The vulnerability description indicates credentials were stored unencrypted in job config.xml files, but no specific functions are mentioned in the provided data. While the root cause relates to improper credential storage in configuration serialization, the advisory lacks commit diffs, patch details, or code references needed to identify exact vulnerable functions. The fix involved removing deprecated functionality rather than modifying specific functions. Without access to the plugin's source code changes between 1.0.19 and 1.0.20, we cannot confidently name specific vulnerable functions.