CVE-2026-63329 (GCVE-0-2026-63329)
Vulnerability from cvelistv5 – Published: 2026-09-21 18:49 – Updated: 2026-09-22 15:40
VLAI
EPSS
VEX
Title
Warpgate: x-warpgate-username Header Not Stripped from Client Requests Enables Identity Spoofing to WebSocket Backend Targets
Summary
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.
Severity
4.9 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-22 14:12 UTC
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://github.com/warp-tech/warpgate/security/ad… | x_refsource_CONFIRM |
| https://github.com/warp-tech/warpgate/commit/c374… | x_refsource_MISC |
| https://github.com/warp-tech/warpgate/releases/ta… | x_refsource_MISC |
Impacted products
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The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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