An attacker could have sent a message to the parent process where the contents were used to double-index into a JavaScript object, leading to prototype pollution and ultimately attacker-controlled JavaScript executing in the privileged parent process. This vulnerability affects Firefox ESR < 91.9.1, Firefox < 100.0.2, Firefox for Android < 100.3.0, and Thunderbird < 91.9.1.
The product receives input from an upstream component that specifies attributes that are to be initialized or updated in an object, but it does not properly control modifications of attributes of the object prototype.
| Link | Tags |
|---|---|
| https://www.mozilla.org/security/advisories/mfsa2022-19/ | vendor advisory |
| https://bugzilla.mozilla.org/show_bug.cgi?id=1770048 | issue tracking permissions required vendor advisory |