| Package | Affected versions | Patched versions |
|---|---|---|
| firefox | < 100.0.2< 100.3.0 | 100.0.2100.3.0 |
| firefox esr | < 91.9.1 | 91.9.1 |
| thunderbird | < 91.9.1 | 91.9.1 |
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.
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