warp-tech Warpgate up to 0.28.x Kubernetes Request Correlator correlator.rs close improper authorization

Summaryinfo

A vulnerability categorized as critical has been discovered in warp-tech Warpgate up to 0.28.x. This impacts the function KubernetesSessionHandle::close of the file warpgate-protocol-kubernetes/src/correlator.rs of the component Kubernetes Request Correlator. Executing a manipulation can lead to improper authorization. This vulnerability is registered as CVE-2026-91168. It is possible to launch the attack remotely. No exploit is available. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability classified as critical was found in warp-tech Warpgate up to 0.28.x. This vulnerability affects the function KubernetesSessionHandle::close of the file warpgate-protocol-kubernetes/src/correlator.rs of the component Kubernetes Request Correlator. 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, integrity, and availability. CVE summarizes:

Warpgate is an open source SSH, HTTPS, and MySQL bastion host for Linux. From 0.21.0 until 0.29.0, the Kubernetes request correlator in warpgate-protocol-kubernetes/src/correlator.rs keys an authorized AdmittedTarget by username, target_name, and client IP rather than by the immutable user UUID, while KubernetesSessionHandle::close does not evict the entry. If an account is deleted and a different low-privilege account is created with the same username, the replacement account can successfully authenticate as that recreated username and reuse the predecessor's still-live correlation entry when requesting the same target from the same client IP before kubernetes.session_max_age expires. Current-request authentication still occurs, but the reused entry bypasses a fresh target authorization check and can cause Warpgate to proxy requests with Kubernetes target credentials that the replacement account is not authorized to use, exposing cluster resources or permitting unauthorized mutations. This issue is fixed in version 0.29.0.

The advisory is available at github.com. This vulnerability was named CVE-2026-91168 since 09/14/2026. The exploitation appears to be easy. The attack can be initiated remotely. Technical details are known, but there is no available exploit. This vulnerability is assigned to T1548.002 by the MITRE ATT&CK project.

Upgrading to version 0.29.0 eliminates this vulnerability.

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Productinfo

Vendor

• warp-tech

Name

• Warpgate

Version

• 0.1
• 0.2
• 0.3
• 0.4
• 0.5
• 0.6
• 0.7
• 0.8
• 0.9
• 0.10
• 0.11
• 0.12
• 0.13
• 0.14
• 0.15
• 0.16
• 0.17
• 0.18
• 0.19
• 0.20
• 0.21
• 0.22
• 0.23
• 0.24
• 0.25
• 0.26
• 0.27
• 0.28

Website

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

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