Crafted CSS in an RSS feed can leak and reveal local path strings, which may contain user name.
Acknowledgments: Name: the Mozilla project Upstream: cure53
External References: https://www.mozilla.org/en-US/security/advisories/mfsa2017-30/#CVE-2017-7847
This issue has been addressed in the following products: Red Hat Enterprise Linux 7 Red Hat Enterprise Linux 6 Via RHSA-2018:0061 https://access.redhat.com/errata/RHSA-2018:0061