CVE-2026-105139 in Obot
Summary
by MITRE • 10/07/2026
Obot 0.26.0 before 0.26.2 contains an authorization bypass vulnerability that allows authenticated users matching any vMCP profile to reach prompts and resources of ungranted components. Because profiles were enforced only on tools, attackers can access prompts, resources, and resource templates through the vMCP owner's shared component connection.
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Analysis
by VulDB Data Team • 10/07/2026
The identified security flaw in Obot versions prior to 0.26.2 represents a critical authorization bypass vulnerability that undermines the integrity of role-based access controls within the application environment. This issue specifically affects authenticated users who are assigned any virtual Machine Control Panel profile, allowing them to circumvent intended restrictions and gain unauthorized access to prompts, resources, and resource templates belonging to components they do not have explicit permission to use. The root cause lies in an inconsistent enforcement mechanism where security policies were applied exclusively at the tool level rather than across all interaction points within the system architecture. This architectural oversight creates a significant gap between the intended security model and its actual implementation, permitting lateral movement or privilege escalation through alternative entry vectors that bypass the primary access controls.
From a technical perspective, the vulnerability exploits the fact that while tools were properly gated by vMCP profiles, other critical components such as prompts and resource templates remained accessible via shared component connections associated with the vMCP owner. An attacker leveraging this flaw can interact directly with these unprotected endpoints to retrieve sensitive data or execute operations on behalf of higher-privileged users. This behavior aligns closely with CWE Category 285 Improper Authorization, specifically reflecting scenarios where access control checks are not uniformly applied across all application functions and resources. The ability to reach ungranted components through shared connections indicates a failure in the principle of least privilege, as the system fails to verify whether the current session has explicit rights for each specific resource type before granting access.
The operational impact of this vulnerability is substantial, particularly in multi-tenant or enterprise environments where strict isolation between user roles and component ownership is required. By accessing prompts and resources intended for other users or administrative functions, an attacker can potentially exfiltrate confidential information, manipulate system configurations, or disrupt service availability by altering resource templates. This lack of granular access control erodes trust in the authentication framework and exposes the organization to risks associated with data leakage and unauthorized state changes. Furthermore, because the bypass relies on shared component connections, it may remain undetected for extended periods if monitoring tools focus solely on tool-level interactions rather than comprehensive endpoint auditing.
To mitigate this risk, immediate patching to version 0.26.2 or later is required as these updates address the inconsistent enforcement logic by extending authorization checks to all resource types including prompts and templates. In addition to updating software, organizations should implement defense-in-depth strategies such as rigorous input validation and strict output encoding for any exposed endpoints. Security teams are advised to review their access control matrices to ensure that permissions are enforced uniformly across all application components regardless of the entry point used by the user. Regular penetration testing focused on authorization bypass techniques can help identify similar gaps in other systems, ensuring that future developments adhere strictly to secure coding standards and comprehensive identity governance protocols aligned with industry best practices like MITRE ATT&CK technique T1078 Valid Accounts for lateral movement prevention.