Warp-Tech Warpgate up to 0.27.5 SSO Return Path sso_provider_list.rs ReturnToSsoPostResponse Next redirect

Summaryinfo

A vulnerability described as problematic has been identified in Warp-Tech Warpgate up to 0.27.5. This vulnerability affects the function ReturnToSsoPostResponse of the file warpgate-protocol-http/src/api/sso_provider_list.rs of the component SSO Return Path. Such manipulation of the argument Next leads to redirect. This vulnerability is traded as CVE-2026-91165. The attack may be launched remotely. There is no exploit available. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability, which was classified as problematic, has been found in Warp-Tech Warpgate up to 0.27.5. Affected by this issue is the function ReturnToSsoPostResponse of the file warpgate-protocol-http/src/api/sso_provider_list.rs of the component SSO Return Path. The manipulation of the argument next with an unknown input leads to a redirect vulnerability. Using CWE to declare the problem leads to CWE-601. A web application accepts a user-controlled input that specifies a link to an external site, and uses that link in a Redirect. This simplifies phishing attacks. Impacted is integrity. CVE summarizes:

Warpgate is an open source SSH, HTTPS and MySQL bastion host for Linux. Prior to 0.27.6, the response_mode=form_post SSO return path in warpgate-protocol-http/src/api/sso_provider_list.rs uses serde_json::to_string inside ReturnToSsoPostResponse without neutralizing a script-closing sequence. The vulnerable value can enter the script block through the attacker-controlled next redirect parameter stored by warpgate-protocol-http/src/api/sso_provider_detail.rs or through IdP-derived error messages that make_redirect_url concatenates without URL encoding. The IdP-derived path is reachable when the attacker controls a configured identity provider, or when the attacker controls the email or username claim on an attacker-controlled account and the configured identity provider permits the required unvalidated claim format. A victim must complete the form_post SSO flow for the injected markup to be rendered. The Warpgate Content-Security-Policy blocks injected JavaScript and event handlers, so the demonstrated impact is content spoofing, a false login form, or a meta refresh rather than script execution. This issue is fixed in version 0.27.6.

The advisory is shared for download at github.com. This vulnerability is handled as CVE-2026-91165 since 09/14/2026. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. Successful exploitation requires user interaction by the victim. There are known technical details, but no exploit is available. The MITRE ATT&CK project declares the attack technique as T1204.001.

Upgrading to version 0.27.6 eliminates this vulnerability.

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Productinfo

Vendor

• Warp-Tech

Name

• Warpgate

Version

• 0.27.0
• 0.27.1
• 0.27.2
• 0.27.3
• 0.27.4
• 0.27.5

Website

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

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