Cross-Site Request Forgery in calcom cal.diy Affects Multiple Versions
CVE-2026-9303

5.3MEDIUM

Key Information:

Vendor

Calcom

Status
Cal.diy
Vendor
CVE Published:
23 May 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-9303?

A vulnerability exists in calcom cal.diy versions up to 4.9.4, where an unknown function can be exploited via cross-site request forgery. This allows attackers to initiate unauthorized actions on behalf of users without their consent, exposing sensitive data and potentially compromising user accounts. The exploit method is accessible to the public, raising serious security concerns for affected users. Despite early notifications to the vendor regarding this issue, no response has been recorded, highlighting a need for immediate user awareness and action.

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-2026-9303 - Proof of Concept

References

https://vuldb.com/vuln/365250
vdb-entry
https://vuldb.com/vuln/365250/cti
signaturepermissions-required
https://vuldb.com/submit/812173
third-party-advisory

CVSS V4

Score:
5.3
Severity:
MEDIUM
Confidentiality:
None
Integrity:
Low
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
Unknown

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

Eric-z (VulDB User)
VulDB CNA Team
.