---
id: CVE-2026-58446
title: >-
  Presenton < 0.8.8-beta - Authentication Bypass of Session Auth via Unprotected
  MCP Endpoint
summary: >-
  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 th…
severity: medium
cvss: 6.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L'
cvssSource: cna
cwe:
  - CWE-306
vendor: presenton
product: presenton
affected:
  - presenton < 0.8.8-beta
ssvc:
  exploitation: poc
  automatable: 'yes'
  technicalImpact: partial
  timestamp: '2026-07-01T13:58:23.292499Z'
exploitAvailable: true
published: '2026-06-30'
updated: '2026-11-08'
sourceUpdated: '2026-11-08T14:07:00.877Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-58446'
references:
  - url: 'https://github.com/presenton/presenton/releases/tag/electron-v0.8.8-beta'
    label: presenton electron-v0.8.8-beta Release Notes
  - url: 'https://github.com/presenton/presenton/issues/678'
    label: Researcher Disclosure
  - url: 'https://github.com/presenton/presenton/pull/679'
    label: Maintainer PR
  - url: >-
      https://github.com/presenton/presenton/commit/a1103dcef3c761cc8bab44e2862c81a49969abd7
    label: Fix Commit
  - url: >-
      https://www.vulncheck.com/advisories/presenton-beta-authentication-bypass-of-session-auth-via-unprotected-mcp-endpoint
tags:
  - cve.org
  - exploit-available
epss: 0.00703
epssPercentile: 0.5354
ingestedAt: '2026-11-08T14:51:22.294Z'
---

## Overview

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).

## Affected

- `presenton < 0.8.8-beta`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.