CVE-2026-74952
High
Description
Privilege escalation in the Application Update component. This vulnerability was fixed in Firefox 154, Thunderbird 154, Firefox ESR 153.2, and Thunderbird 153.2.
SeverityHigh
CVSS8.8
Exploit probability—
Product
Mozilla Firefox
PublishedAug 18, 2026
First seenAug 18, 2026
Weakness typeCWE-269Improper privilege management
How to fix
Update
- mozilla firefox154.0.0 or later
- mozilla thunderbird154.0 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| mozilla firefox | v < 154.0.0 | 154.0.0 |
| mozilla thunderbird | v < 154.0 | 154.0 |
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