PowerJob Server 5.1.2, and likely earlier versions, uses a predictable signing key for HS256 JSON Web Token authentication. An attacker who derives or knows the key can forge authentication tokens accepted by the server, potentially obtaining authorization sufficient to invoke functionality that enables arbitrary code execution.
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1 valid exploit after Mallory filtered fakes, detection scripts, and README-only repos.
This two-file repository contains a Python proof-of-concept and supporting README for an authentication-bypass vulnerability in PowerJob Server 5.1.2. PowerJob_jwt_key.py derives the HS256 signing key by concatenating the embedded BASE_SECURITY constant with MD5(JDBC URL), Base64-decoding the result, and signing a JWT locally with Python standard-library cryptographic functions. It computes the PWJB encryptedToken using the default password, forges a seven-day PWJB_ADMIN token, then uses requests to POST to /namespace/list with the PowerJwt header and report whether authentication succeeded. No shell, persistence, file modification, or remote-code-execution payload is present. The README describes the underlying predictable-key condition, default-deployment assumptions, web-console administrator impact, and a claimed related OpenAPI token-forgery path not directly exercised by the script.
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