In Jenkins 2.567 and earlier, and Jenkins LTS 2.555.2 and earlier, configuration data submitted through POST config.xml is written to disk as-is after successful deserialization, and subsequent GET config.xml responses are served directly from the stored file. As a result, secrets included in submitted XML are not encrypted before being persisted in job configuration files on the Jenkins controller. Plaintext secrets therefore remain stored in config.xml and can later be disclosed through config.xml retrieval or direct filesystem access. The issue is tracked as SECURITY-3744.
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