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| Package Name | Ecosystem | Vulnerable Versions | First Patched Version |
|---|---|---|---|
| sap-xssec | pip | < 4.1.0 | 4.1.0 |
The vulnerability stemmed from improper handling of the JWT audience ('aud') claim. The commit diff shows a critical fix in security_context_ias.py where a string 'aud' value is explicitly converted to a list before validation. Prior to 4.1.0, if a token contained a string-formatted 'aud' claim (permitted by JWT RFC), the validation would fail to properly compare it against allowed audiences, enabling privilege escalation. The vulnerable function was directly responsible for audience validation, and the patch explicitly addresses this handling, making it the clear root cause.
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