CVE-2025-0663: WSO2 Identity Server

Medium severity, CVSS 6.8. EPSS: 0.2% chance of exploitation in the next 30 days.

A cross-tenant authentication vulnerability exists in multiple WSO2 products due to improper cryptographic design in Adaptive Authentication. A single cryptographic key is used across all tenants to sign authentication cookies, allowing a privileged user in one tenant to forge authentication cookies for users in other tenants. Because the Auto-Login feature is enabled by default, this flaw may allow an attacker to gain unauthorized access and potentially take over accounts in other tenants. Successful exploitation requires access to Adaptive Authentication functionality, which is typically restricted to high-privileged users. The vulnerability is only exploitable when Auto-Login is enabled, reducing its practical impact in deployments where the feature is disabled.

Affected products

• WSO2 Identity Server: version 5.10.0 only; version 5.11.0 only; version 6.0.0 only; version 6.1.0 only; version 7.0.0 only
• WSO2 Identity Server As Key Manager: version 5.10.0 only
• WSO2 Open Banking Iam: version 2.0.0 only

Published 2025-09-23. Last modified 2026-06-17.