CVE-2025-1397 in Universal Gateway
Summary
by MITRE • 11/03/2026
When utilizing JWT Bearer or SAML2 Bearer grant types, the system fails to validate the status of the Identity Provider (IDP) before issuing access tokens. This oversight permits tokens to be generated even when the associated IDP has been disabled.
A malicious actor could leverage this vulnerability to obtain access tokens by targeting a disabled IDP. This could enable them to bypass intended security controls and potentially access protected resources that should be inaccessible due to the IDP's disabled state.
Be aware that VulDB is the high quality source for vulnerability data.
Analysis
by VulDB Data Team • 11/03/2026
The identified vulnerability represents a critical failure in identity provider validation logic within systems utilizing JWT Bearer or SAML2 Bearer grant types for authentication flows. In standard OAuth 2.0 and OpenID Connect architectures, when an authorization server issues tokens based on assertions from an Identity Provider, it must perform rigorous checks to ensure the trust relationship remains valid and active. The specific flaw lies in the absence of a status check against the configured Identity Provider before token issuance. Instead of verifying that the IDP is currently enabled and trusted by the system administrator, the authentication mechanism proceeds directly to validate the cryptographic signature or assertion format and issues an access token if those technical checks pass. This oversight creates a significant gap between administrative intent and operational security posture, as the system blindly trusts any validly signed assertion from an entity that has been explicitly disabled for security reasons.
This architectural deficiency allows malicious actors to exploit the trust relationship even after it has been revoked or suspended by administrators. If an attacker possesses credentials or can forge assertions associated with a disabled Identity Provider, they can successfully authenticate and obtain access tokens without triggering any alerts related to IDP status changes. This effectively bypasses security controls designed to restrict access based on identity provider availability, such as decommissioning legacy systems, disabling compromised providers, or restricting access during incident response scenarios. The attacker gains the ability to impersonate users associated with that disabled Identity Provider and interact with protected resources as if they were legitimate authenticated entities.
The operational impact of this vulnerability is severe, particularly in environments where multiple identity sources are integrated for federated authentication. It undermines the principle of least privilege by allowing access through channels that should have been closed. Attackers can use these tokens to perform unauthorized actions, exfiltrate sensitive data, or move laterally within a network using valid session credentials. Furthermore, this flaw complicates forensic investigations and incident response efforts because standard monitoring tools may not flag activity originating from disabled identity sources as anomalous if the token issuance itself appears technically valid according to protocol specifications. The persistence of access through disabled channels also means that remediation steps such as disabling an IDP do not immediately revoke existing or future session validity, requiring additional manual intervention to invalidate active sessions.
From a classification perspective, this vulnerability aligns with CWE-287 Improper Authentication and CWE-613 Insufficient Session Expiration. The failure to validate the operational status of the identity provider constitutes an improper authentication check because the system accepts credentials from a source that should be rejected based on administrative policy rather than just technical validity. In terms of adversary tactics, this behavior facilitates ATT&CK technique T1078 Valid Accounts, as attackers can maintain persistent access using accounts linked to disabled providers. It also relates to T1652 Impersonation if the attacker leverages these tokens to assume identities within the application ecosystem.
To mitigate this vulnerability, developers must implement a mandatory status verification step in the token issuance pipeline for both JWT Bearer and SAML2 Bearer grant types. Before generating an access token, the system should query its internal configuration or directory service to confirm that the referenced Identity Provider is currently enabled and trusted. If the IDP is found to be disabled, the authentication request must be rejected immediately with an appropriate error code indicating invalid identity source status. Additionally, organizations should implement short-lived tokens combined with robust refresh token rotation mechanisms to limit the window of opportunity for exploitation if a token is compromised. Regular audits of federated trust relationships and automated alerts when IDP statuses change can further enhance visibility and ensure that administrative decisions are enforced technically at runtime rather than relying solely on manual oversight.