Jinjava before 2.5.4 allow access to arbitrary classes by calling Java methods on objects passed into a Jinjava context. This could allow for abuse of the application class loader, including Arbitrary File Disclosure.
github.com/HubSpot/jinjava/compare/jinjava-2.5.3...jinjava-2.5.4
github.com/HubSpot/jinjava/pull/426/commits/5dfa5b87318744a4d020b66d5f7747acc36b213b
github.com/HubSpot/jinjava/pull/435/commits/1b9aaa4b420c58b4a301cf4b7d26207f1c8d1165
github.com/HubSpot/jinjava/releases/tag/jinjava-2.5.4
nvd.nist.gov/vuln/detail/CVE-2020-12668
securitylab.github.com/advisories/GHSL-2020-072-hubspot_jinjava