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    "cveMetadata": {
        "cveId": "CVE-2026-43634",
        "assignerOrgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10",
        "state": "PUBLISHED",
        "assignerShortName": "VulnCheck",
        "dateReserved": "2026-05-01T18:22:45.641Z",
        "datePublished": "2026-05-19T13:33:08.825Z",
        "dateUpdated": "2026-07-14T20:01:11.127Z"
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            "title": "HestiaCP 1.2.0-1.9.4 IP Spoofing via CF-Connecting-IP Header",
            "descriptions": [
                {
                    "lang": "en",
                    "value": "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."
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            "datePublic": "2026-03-09T00:00:00.000Z",
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                            "lang": "en",
                            "cweId": "CWE-348",
                            "description": "Use of Less Trusted Source",
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                    "vendor": "hestiacp",
                    "product": "hestiacp",
                    "repo": "https://github.com/hestiacp/hestiacp",
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                            "status": "affected",
                            "version": "1.2.0",
                            "lessThanOrEqual": "1.9.4",
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                            "status": "unaffected",
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                        "attackRequirements": "NONE",
                        "privilegesRequired": "NONE",
                        "userInteraction": "NONE",
                        "vulnConfidentialityImpact": "NONE",
                        "subConfidentialityImpact": "NONE",
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                        "subIntegrityImpact": "NONE",
                        "vulnAvailabilityImpact": "NONE",
                        "subAvailabilityImpact": "NONE",
                        "exploitMaturity": "NOT_DEFINED",
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                        "Automatable": "NOT_DEFINED",
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                        "valueDensity": "NOT_DEFINED",
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            ],
            "references": [
                {
                    "url": "https://mercuryiss.com.au/hestiacp-unauthenticated-rce-ip-spoofing-cve-2026-43633-cve-2026-43634",
                    "tags": [
                        "technical-description",
                        "exploit"
                    ]
                },
                {
                    "url": "https://github.com/hestiacp/hestiacp/issues/5229",
                    "tags": [
                        "issue-tracking"
                    ]
                },
                {
                    "url": "https://github.com/hestiacp/hestiacp/pull/5273",
                    "tags": [
                        "issue-tracking"
                    ]
                },
                {
                    "url": "https://github.com/hestiacp/hestiacp/commit/f381e294500f671cf12716c638afd0bfde901f88",
                    "tags": [
                        "patch"
                    ]
                },
                {
                    "url": "https://www.vulncheck.com/advisories/hestiacp-ip-spoofing-via-cf-connecting-ip-header",
                    "tags": [
                        "third-party-advisory"
                    ]
                }
            ],
            "credits": [
                {
                    "lang": "en",
                    "value": "sutol",
                    "type": "finder"
                },
                {
                    "lang": "en",
                    "value": "divinity76",
                    "type": "remediation developer"
                }
            ],
            "source": {
                "discovery": "EXTERNAL"
            },
            "x_generator": {
                "engine": "vulncheck"
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        },
        "adp": [
            {
                "metrics": [
                    {
                        "other": {
                            "type": "ssvc",
                            "content": {
                                "timestamp": "2026-05-19T16:39:12.742374Z",
                                "id": "CVE-2026-43634",
                                "options": [
                                    {
                                        "Exploitation": "poc"
                                    },
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                                        "Automatable": "yes"
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                                        "Technical Impact": "partial"
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                                ],
                                "role": "CISA Coordinator",
                                "version": "2.0.3"
                            }
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                ],
                "title": "CISA ADP Vulnrichment",
                "providerMetadata": {
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                    "dateUpdated": "2026-05-19T16:39:31.444Z"
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}