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    CVE-2026-43634

    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.

    Published:May 19, 2026
    Last Modified:May 19, 2026
    EPS:May 19, 2026
    EPSS Score:
    CVSS Score:7.5

    Affected Products

    Vendor
    Hestiacp
    Product
    Hestiacp

    Exploits

    No exploit reference

    Common Weakness Enumeration

    CWE-348 Use of Less Trusted Source

    Related CVEs

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    CVE-2026-12196 (CVSS 8.3) — HestiaCP panel cronjob feature is affected by a broken access control vulnerability. Low privilege users can m…
    CVE-2026-43633 (CVSS 9.5) — HestiaCP versions 1.9.0 through 1.9.4 contain a deserialization vulnerability in the web terminal component ca…
    CVE-2023-4517 (CVSS 5.4) — Cross-site Scripting (XSS) - Stored in GitHub repository hestiacp/hestiacp prior to 1.8.6.…
    CVE-2023-5084 (CVSS 3.9) — Cross-site Scripting (XSS) - Reflected in GitHub repository hestiacp/hestiacp prior to 1.8.8. …
    CVE-2023-3479 (CVSS 6.1) — Cross-site Scripting (XSS) - Reflected in GitHub repository hestiacp/hestiacp prior to 1.7.8.…
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    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High