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...because earlier versions reference xmpcore 5.1.2 which is affected by http://www.cvedetails.com/cve/CVE-2016-4216/
OAK-6881 indirect test dependencies through tika-parser to vulnerable version of xmpcore
JCR-4215 Use Tika version 1.17
TIKA-2034 Upgrade XMPCore to 5.1.3