8.1
High
CVE-2026-74983 Mitigation bypass in the Data Loss Prevention component
Description
Mitigation bypass in the Data Loss Prevention component. This vulnerability was fixed in Firefox 154, Firefox ESR 140.14, Firefox ESR 153.1, Thunderbird 154, Thunderbird 140.14, and Thunderbird 153.1.
Affected products and versions
| Product | Affected versions | Fixed in |
|---|---|---|
| Firefox 154 | earliest → < 154 | 154 |
| Firefox 153.1 | earliest → < 153.1 | 153.1 |
| Firefox 140.14 | earliest → < 140.14 | 140.14 |
| Thunderbird 154 | earliest → < 154 | 154 |
| Thunderbird 153.1 | earliest → < 153.1 | 153.1 |
| Thunderbird 140.14 | earliest → < 140.14 | 140.14 |