Presenton < 0.8.8-beta - Authentication Bypass of Session Auth via Unprotected MCP Endpoint_CVE-2026-58446

{
    "lastseen": "",
    "description": "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).",
    "published": "2026-06-30T21:05:15.949Z",
    "modified": "2026-06-30T21:05:15.949Z",
    "type": "cve",
    "title": "Presenton < 0.8.8-beta - Authentication Bypass of Session Auth via Unprotected MCP Endpoint",
    "source": "VulnCheck",
    "references": "https://github.com/presenton/presenton/releases/tag/electron-v0.8.8-beta\nhttps://github.com/presenton/presenton/issues/678\nhttps://github.com/presenton/presenton/pull/679\nhttps://github.com/presenton/presenton/commit/a1103dcef3c761cc8bab44e2862c81a49969abd7\nhttps://www.vulncheck.com/advisories/presenton-beta-authentication-bypass-of-session-auth-via-unprotected-mcp-endpoint",
    "id": "CVE-2026-58446",
    "bulletinFamily": "",
    "cwe": [
        "CWE-306"
    ],
    "cvelist": null,
    "sourceData": "presenton presenton 0",
    "sourceHref": "",
    "cvss": {
        "score": 6.5,
        "severity": "MEDIUM",
        "vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L",
        "version": "3.1"
    },
    "cvss2": [],
    "cvss3": {
        "version": "",
        "vectorString": "",
        "baseScore": 0,
        "baseSeverity": "",
        "attackVector": "",
        "attackComplexity": "",
        "privilegesRequired": "",
        "userInteraction": "",
        "scope": "",
        "confidentialityImpact": "",
        "integrityImpact": "",
        "availabilityImpact": "",
        "cvssV3": {
            "version": "",
            "vectorString": "",
            "baseScore": 0,
            "baseSeverity": "",
            "attackVector": "",
            "attackComplexity": "",
            "privilegesRequired": "",
            "userInteraction": "",
            "scope": "",
            "confidentialityImpact": "",
            "integrityImpact": "",
            "availabilityImpact": ""
        }
    },
    "href": "",
    "category_name": "CVE",
    "post_link": "",
    "product": "presenton",
    "version": "0",
    "vendor": "presenton",
    "ai_description": "",
    "ai_severity": "",
    "ai_vendor": "",
    "ai_product": "",
    "ai_version": "",
    "ai_score": 0
}