6.1
Medium
CVE-2025-6430 When a file download is specified via the `Content-Disposition` header, that directive would be ignored if the file…
Description
When a file download is specified via the `Content-Disposition` header, that directive would be ignored if the file was included via a `<embed>` or `<object>` tag, potentially making a website vulnerable to a cross-site scripting attack. This vulnerability was fixed in Firefox 140, Firefox ESR 128.12, Thunderbird 140, and Thunderbird 128.12.
Affected products and versions
| Product | Affected versions | Fixed in |
|---|---|---|
| Firefox 140 | earliest → < 140 | 140 |
| Firefox 128.12 | earliest → < 128.12 | 128.12 |
| Firefox ESR 128.12 | earliest → < 128.12 | 128.12 |
| Thunderbird 140 | earliest → < 140 | 140 |
| Thunderbird 128.12 | earliest → < 128.12 | 128.12 |