The vulnerability centers on insecure XML parsing in job history processing. The primary vulnerable function is JobConf.loadResource which handles XML configuration loading. This function would appear in stack traces when processing malicious job configs. The parseHistoryTimelineEvent is involved in processing historical job data and would handle attacker-supplied XML payloads. Both functions would show XML parsing activity without security features (like disallowing DTDs) in vulnerable versions. The high confidence for JobConf.loadResource aligns with typical XXE vulnerability patterns in configuration parsing, while the history server component gets medium confidence based on attack vector description.