Improper Cryptographic Signature Verification in SAP Cloud SDK for Python

CVE-2026-109799

What is CVE-2026-109799?

The SAP Cloud SDK for Python exposes a vulnerability in the IASContextProvider, where improper cryptographic signature verification occurs. This issue arises from the extraction of claims from a JSON Web Token (JWT) in the Authorization header without validation of the token's signature. A threat actor can exploit this by submitting a self-signed JWT, which impersonates a victim tenant/user. The result allows this forged identity to propagate through various downstream processes, potentially enabling unauthorized access or actions across systems. This vulnerability builds on a previous fix that addressed similar unverified patterns, emphasizing the importance of thorough validation mechanisms in security practices.

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