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CVE-2021-43542 Using XMLHttpRequest, an attacker could have identified installed applications by probing error messages for loading…
Description
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.
Affected products and versions
| Product | Affected versions | Fixed in |
|---|---|---|
| Thunderbird 91.4 | earliest → < 91.4.0 | 91.4.0 |
| Firefox ESR 91.4 | earliest → < 91.4.0 | 91.4.0 |
| Firefox 95 | earliest → < 95 | 95 |
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