5.4
Medium
CVE-2026-74963 Same-origin policy bypass in the Networking: Cookies component
Description
Same-origin policy bypass in the Networking: Cookies 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 |
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