Authorization Flaw in Calcom Cal.diy - PBAC Permission Engine
CVE-2026-104054

5.3MEDIUM

Key Information:

Vendor

Calcom

Status
Cal.diy
Vendor
CVE Published:
2 October 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-104054?

A vulnerability has been identified in Calcom's Cal.diy product, specifically in versions up to 6.2.0. The flaw resides in the function doesUserIdHaveAccessToBooking within the PBAC Permission Engine, which fails to properly enforce access controls. This oversight allows an attacker to initiate unauthorized actions remotely, posing a significant threat to the integrity and security of the affected application. An exploit has been made public, and efforts to patch this vulnerability are in progress.

Affected Version(s)

cal.diy 6.0

cal.diy 6.1

cal.diy 6.2.0

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-2026-104054 - Proof of Concept

References

https://vuldb.com/vuln/412762
vdb-entrytechnical-description
https://vuldb.com/vuln/412762/cti
signaturepermissions-required
https://vuldb.com/cve/CVE-2026-104054
third-party-advisory

CVSS V4

Score:
5.3
Severity:
MEDIUM
Confidentiality:
Low
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

geochen (VulDB User)
VulDB CNA Team
.