It was discovered that Werkzeug has insufficient debugger PIN randomness. An attacker could use this issue to access sensitive information. This issue only affected Ubuntu 18.04 LTS. (CVE-2019-14806)
It was discovered that Werkzeug incorrectly handled certain URLs. An attacker could possibly use this issue to cause pishing attacks. This issue only affected Ubuntu 16.04 LTS. (CVE-2020-28724)