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2 vulnerabilities by presenton
CVE-2026-58446 (GCVE-0-2026-58446)
Vulnerability from nvd – Published: 2026-06-30 21:05 – Updated: 2026-06-30 21:05 X_Open Source
VLAI
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 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).
Severity
6.5 (Medium)
CWE
- CWE-306 - Missing Authentication for Critical Function
Assigner
References
5 references
| URL | Tags |
|---|---|
| https://github.com/presenton/presenton/releases/t… | release-notes |
| https://github.com/presenton/presenton/issues/678 | technical-descriptionexploit |
| https://github.com/presenton/presenton/pull/679 | issue-tracking |
| https://github.com/presenton/presenton/commit/a11… | patch |
| https://www.vulncheck.com/advisories/presenton-be… | third-party-advisory |
Impacted products
Date Public
2026-06-16 00:00
Credits
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CVE-2026-58446 (GCVE-0-2026-58446)
Vulnerability from cvelistv5 – Published: 2026-06-30 21:05 – Updated: 2026-06-30 21:05 X_Open Source
VLAI
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 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).
Severity
6.5 (Medium)
CWE
- CWE-306 - Missing Authentication for Critical Function
Assigner
References
5 references
| URL | Tags |
|---|---|
| https://github.com/presenton/presenton/releases/t… | release-notes |
| https://github.com/presenton/presenton/issues/678 | technical-descriptionexploit |
| https://github.com/presenton/presenton/pull/679 | issue-tracking |
| https://github.com/presenton/presenton/commit/a11… | patch |
| https://www.vulncheck.com/advisories/presenton-be… | third-party-advisory |
Impacted products
Date Public
2026-06-16 00:00
Credits
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"product": "presenton",
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