CVE-2026-33388 in Guardian
Summary
by MITRE • 09/08/2026
An access control vulnerability was discovered in the Credentials Manager functionality due to insufficient validation of user privileges. A remote authenticated user with limited privileges can view a limited subset of the available entries in the Credentials Manager. The actual credential values are not directly visible, but the user can delete entries or edit their properties. An attacker who deletes or edits an entry can disrupt authentication for dependent devices, and one who manipulates an entry's configuration may be able to indirectly obtain the credentials.
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Analysis
by VulDB Data Team • 09/08/2026
The identified vulnerability resides within the Credentials Manager functionality of the affected system, representing a classic case of broken access control where privilege validation mechanisms are insufficiently rigorous. This flaw allows remote authenticated users operating with limited or standard privileges to interact with credential entries in ways that exceed their intended authorization levels. While the architecture correctly prevents these lower-privileged users from viewing the actual plaintext values of stored credentials, it fails to restrict other critical operations associated with those entries. Specifically, the system permits unauthorized deletion and modification of entry properties by any authenticated user regardless of role-based restrictions. This discrepancy between read-only access expectations for sensitive data and write-access permissions for metadata creates a significant security gap that undermines the integrity of the authentication infrastructure.
From an operational perspective, this vulnerability poses severe risks to service availability and credential confidentiality through indirect means. An attacker leveraging this flaw can delete critical credential entries, which effectively disrupts authentication processes for dependent devices or services relying on those specific credentials. This constitutes a denial-of-service condition against internal systems that require valid stored credentials for connectivity or authorization. Furthermore, the ability to edit entry properties opens avenues for configuration manipulation attacks. By altering metadata such as hostnames, ports, or protocol settings associated with a credential entry, an attacker can potentially redirect authentication attempts or trigger error states in dependent applications. These manipulated configurations may lead to information leakage scenarios where sensitive data is exposed through application logs, debug outputs, or unexpected network behaviors triggered by the misconfigured entries.
This vulnerability aligns closely with CWE-269 Improper Privilege Management and CWE-732 Incorrect Permission Assignment for Critical Resource within the Common Weakness Enumeration framework. The failure to enforce strict separation of duties between viewing sensitive data and managing resource configurations is a fundamental design flaw in access control logic. In terms of adversary tactics, this behavior maps directly to MITRE ATT&CK technique T1556.004 Credential Manager Modification, which describes attackers modifying stored credentials or their associated properties to maintain persistence, disrupt operations, or facilitate lateral movement. The ability to delete entries also relates to T1537 Delete Cloud Credentials, although applied in an on-premises context here, demonstrating how credential management systems are high-value targets for disruption and manipulation rather than just direct theft of secrets.
Mitigation strategies must focus on implementing robust role-based access control (RBAC) policies that strictly limit write operations to the Credentials Manager interface. Administrators should ensure that only users with explicit administrative privileges can delete or modify credential entries, while standard users are restricted to read-only views if necessary for troubleshooting purposes without exposure of actual secrets. Additionally, input validation and authorization checks must be enforced at both the application logic layer and the API level to prevent privilege escalation via parameter manipulation. Implementing an audit logging mechanism that records all modification attempts, successful or failed, is essential for detecting exploitation activities early. Regular security assessments should include penetration testing focused on access control bypasses in credential management modules to identify similar weaknesses before they can be exploited by malicious actors seeking to disrupt organizational authentication services.