{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-91165", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "state": "PUBLISHED", "assignerShortName": "GitHub_M", "dateReserved": "2026-09-14T21:20:41.196Z", "datePublished": "2026-09-21T18:53:03.854Z", "dateUpdated": "2026-09-21T19:26:22.695Z"}, "containers": {"cna": {"title": "Warpgate: Markup injection in SSO form_post return page via unencoded redirect/error values", "problemTypes": [{"descriptions": [{"cweId": "CWE-79", "lang": "en", "description": "CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')", "type": "CWE"}]}], "metrics": [{"cvssV3_1": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 2.4, "baseSeverity": "LOW", "confidentialityImpact": "NONE", "integrityImpact": "LOW", "privilegesRequired": "HIGH", "scope": "UNCHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:N/I:L/A:N", "version": "3.1"}}], "references": [{"name": "https://github.com/warp-tech/warpgate/security/advisories/GHSA-vvpj-p7j8-4rv4", "tags": ["x_refsource_CONFIRM"], "url": "https://github.com/warp-tech/warpgate/security/advisories/GHSA-vvpj-p7j8-4rv4"}, {"name": "https://github.com/warp-tech/warpgate/commit/e94425a08f501383a67316673749dcbd637c6ce3", "tags": ["x_refsource_MISC"], "url": "https://github.com/warp-tech/warpgate/commit/e94425a08f501383a67316673749dcbd637c6ce3"}, {"name": "https://github.com/warp-tech/warpgate/releases/tag/v0.27.6", "tags": ["x_refsource_MISC"], "url": "https://github.com/warp-tech/warpgate/releases/tag/v0.27.6"}], "affected": [{"vendor": "warp-tech", "product": "warpgate", "versions": [{"version": "< 0.27.6", "status": "affected"}]}], "providerMetadata": {"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2026-09-21T18:53:03.854Z"}, "descriptions": [{"lang": "en", "value": "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."}], "source": {"advisory": "GHSA-vvpj-p7j8-4rv4", "discovery": "UNKNOWN"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-09-21T19:26:11.810922Z", "id": "CVE-2026-91165", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-09-21T19:26:22.695Z"}}]}}

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