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Casco Autonomous Security

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Improper JWT Verification Leading to Cross-User Data Exposure in AI Claims Chat.

CRITICALCVSS 9.8

The endpoint accepts a client-supplied JWT but does not verify its signature or validate the claim against the authenticated session. An attacker can tamper the field to impersonate another user, causing the backend to fetch and feed that user's private documents into the LLM, which then leaks sensitive data.

Business impact articulated

!Unauthorized disclosure of PII, health records, and underwriting notes.

!Violation of data-protection regulations (e.g., HIPAA).

!Significant reputational damage and potential legal liability.

Step-by-step reproduction

Obtain a valid JWT for User A.
Decode the JWT payload and change the sub claim to User B's ID.
Re-encode the token without resigning.
Send a POST to /claims/chat with the modified JWT in Authorization.
Observe that the response (LLM summary) includes User B's documents—confirming the backend never verified the signature or subject claim.

Enforce JWT signature validation on every request using the issuer's public key.
Ensure the sub claim matches the authenticated user context before data retrieval.
Implement per-user authorization checks on document fetch APIs, rejecting mismatched subjects.
Log and alert on any failed or tampered JWT validations.

One-click Retest

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In the Age of AI, security is more important than ever

That’s why Casco is a proud Gold Sponsor of OWASP (Open Worldwide Application Security Project), fostering accessible AI-driven security tooling.

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Always-on Security Testing

Fast-moving companies choose Casco over traditional pentesters

Year-round security instead of once-a-year security

No time wasted on false-positives

FAANG-approved pentests without needing to wait weeks

Once-a-year security to year-round security

Outperforms human penetration testers

Clear findings — what to fix, and why it matters

In the Age of AI, security is more important than ever