{"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"}}]}}