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Wednesday, 28 October 2026
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Incident database

CVE-2026-58446: Presenton MCP endpoint bypasses session authentication

Presenton before 0.8.8-beta exposed its bundled MCP server unauthenticated at /mcp because the nginx front-end did not apply the auth_request gate and the MCP server auto-minted a valid internal session token. Remote unauthenticated attackers could invoke MCP tools such as generate_presentation, consuming the operator's LLM API keys and creating presentations in their instance.

Disclosed 30 June 2026 · Record updated 1 October 2026

Impact

Remote unauthenticated attackers could perform authenticated application actions via MCP tools, consume the operator's configured LLM API keys and create presentations in the operator's instance. Server/Docker deployments using session authentication were affected; the Electron desktop build was not.

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Sources

  1. nvd.nist.govhttps://nvd.nist.gov/vuln/detail/CVE-2026-58446