8.8
High
CVE-2026-84128 Privilege escalation in the WebDriver BiDi component
Description
Privilege escalation in the WebDriver BiDi component. This vulnerability was fixed in Firefox 155 and Thunderbird 155.
Affected products and versions
| Product | Affected versions | Fixed in |
|---|---|---|
| Firefox 155 | earliest → < 155 | 155 |
| Thunderbird 155 | earliest → < 155 | 155 |
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