CVE-2026-106471 in Candlepin
Summary
by MITRE • 10/07/2026
A flaw was found in Candlepin. The central authorization filter incorrectly grants access when any one of multiple @Verify-annotated parameters is accessible, instead of requiring access to every verified entity. A low-privilege authenticated attacker who can access the first referenced object can bypass authorization checks on subsequent objects. When target resource identifiers are known, this can enable unauthorized disclosure of consumer information and unauthorized modification of entitlements and related subscription resources, including across organizations.
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Analysis
by VulDB Data Team • 10/07/2026
The vulnerability identified in Candlepin represents a critical failure in the implementation of role-based access control mechanisms within the application's central authorization filter. This flaw stems from an incorrect logical evaluation of security constraints defined by @Verify annotations on method parameters. In secure software design, when multiple entities are referenced in a single operation requiring authentication and authorization checks, the system must verify that the requesting user possesses valid permissions for every individual entity involved. However, due to this implementation error, the filter employs a disjunctive logic rather than a conjunctive one. This means that if an authenticated attacker has access rights to just one of the referenced objects, the entire request is granted authorization, regardless of whether the user has any permission regarding the other entities in the same transaction.
This architectural weakness allows for significant privilege escalation and data exfiltration scenarios. A low-privilege authenticated user who can legitimately view or interact with a single consumer entity within their own scope can exploit this logic to access resources outside their authorized boundaries. By manipulating request parameters to include identifiers of target resources alongside the one they are permitted to access, the attacker effectively bypasses the authorization checks for those subsequent objects. This behavior directly contradicts the principle of least privilege and fails to enforce proper isolation between different organizational units or consumer groups managed by Candlepin.
The operational impact of this vulnerability is severe, particularly in multi-tenant environments where distinct organizations rely on strict data separation. An attacker can leverage this flaw to perform unauthorized disclosure of sensitive consumer information belonging to other users or organizations. Furthermore, the ability to bypass authorization checks extends beyond read operations; it enables unauthorized modification of entitlements and related subscription resources. This could lead to the illegal assignment of software subscriptions, alteration of usage metrics, or disruption of service availability for legitimate customers. The scope of this impact is not limited to a single organization but can span across multiple organizations if their identifiers are known, compromising the integrity of the entire subscription management infrastructure.
From a classification perspective, this vulnerability aligns with CWE-285 Improper Authorization, specifically illustrating a failure in object-level access control where permissions for one resource incorrectly imply permission for others within the same context. It also maps to MITRE ATT&CK technique T1078 Valid Accounts, as it relies on existing authenticated credentials but abuses them to gain unauthorized access to additional resources. The specific mechanism of bypassing checks through logical flaws in parameter validation is characteristic of authorization logic errors that are often difficult to detect without rigorous security testing and code review focused on permission enforcement boundaries.
To mitigate this vulnerability, developers must refactor the central authorization filter to enforce conjunctive verification for all @Verify-annotated parameters. Every entity referenced in a request must be individually validated against the user's permissions before any action is taken. Implementing strict input validation that ensures each resource identifier corresponds to an object accessible by the current principal is essential. Additionally, adopting defense-in-depth strategies such as implementing comprehensive audit logging for authorization decisions can help detect attempts to exploit this logic flaw. Regular security assessments and penetration testing focused on horizontal privilege escalation should be conducted to ensure that access control policies are correctly applied across all organizational boundaries within the Candlepin ecosystem.