVE-2026-43634
HighCVSS 7.5Exploitation Probability (EPSS)
Low risk15th percentile - higher than 15% of all known CVEs
Summary
HestiaCP versions 1.2.0 through 1.9.4 have 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 header without verifying the request originated from Cloudflare.
Risk Assessment
Attackers can bypass fail2ban brute-force protection, circumvent per-user IP allowlists, and poison authentication audit logs by spoofing trusted IP addresses.
Recommendation
Update HestiaCP to version 1.9.5 or later, which fixes this vulnerability.
Other vulnerabilities in HestiaCP
See all- CVE-2026-43633Critical
HestiaCP versions 1.9.0 through 1.9.4 contain a deserialization vulnerability in the web terminal component caused by a session format mismatch between PHP and Node.js. This allows unauthenticated remote attackers to achieve root-level code execution by injecting crafted data into HTTP headers.
- CVE-2025-30008Medium
HestiaCP before version 1.9.5 has a stored cross-site scripting vulnerability. Authenticated low-privilege users can inject arbitrary HTML/JavaScript by creating a DNS record with a double quote and script payload in the value field. The application fails to encode the value with htmlspecialchars() in list_dns_rec.php, allowing the payload to execute in browsers of other users, including administrators.
- CVE-2025-30007High
HestiaCP before version 1.9.5 contains an authenticated OS command injection vulnerability that allows low-privilege authenticated users to execute arbitrary commands as root by injecting a single-quote character into unvalidated DNS record types. Attackers can exploit insufficient input validation in is_dns_record_format_valid() combined with unsafe eval-based parsing in update_dns_zone() to prematurely close a variable assignment string and achieve full root code execution on the underlying host in a single DNS record creation step.
- CVE-2026-12196High
HestiaCP panel contains a broken access control vulnerability in the cronjob feature. Low privilege users can modify panel cronjobs to execute HestiaCP management scripts with passwordless sudo.
Original NVD description (English source)
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.