CVE-2026-43634

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Source

https://cve.org/CVERecord?id=CVE-2026-43634

Import Source

https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-43634.json

JSON Data

https://api.osv.dev/v1/vulns/CVE-2026-43634

Published

2026-05-19T13:33:08Z

Modified

2026-10-28T02:31:14Z

Severity

8.7 (High) CVSS_V4 - 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 CVSS Calculator

Summary

HestiaCP 1.2.0-1.9.4 IP Spoofing via CF-Connecting-IP Header

Details

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.

Database specific

{
    "cna_assigner":  "VulnCheck",
    "cwe_ids":  [
        "CWE-348"
    ],
    "osv_generated_from":  "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/43xxx/CVE-2026-43634.json"
}

References

Affected packages

Git / github.com/hestiacp/hestiacp

Affected ranges

Type

GIT

Repo

https://github.com/hestiacp/hestiacp

Events

Introduced

8e399f2ab2227dd31d38cebebb738b163534c8d5

Fixed

f381e294500f671cf12716c638afd0bfde901f88

Database specific

Show details

{
    "extracted_events":  [
        {
            "range":  [
                {
                    "introduced":  "1.2.0"
                },
                {
                    "last_affected":  "1.9.4"
                }
            ],
            "source":  "AFFECTED_FIELD",
            "strategy":  "StandardRange"
        },
        {
            "range":  [
                {
                    "fixed":  "f381e294500f671cf12716c638afd0bfde901f88"
                }
            ],
            "source":  "REFERENCES_COMMIT"
        }
    ]
}

Affected versions

1.*

1.2.0

1.4.0

1.4.1

1.4.10

1.4.11

1.4.12

1.4.13

1.4.14

1.4.2

1.4.3

1.4.4

1.4.5

1.4.6

1.4.7

1.4.8

1.4.9

1.5.0

1.7.0

1.8.0

1.9.0

1.9.1

Database specific

source

"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-43634.json"