9.8
Critical
CVE-2026-4717 Privilege escalation in the Netmonitor component
Description
Privilege escalation in the Netmonitor component. This vulnerability was fixed in Firefox 149, Firefox ESR 140.9, Thunderbird 149, and Thunderbird 140.9.
Affected products and versions
| Product | Affected versions | Fixed in |
|---|---|---|
| Firefox 149 | earliest → < 149 | 149 |
| Firefox 140.9 | earliest → < 140.9 | 140.9 |
| Thunderbird 149 | earliest → < 149 | 149 |
| Thunderbird 140.9 | earliest → < 140.9 | 140.9 |
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