8.1
High
CVE-2026-0877 Mitigation bypass in the DOM: Security component
Description
Mitigation bypass in the DOM: Security component. This vulnerability was fixed in Firefox 147, Firefox ESR 115.32, Firefox ESR 140.7, Thunderbird 147, and Thunderbird 140.7.
Affected products and versions
| Product | Affected versions | Fixed in |
|---|---|---|
| Firefox 147 | earliest → < 147 | 147 |
| Firefox 140.7 | earliest → < 140.7 | 140.7 |
| Firefox 115.32 | earliest → < 115.32 | 115.32 |
| Firefox ESR 140.7 | earliest → < 140.7 | 140.7 |
| Thunderbird 147 | earliest → < 147 | 147 |
| Thunderbird 140.7 | earliest → < 140.7 | 140.7 |
| Red Hat Enterprise Linux Server (v. 7 ELS) | Versions not published | |
| Red Hat Enterprise Linux AppStream EUS (v. 10.0) | Versions not published | |
| Red Hat Enterprise Linux AppStream (v. 10) | Versions not published |