Beaker before 0.8.9 allows a sandbox escape, enabling system access and code execution. This occurs because Electron context isolation is not used, and therefore an attacker can conduct a prototype-pollution attack against the Electron internal messaging API.

python-beaker: Deserialization of Untrusted Data which can lead to Arbitrary code execution

The Beaker library through 1.11.0 for Python is affected by deserialization of untrusted data, which could lead to arbitrary code execution.