The OAuth2 Hawk and JOSE MAC Validation code in Apache CXF prior to 3.0.13 and 3.1.x prior to 3.1.10 is not using a constant time MAC signature comparison algorithm which may be exploited by sophisticated timing attacks.
https://access.redhat.com/errata/RHSA-2017:1832
http://www.securityfocus.com/bid/96398
http://cxf.apache.org/security-advisories.data/CVE-2017-3156.txt.asc