In Firefox before 68.0, Activity Stream can display content from sent from the Snippet Service website. This content is written to innerHTML on the Activity Stream page without sanitization, allowing for a potential access to other information available to the Activity Stream, such as browsing history, if the Snipper Service were compromised.
In Firefox before 68.0, Activity Stream can display content from sent from the Snippet Service website. This content is written to innerHTML on the Activity Stream page without sanitization, allowing for a potential access to other information available to the Activity Stream, such as browsing history, if the Snipper Service were compromised.
https://www.mozilla.org/en-US/security/advisories/mfsa2019-21/#CVE-2019-11718 https://bugzilla.mozilla.org/show_bug.cgi?id=1408349
Vulmon