An issue was discovered in ownCloud owncloud/oauth2 before 0.6.1, when Allow Subdomains is enabled. An attacker is able to pass in a crafted redirect-url that bypasses validation, and consequently allows an attacker to redirect callbacks to a Top Level Domain controlled by the attacker.

References

• https://nvd.nist.gov/vuln/detail/CVE-2023-49104
• https://owncloud.com/security-advisories/subdomain-validation-bypass/
• https://owncloud.org/security