CVE-2026-63768

cal.diy 6.2.0 Conferencing OAuth Callback Open Redirect via Unsigned State

cal.diy through 6.2.0 contains an open redirect vulnerability in the conferencing OAuth callback endpoint that allows attackers to redirect users to arbitrary URLs by crafting malicious state parameters. Attackers can exploit the unsigned state parameter and onErrorReturnTo field to silently redirect visitors from the trusted domain to attacker-controlled URLs for phishing attacks.

Affected

calcom · cal.diy

CVSS v4.0 VULNCHECK

5.3 MEDIUMCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

CVSS v3.1 VULNCHECK

4.3 MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N

EPSS

0.34% chance of exploitation in the next 30 days, 26th percentile

Published

2026-07-20

Updated

2026-09-17

Proof-of-concept exploits (1)

• calcom/cal.diy/issues/2967948976★ · 2026-09-26

References

• CVE Record
• NVD entry

Related

• CVE-2026-104054