{"id":"CVE-2026-63329","published":"2026-09-21T19:17:08.290","lastModified":"2026-09-21T19:17:08.290","description":"Warpgate is an open source SSH, HTTPS and MySQL bastion host for Linux. Prior to 0.25.6, copy_server_request in warpgate-protocol-http/src/proxy.rs forwards a client-supplied x-warpgate-username header before inject_own_headers appends the authenticated username. Because the request builder preserves repeated values, a proxied backend that trusts the first x-warpgate-username value can authorize an authenticated attacker as another user. The same forwarding policy also accepts the reserved x-warpgate-authentication-type header, and warpgate-common/src/http_headers.rs does not exclude either reserved identity header. This issue is fixed in version 0.25.6.","cvssScore":4.9,"cvssSeverity":"MEDIUM","cvssVector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:L/I:L/A:N","cwes":["CWE-116","CWE-290"],"vendors":[],"products":[],"references":[{"url":"https://github.com/warp-tech/warpgate/commit/c3748d7585209781b2d3a39ac9941b91d11d9b77","tags":[]},{"url":"https://github.com/warp-tech/warpgate/releases/tag/v0.25.6","tags":[]},{"url":"https://github.com/warp-tech/warpgate/security/advisories/GHSA-862h-v6cc-9757","tags":[]}],"exploitRefs":[{"url":"https://github.com/warp-tech/warpgate/commit/c3748d7585209781b2d3a39ac9941b91d11d9b77","tags":[]},{"url":"https://github.com/warp-tech/warpgate/releases/tag/v0.25.6","tags":[]},{"url":"https://github.com/warp-tech/warpgate/security/advisories/GHSA-862h-v6cc-9757","tags":[]}],"hasPoc":true,"ai":{"summary":"The flaw allows an attacker to authorize themselves as another user by manipulating headers in a proxied request, potentially leading to unauthorized access.","exploitability":"Exploitation requires control over client-supplied headers and a backend that trusts the first x-warpgate-username value; moderate effort needed.","blast_radius":"If exploited, this could lead to significant unauthorized access within the network, affecting multiple users or services.","remediation":"Update Warpgate to version 0.25.6 or later to mitigate the vulnerability.","tags":["auth-bypass","header-manipulation","web-proxy"],"model":"qwen2.5:7b-instruct","analyzedAt":"2026-09-22T06:30:44.308Z"}}