Information Disclosure in CalCom's Generic React API Component
CVE-2026-9349

6.9MEDIUM

Key Information:

Vendor

Calcom

Status
Cal.diy
Vendor
CVE Published:
24 May 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-9349?

A serious information disclosure vulnerability exists in CalCom's Generic React API within the function getServerSideProps. Specifically, the issue arises from the manipulation of arguments such as cancelledBy and rescheduledBy in the file apps/web/modules/bookings/views/bookings-single-view.getServerSideProps.tsx. This weakness permits attackers to gain unauthorized access to sensitive information, which can be exploited remotely. Despite prior notification regarding this vulnerability, the vendor has not responded, illustrating the urgency for users to upgrade to secure versions.

Affected Version(s)

cal.diy 4.9.0

cal.diy 4.9.1

cal.diy 4.9.2

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-2026-9349 - Proof of Concept

References

https://vuldb.com/vuln/365312
vdb-entrytechnical-description
https://vuldb.com/vuln/365312/cti
signaturepermissions-required
https://vuldb.com/submit/812177
third-party-advisory

CVSS V4

Score:
6.9
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
None
Availability:
None
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

Eric-z (VulDB User)
VulDB CNA Team
.