CVE-2026-63329

4.9 MEDIUMpublic exploit available

Published 2026-09-21 · Updated 2026-09-21

AI risk analysis

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.
Prioritized remediation: Update Warpgate to version 0.25.6 or later to mitigate the vulnerability.

auth-bypassheader-manipulationweb-proxy

Analysis generated locally by qwen2.5:7b-instruct (no data left the box). AI-assisted — verify against primary sources before acting.

NVD 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.

CVSS vector

CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:L/I:L/A:N

Weaknesses

CWE-116, CWE-290

Public exploit & PoC references

All references

Source data: NVD (nvd.nist.gov), public domain. Exploit-DB.ai adds local AI analysis for defensive use only.

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