| Package | Affected versions | Patched versions |
|---|---|---|
| firefox | < 97.0 | 97.0 |
| firefox esr | < 91.6 | 91.6 |
| thunderbird | < 91.6 | 91.6 |
A Time-of-Check Time-of-Use bug existed in the Maintenance (Updater) Service that could be abused to grant Users write access to an arbitrary directory. This could have been used to escalate to SYSTEM access.<br>*This bug only affects Firefox on Windows. Other operating systems are unaffected.*. This vulnerability affects Firefox < 97, Thunderbird < 91.6, and Firefox ESR < 91.6.
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