{
    "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"
                }
            }
        ]
    }
}