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CVE-2026-91166— Warpgate: Web SSH stores a jump host's key against the target's address, so it validates as the target

Quick assessment

Affected
warp-tech warpgate
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

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 an

CVSS 5.7 · Medium EPSS 0.17% · P7

Affected Version Matrix 1

VendorProduct Version RangeStatus
warp-tech warpgate >= 0.25.0, < 0.27.6 affected
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I. Basic Information for CVE-2026-91166

Vulnerability Information

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Vulnerability Title
Warpgate: Web SSH stores a jump host's key against the target's address, so it validates as the target
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:H/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
对宿主不匹配的证书验证不恰当
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
warp-tech warpgate >= 0.25.0, < 0.27.6 -

II. Public POCs for CVE-2026-91166

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III. Intelligence Information for CVE-2026-91166

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Patches & Fixes for CVE-2026-91166 (1)

Other References for CVE-2026-91166 (2)

Same Patch Batch · warp-tech · 2026-09-21 · 7 CVEs total

CVE-2026-58491 9.3 CRITICAL Warpgate: Reflected XSS in SSO return endpoint via attacker-controlled next parameter
CVE-2026-63330 7.7 HIGH Warpgate: Missing Admin Authorization on Live Recording Stream WebSocket Allows Any Authen
CVE-2026-91167 6.0 MEDIUM Warpgate: Missing authorization check on `PUT /users/:id/roles/:role_id` allows any admin
CVE-2026-63329 4.9 MEDIUM Warpgate: x-warpgate-username Header Not Stripped from Client Requests Enables Identity Sp
CVE-2026-91164 4.3 MEDIUM Warpgate: API tokens bypass the user's allowed_ip_ranges restriction
CVE-2026-91165 2.4 LOW Warpgate: Markup injection in SSO form_post return page via unencoded redirect/error value

IV. Related Vulnerabilities

Same product: warpgate
Same vendor: warp-tech
Same weakness: CWE-297

V. Comments for CVE-2026-91166

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