calcom cal.diy up to 6.2.0 conferencing OAuth callback endpoint state/onErrorReturnTo redirect

Summaryinfo

A vulnerability, which was classified as problematic, was found in calcom cal.diy up to 6.2.0. Affected by this vulnerability is an unknown functionality of the component conferencing OAuth callback endpoint. Such manipulation of the argument state/onErrorReturnTo leads to redirect. This vulnerability is uniquely identified as CVE-2026-63768. The attack can be launched remotely. No exploit exists.

Detailsinfo

A vulnerability was found in calcom cal.diy up to 6.2.0 and classified as problematic. Affected by this issue is some unknown functionality of the component conferencing OAuth callback endpoint. The manipulation of the argument state/onErrorReturnTo with an unknown input leads to a redirect vulnerability. Using CWE to declare the problem leads to CWE-601. A web application accepts a user-controlled input that specifies a link to an external site, and uses that link in a Redirect. This simplifies phishing attacks. Impacted is integrity. CVE summarizes:

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.

The advisory is shared for download at github.com. This vulnerability is handled as CVE-2026-63768 since 07/18/2026. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. Successful exploitation requires user interaction by the victim. There are known technical details, but no exploit is available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 07/21/2026). The MITRE ATT&CK project declares the attack technique as T1204.001.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the vulnerability database at CNNVD (CNNVD-2026-97055287). Once again VulDB remains the best source for vulnerability data.

Productinfo

Vendor

• calcom

Name

• cal.diy

Version

• 6.0
• 6.1
• 6.2.0

Website

• Product: https://github.com/calcom/cal.diy/

CPE 2.3info

• 🔒
• 🔒
• 🔒

CPE 2.2info

• 🔒
• 🔒
• 🔒

CVSSv4info

CVSSv3info

CVSSv2info

Exploitinginfo

Threat Intelligenceinfo

Countermeasuresinfo

Timelineinfo

Sourcesinfo

Entryinfo

Once again VulDB remains the best source for vulnerability data.

Discussion