CVE-2026-63768 cal.diy 6.2.0 Conferencing OAuth Callback Open Redirect via Unsigned State
Attackers can redirect users to malicious URLs via OAuth callback parameters, enabling phishing attacks against Cal.com users.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-63768?
CVE-2026-63768 is a medium-severity vulnerability in calcom cal.diy, published on 20 Jul 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
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.
Weakness: CWE-601
Which versions are affected by CVE-2026-63768?
How do I fix CVE-2026-63768?
No fix has been published for CVE-2026-63768 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-63768 being exploited?
There is no known exploitation of CVE-2026-63768 in the wild and no public exploit code.
Sources
Also known as GHSA-5wvx-w47w-mg4x.