Security experts have discovered a critical flaw in Amazon Quick, a business intelligence service by AWS, exposing its AI chat agents to users without proper authorization. Fog Security researchers identified the vulnerability, which allowed unauthorized interactions with enterprise AI tools, bypassing administrative restrictions.
Unveiling the Authorization Flaw
The issue arose from a missing server-side authorization mechanism, categorized under CWE-862. Unlike typical AWS resources, Amazon Quick requires custom permission profiles rather than standard AWS IAM policies to manage access. While the user interface respected these permissions, the backend API failed to enforce them.
Fog Security’s investigation revealed that by sending direct HTTP API requests, restricted users could communicate with the AI chat agents, accessing corporate data without proper clearance. This gap in security highlighted a significant oversight in enterprise control over shadow AI usage.
AWS’s Silent Patch Deployment
Upon identifying the flaw, Fog Security reported it to AWS through HackerOne on March 4, 2026. AWS responded swiftly, implementing a fix across select regions by March 11 and resolving the issue globally by March 12. However, AWS did not inform its customers or issue a public advisory, classifying the risk as negligible.
This lack of communication has raised concerns among security professionals, who fear that organizations remain unaware of their exposure to unauthorized internal AI access. The swift patching did prevent cross-tenant data breaches, but intra-account security was compromised.
Implications for Enterprise Security
The vulnerability underscores the necessity for robust access control mechanisms in cloud services, especially those integrating with sensitive corporate data. Organizations relied on custom permissions to restrict AI analytics, yet the backend oversight left them vulnerable. The incident emphasizes the importance of transparency in security communications to ensure clients are aware of their risks.
As AWS continues to strengthen its security posture, enterprises must remain vigilant and ensure comprehensive access controls are in place. This event serves as a reminder of the critical nature of stringent security protocols in safeguarding sensitive data against unauthorized access.
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