CVE-2026-82283 in VoltAgent
Summary
by MITRE • 08/28/2026
VoltAgent through 2.1.20 fails to validate conversation ownership in memory API handlers, allowing authenticated users to access other users' conversations. Attackers can read, modify, and delete arbitrary conversations and messages by supplying caller-controlled identifiers to memory endpoints.
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Analysis
by VulDB Data Team • 08/28/2026
The vulnerability identified in VoltAgent versions through 2.1.20 represents a critical failure in server-side logic regarding resource ownership validation within its memory API handlers. This flaw stems from an insecure direct object reference mechanism where the application fails to verify that the authenticated user initiating the request is the legitimate owner of the requested data resources. In secure architectural designs, APIs handling sensitive stateful information such as conversation history must enforce strict access control checks against a unique identifier associated with each session or record. However, in this implementation, the system relies on caller-controlled identifiers passed via API parameters without cross-referencing them against the identity context of the authenticated user. This oversight allows any validly authenticated actor to manipulate data belonging to other users by simply substituting their own resource identifiers with those belonging to victims.
From a technical perspective, this deficiency aligns directly with CWE-639, which describes Authorization Bypass Through User-Controlled Key. The attacker exploits the lack of server-side validation by crafting HTTP requests that target specific conversation IDs or message UUIDs associated with other tenants or users within the system. Because the application does not bind these identifiers to the session token or user profile used for authentication, it treats any provided identifier as valid if it exists in the database. This enables a range of malicious actions including reading private communications, modifying existing messages to alter context or inject misinformation, and deleting critical conversation history. The impact is severe because it compromises both confidentiality and integrity of data across multiple users within the same instance, effectively breaking multi-tenancy isolation principles that are fundamental to SaaS platforms.
The operational impact extends beyond simple data leakage. By allowing arbitrary modification and deletion of conversations, an attacker can disrupt business continuity for other users who rely on these records for context retention in AI-driven interactions. Furthermore, this vulnerability facilitates broader attack chains such as prompt injection or social engineering attacks if the stolen conversation history contains sensitive corporate information or personal details. The ability to delete messages also poses a significant risk to audit trails and compliance requirements that mandate data preservation. This behavior is consistent with patterns observed in ATT&CK technique T1530, Data from Information Repositories, where adversaries access stored data to gather intelligence for further exploitation phases.
Mitigation strategies must prioritize the implementation of robust object-level authorization checks at every API endpoint handling user-specific resources. Developers should ensure that all requests involving resource manipulation include a verification step that compares the requested resource identifier against an ownership attribute linked to the authenticated user's session or account ID. Additionally, implementing UUIDs with high entropy and avoiding sequential identifiers can reduce the ease of enumeration attacks often paired with such vulnerabilities. Input validation alone is insufficient; strict access control lists must be enforced server-side regardless of client-supplied data. Regular security audits focusing on API logic flaws and automated testing using dynamic application security scanning tools that specialize in identifying broken object level authorization issues are recommended to prevent recurrence.