{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "introduced": "0"
              },
              {
                "fixed": "0.8.8-beta"
              }
            ],
            "source": [
              "DESCRIPTION",
              "REFERENCES"
            ]
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "c1cdd7b8d0c922621e65094aaaebde4fbeb89095"
            },
            {
              "fixed": "a1103dcef3c761cc8bab44e2862c81a49969abd7"
            }
          ],
          "repo": "https://github.com/presenton/presenton",
          "type": "GIT"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "VulnCheck",
    "cwe_ids": [
      "CWE-306"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/58xxx/CVE-2026-58446.json"
  },
  "details": "Presenton before 0.8.8-beta bundles an MCP server that, on server/Docker deployments configured with session authentication (AUTH_USERNAME/AUTH_PASSWORD), is reachable unauthenticated at /mcp because the nginx front-end does not apply the auth_request gate to that path and the MCP server auto-mints a valid internal session token for the configured user. A remote unauthenticated attacker can invoke MCP tools such as generate_presentation, performing authenticated application actions, consuming the operators configured LLM API keys, and creating presentations in the operators instance. The Electron desktop build is not affected (MCP disabled).",
  "id": "CVE-2026-58446",
  "modified": "2026-07-16T03:31:02.713724508Z",
  "published": "2026-06-30T21:05:15.949Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/58xxx/CVE-2026-58446.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/presenton/presenton/releases/tag/electron-v0.8.8-beta"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-58446"
    },
    {
      "type": "ADVISORY",
      "url": "https://www.vulncheck.com/advisories/presenton-beta-authentication-bypass-of-session-auth-via-unprotected-mcp-endpoint"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/presenton/presenton/pull/679"
    },
    {
      "type": "FIX",
      "url": "https://github.com/presenton/presenton/commit/a1103dcef3c761cc8bab44e2862c81a49969abd7"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/presenton/presenton"
    },
    {
      "type": "EVIDENCE",
      "url": "https://github.com/presenton/presenton/issues/678"
    }
  ],
  "schema_version": "1.8.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Presenton \u003c 0.8.8-beta - Authentication Bypass of Session Auth via Unprotected MCP Endpoint"
}