Details for this vulnerability have not been published by NIST at this point. Descriptions from software vendor advisories for this issue are provided below.
From VID-05463E0A-ABD3-4FA4-BD5F-CD5ED132D4C6:
Mozilla Foundation reports:
CVE-2019-11751: Malicious code execution through command line parameters
CVE-2019-11746: Use-after-free while manipulating video
CVE-2019-11744: XSS by breaking out of title and textarea elements using innerHTML
CVE-2019-11742: Same-origin policy violation with SVG filters and canvas to steal cross-origin images
CVE-2019-11736: File manipulation and privilege escalation in Mozilla Maintenance Service
CVE-2019-11753: Privilege escalation with Mozilla Maintenance Service in custom Firefox installation location
CVE-2019-11752: Use-after-free while extracting a key value in IndexedDB
CVE-2019-9812: Sandbox escape through Firefox Sync
CVE-2019-11741: Isolate addons.mozilla.org and accounts.firefox.com
CVE-2019-11743: Cross-origin access to unload event attributes
CVE-2019-11748: Persistence of WebRTC permissions in a third party context
CVE-2019-11749: Camera information available without prompting using getUserMedia
CVE-2019-5849: Out-of-bounds read in Skia
CVE-2019-11750: Type confusion in Spidermonkey
CVE-2019-11737: Content security policy directives ignore port and path if host is a wildcard
CVE-2019-11738: Content security policy bypass through hash-based sources in directives
CVE-2019-11747: 'Forget about this site' removes sites from pre-loaded HSTS list
CVE-2019-11734: Memory safety bugs fixed in Firefox 69
CVE-2019-11735: Memory safety bugs fixed in Firefox 69 and Firefox ESR 68.1
CVE-2019-11740: Memory safety bugs fixed in Firefox 69, Firefox ESR 68.1, and Firefox ESR 60.9
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