Authentication Bypass in Presenton before 0.8.8-beta
CVE-2026-58446

6.9MEDIUM

Key Information:

Vendor

Presenton

Status
Presenton
Vendor
CVE Published:
30 June 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-58446?

A security flaw in Presenton versions prior to 0.8.8-beta allows an unauthenticated remote attacker to access the MCP server at an unsecured endpoint. This issue stems from the nginx front-end failing to enforce authentication on the /mcp path. As a result, attackers can exploit the server to invoke various MCP tools, such as generating presentations, and use legitimate internal session tokens for sensitive operations, potentially leading to unauthorized access to the application and misuse of API keys.

Affected Version(s)

presenton 0 < 0.8.8-beta

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2026-58446 - Proof of Concept

References

https://github.com/presenton/presenton/releases/tag/elect...
release-notes
https://github.com/presenton/presenton/issues/678
technical-descriptionexploit
https://github.com/presenton/presenton/pull/679
issue-tracking

CVSS V4

Score:
6.9
Severity:
MEDIUM
Confidentiality:
None
Integrity:
Low
Availability:
Low
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

George Chen
.