Elastic X-Pack Security versions prior to 5.4.1 and 5.3.3 did not always correctly apply Document Level Security to index aliases. This bug could allow a user with restricted permissions to view data they should not have access to when performing certain operations against an index alias.
Exploitability
AV:NAC:LPR:LUI:NScope
S:UImpact
C:LI:NA:N4.3/CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:NOther