CVE-2026-17048 in Keycloak
Summary
by MITRE • 07/24/2026
A flaw was found in the Keycloak Admin REST API, which is used to manage security realms and clients. The issue occurs when the system processes requests for rotated client secrets that are stored in a secure vault. Due to improper boundary enforcement, a delegated administrator with view-only permissions can retrieve the actual resolved secret instead of the vault placeholder, leading to the exposure of sensitive credentials.
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Analysis
by VulDB Data Team • 07/24/2026
This vulnerability resides within the Keycloak identity and access management platform where the administrative REST API fails to properly enforce access boundaries when handling rotated client secrets stored in external vault systems. The flaw represents a critical authorization bypass that allows malicious or compromised delegated administrators to escalate their privileges through credential exposure. When client secrets undergo rotation, they are typically replaced with placeholders within the Keycloak database while the actual secret values are maintained in secure external vaults such as HashiCorp Vault or AWS Secrets Manager. The improper boundary enforcement occurs during API request processing where the system should validate that only authorized users with appropriate administrative privileges can access the resolved secret values. However, the current implementation fails to properly authenticate and authorize these requests, allowing view-only administrators to bypass normal access controls and retrieve actual secret values instead of the vault placeholders they should be restricted from seeing.
The technical exploitation of this vulnerability leverages the gap between the API's permission model and its actual implementation of boundary enforcement mechanisms. When a delegated administrator makes requests for rotated secrets through the admin REST API, the system should validate their permissions against both the requested resource and the underlying vault access requirements. The flaw manifests when the system processes these requests without proper validation of whether the requesting user has elevated privileges necessary to access resolved secret values, effectively creating a path for privilege escalation. This represents a classic case of insufficient authorization checks that violates core security principles outlined in the OWASP Top Ten 2021 and aligns with CWE-863 - Incorrect Authorization. The vulnerability specifically impacts the principle of least privilege as defined in NIST SP 800-53, where users should only have access to resources necessary for their specific roles.
The operational impact of this vulnerability extends beyond simple credential exposure to encompass potential compromise of entire authentication ecosystems. When view-only administrators can retrieve actual client secrets, they gain the ability to impersonate legitimate clients, access protected resources, and potentially move laterally within the system. This exposure creates cascading security risks where a single compromised or misconfigured delegated administrator can lead to widespread credential compromise across multiple applications and services that rely on Keycloak for authentication. The vulnerability also impacts compliance requirements such as PCI DSS, HIPAA, and SOX standards that mandate strict control over access to sensitive credentials and privileged information. Organizations using Keycloak with integrated vault systems face significant risk of regulatory violations and potential data breaches when this vulnerability remains unpatched.
Mitigation strategies should focus on implementing proper authorization validation at the API boundary level and strengthening the permission model for delegated administrators. Organizations must ensure that all requests for resolved secret values are properly authenticated against both the user's role within Keycloak and their access rights to the underlying vault systems. This includes implementing additional layers of validation such as multi-factor authentication for credential access, logging all secret resolution attempts, and establishing automated monitoring for unauthorized access patterns. The implementation should follow ATT&CK technique T1566 - Phishing for Information to prevent social engineering attacks that might exploit this vulnerability by ensuring proper separation of privileges between view-only and administrative roles. System administrators should also implement regular security audits of delegated administrator permissions, establish strict change management processes for secret rotation, and ensure that all Keycloak instances are updated with the latest security patches addressing this specific boundary enforcement flaw.