CVE-2026-63768

MEDIUM 4.3

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

CVSS Score

4.3

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-601
Vendor	calcom
Product	cal.diy
Published	Jul 20, 2026
Last Updated	Jul 20, 2026

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CVSS v3 Breakdown

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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

Required

Scope

Unchanged

Confidentiality

None

Integrity

Low

Availability

None

Affected Versions

calcom / cal.diy

0 ≤ 6.2.0

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/calcom/cal.diy/issues/29679 github.com: https://github.com/calcom/cal.diy/pull/29681 vulncheck.com: https://www.vulncheck.com/advisories/cal-diy-conferencing-oauth-callback-open-redirect-via-unsigned-state

Credits

George Chen