Jenkins through 2.196, LTS 2.176.3 and earlier prints the value of the cookie on the /whoAmI/ URL despite it being marked HttpOnly, thus making it possible to steal cookie-based authentication credentials if the URL is exposed or accessed via another cross-site scripting issue.
id: CVE-2019-10405
info:
name: Jenkins <=2.196 - Cookie Exposure
author: c-sh0
severity: medi
...