{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "introduced": "0"
              },
              {
                "fixed": "0.27.6"
              }
            ],
            "source": [
              "AFFECTED_FIELD",
              "REFERENCES"
            ]
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "e94425a08f501383a67316673749dcbd637c6ce3"
            },
            {
              "fixed": "3f166ef2fb27d3e6785df315fdc39914f0568404"
            }
          ],
          "repo": "https://github.com/warp-tech/warpgate",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-vvpj-p7j8-4rv4"
  ],
  "database_specific": {
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
      "CWE-79"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/91xxx/CVE-2026-91165.json"
  },
  "details": "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.",
  "id": "CVE-2026-91165",
  "modified": "2026-09-23T03:30:58.716623761Z",
  "published": "2026-09-21T18:53:03.854Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/warp-tech/warpgate/releases/tag/v0.27.6"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/91xxx/CVE-2026-91165.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/warp-tech/warpgate/security/advisories/GHSA-vvpj-p7j8-4rv4"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-91165"
    },
    {
      "type": "FIX",
      "url": "https://github.com/warp-tech/warpgate/commit/e94425a08f501383a67316673749dcbd637c6ce3"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:N/I:L/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Warpgate: Markup injection in SSO form_post return page via unencoded redirect/error values"
}