| Package | Affected versions | Patched versions |
|---|---|---|
| firefox | < 63.0 | 63.0 |
| firefox esr | < 60.3 | 60.3 |
By rewriting the Host: request headers using the webRequest API, a WebExtension can bypass domain restrictions through domain fronting. This would allow access to domains that share a host that are otherwise restricted. This vulnerability affects Firefox ESR < 60.3 and Firefox < 63.
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