CVE-2026-63768
cal.diy 6.2.0 Conferencing OAuth Callback Open Redirect via Unsigned State
- State
- Published
- Severity
- 5.3 Medium
- Published
- Jul 20, 2026
- Updated
- Sep 17, 2026
- Reserved
- Jul 18, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 5.3 Medium | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N | VulnCheck |
| 3.1 | 4.3 Medium | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N | VulnCheck |
Weaknesses
- CWE-601 URL Redirection to Untrusted Site ('Open Redirect')
Affected Products
| Product | Versions |
|---|---|
cal.diycalcom |
|
References
- Researcher Disclosuretechnical-descriptionexploitissue-tracking
- Pull Requestissue-trackingpatch
- https://www.vulncheck.com/advisories/cal-diy-conferencing-oauth-callback-open-redirect-via-unsigned-statethird-party-advisory
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