When Private Browsing mode is used, it is possible for a web worker to write persistent data to IndexedDB and fingerprint a user uniquely. IndexedDB should not be available in Private Browsing mode and this stored data will persist across multiple private browsing mode sessions because it is not cleared when exiting. This vulnerability affects Firefox ESR < 52.5.2 and Firefox < 57.0.1.
http://www.securityfocus.com/bid/102039
http://www.securityfocus.com/bid/102112
http://www.securitytracker.com/id/1039954
https://access.redhat.com/errata/RHSA-2017:3382
https://bugzilla.mozilla.org/show_bug.cgi?id=1410106
https://lists.debian.org/debian-lts-announce/2017/12/msg00003.html
https://www.debian.org/security/2017/dsa-4062
Source: MITRE
Published: 2018-06-11
Updated: 2018-08-06
Type: CWE-200
Base Score: 5
Vector: AV:N/AC:L/Au:N/C:P/I:N/A:N
Impact Score: 2.9
Exploitability Score: 10
Severity: MEDIUM
Base Score: 7.5
Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Impact Score: 3.6
Exploitability Score: 3.9
Severity: HIGH