Warp-Tech Warpgate up to 0.27.2 HTTP API Token Authentication common.rs UserToken improper authorization

Summaryinfo

A vulnerability was found in Warp-Tech Warpgate up to 0.27.2. It has been classified as problematic. The impacted element is the function RequestAuthorization::UserToken of the file warpgate-protocol-http/src/common.rs of the component HTTP API Token Authentication. This manipulation causes improper authorization. This vulnerability is tracked as CVE-2026-91164. The attack is possible to be carried out remotely. No exploit exists. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability has been found in Warp-Tech Warpgate up to 0.27.2 and classified as problematic. Affected by this vulnerability is the function RequestAuthorization::UserToken of the file warpgate-protocol-http/src/common.rs of the component HTTP API Token Authentication. The manipulation with an unknown input leads to a improper authorization vulnerability. The CWE definition for the vulnerability is CWE-285. The product does not perform or incorrectly performs an authorization check when an actor attempts to access a resource or perform an action. As an impact it is known to affect confidentiality. The summary by CVE is:

Warpgate is an open source SSH, HTTPS and MySQL bastion host for Linux. From 0.23.0 until 0.27.3, HTTP API token authentication resolves ConfigProvider::validate_api_token into RequestAuthorization::UserToken without enforcing the owning user's allowed_ip_ranges against the trusted client address in warpgate-protocol-http/src/common.rs. An attacker holding a leaked, phished, or exfiltrated X-Warpgate-Token can therefore use it from a prohibited network location. Deployments without allowed_ip_ranges are unaffected, and HTTP target proxying plus SSH, MySQL, PostgreSQL, RDP, VNC, and Kubernetes paths do not accept this vulnerable HTTP token flow. This issue is fixed in version 0.27.3.

The advisory is shared at github.com. This vulnerability is known as CVE-2026-91164 since 09/14/2026. The exploitation appears to be easy. The attack can be launched remotely. Technical details are known, but no exploit is available. MITRE ATT&CK project uses the attack technique T1548.002 for this issue.

Upgrading to version 0.27.3 eliminates this vulnerability.

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Vendor

• Warp-Tech

Name

• Warpgate

Version

• 0.27.0
• 0.27.1
• 0.27.2

Website

• Product: https://github.com/warp-tech/warpgate/

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Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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