| Package | Affected versions | Patched versions |
|---|---|---|
| firefox | < 95.0 | 95.0 |
| firefox esr | < 91.4.0 | 91.4.0 |
| thunderbird | < 91.4.0 | 91.4.0 |
Using XMLHttpRequest, an attacker could have identified installed applications by probing error messages for loading external protocols. This vulnerability affects Thunderbird < 91.4.0, Firefox ESR < 91.4.0, and Firefox < 95.
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