What is CVE-2026-43634?

CVE-2026-43634 is a high-severity vulnerability in Hestiacp, classified under CWE-348. CVSS score: 7.5/10. Published 2026-05-19.

How severe is CVE-2026-43634?

High severity. CVSS v3 base score is 7.5 out of 10.

Vulnerability in Hestiacp

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 wit…

EPSS: 0.001 (18.1th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N.

Affected products

Hestiacp — versions 1.2.0, f381e294500f671cf12716c638afd0bfde901f88

Weakness classification (CWE)

CWE-348

References

disclosure@vulncheck.com (technical-description, exploit)
disclosure@vulncheck.com (issue-tracking)
disclosure@vulncheck.com (issue-tracking)
disclosure@vulncheck.com (patch)
disclosure@vulncheck.com (third-party-advisory)

Frequently asked questions

What is CVE-2026-43634?: CVE-2026-43634 is a high-severity vulnerability in Hestiacp, classified under CWE-348. CVSS score: 7.5/10. Published 2026-05-19.
How severe is CVE-2026-43634?: High severity. CVSS v3 base score is 7.5 out of 10.