{"api_version":"1","generated_at":"2026-09-23T01:39:29+00:00","cve":"CVE-2026-91166","urls":{"html":"https://cve.report/CVE-2026-91166","api":"https://cve.report/api/cve/CVE-2026-91166.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-91166","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-91166"},"summary":{"title":"Warpgate: Web SSH stores a jump host's key against the target's address, so it validates as the target","description":"Warpgate is an open source SSH, HTTPS and MySQL bastion host for Linux. From 0.25.0 until 0.27.6, the browser SSH path in warpgate-web-ssh/src/manager.rs handles RCEvent::HostKeyUnknown without the presenting hop identity and instead passes ssh_options.host and ssh_options.port for the final target to KnownHosts::trust. In Prompt and AutoAccept modes, a jump host key can therefore be stored for the target address. A machine later presenting the jump host key at the target address can be accepted as the target, allowing interception of user traffic and a newly issued certificate when certificate authentication is used. The native SSH path is unaffected because it tracks each hop separately. This issue is fixed in version 0.27.6.","state":"PUBLISHED","assigner":"GitHub_M","published_at":"2026-09-21 19:17:15","updated_at":"2026-09-21 19:17:15"},"problem_types":["CWE-297","CWE-923","CWE-297 CWE-297: Improper Validation of Certificate with Host Mismatch","CWE-923 CWE-923: Improper Restriction of Communication Channel to Intended Endpoints"],"metrics":[{"version":"3.1","source":"security-advisories@github.com","type":"Secondary","score":"5.7","severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:H/I:H/A:N","data":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:H/I:H/A:N","baseScore":5.7,"baseSeverity":"MEDIUM","attackVector":"NETWORK","attackComplexity":"HIGH","privilegesRequired":"HIGH","userInteraction":"REQUIRED","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"NONE"}},{"version":"3.1","source":"CNA","type":"DECLARED","score":"5.7","severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:H/I:H/A:N","data":{"attackComplexity":"HIGH","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":5.7,"baseSeverity":"MEDIUM","confidentialityImpact":"HIGH","integrityImpact":"HIGH","privilegesRequired":"HIGH","scope":"UNCHANGED","userInteraction":"REQUIRED","vectorString":"CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:H/I:H/A:N","version":"3.1"}}],"references":[{"url":"https://github.com/warp-tech/warpgate/security/advisories/GHSA-w9jj-vpw3-5r8f","name":"https://github.com/warp-tech/warpgate/security/advisories/GHSA-w9jj-vpw3-5r8f","refsource":"security-advisories@github.com","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://github.com/warp-tech/warpgate/releases/tag/v0.27.6","name":"https://github.com/warp-tech/warpgate/releases/tag/v0.27.6","refsource":"security-advisories@github.com","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://github.com/warp-tech/warpgate/commit/fb66ff74f979c22054f4d348cc0d9065cc67e5d3","name":"https://github.com/warp-tech/warpgate/commit/fb66ff74f979c22054f4d348cc0d9065cc67e5d3","refsource":"security-advisories@github.com","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-91166","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-91166","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"warp-tech","product":"warpgate","version":"affected >= 0.25.0, < 0.27.6","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":{"cve_year":"2026","cve_id":"91166","cve":"CVE-2026-91166","epss":"0.001720000","percentile":"0.069250000","score_date":"2026-09-22","updated_at":"2026-09-23 00:06:34"},"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"product":"warpgate","vendor":"warp-tech","versions":[{"status":"affected","version":">= 0.25.0, < 0.27.6"}]}],"descriptions":[{"lang":"en","value":"Warpgate is an open source SSH, HTTPS and MySQL bastion host for Linux. 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From 0.25.0 until 0.27.6, the browser SSH path in warpgate-web-ssh/src/manager.rs handles RCEvent::HostKeyUnknown without the presenting hop identity and instead passes ssh_options.host and ssh_options.port for the final target to KnownHosts::trust. In Prompt and AutoAccept modes, a jump host key can therefore be stored for the target address. A machine later presenting the jump host key at the target address can be accepted as the target, allowing interception of user traffic and a newly issued certificate when certificate authentication is used. The native SSH path is unaffected because it tracks each hop separately. This issue is fixed in version 0.27.6.","Type":"Description","Title":"Warpgate: Web SSH stores a jump host's key against the target's "}]}}}