critical9.1
CVE-2025-6427
An attacker was able to bypass the `connect-src` directive of a Content Security Policy by manipulating subdocuments.
Impact
An attacker was able to bypass the `connect-src` directive of a Content Security Policy by manipulating subdocuments. This would have also hidden the connections from the Network tab in Devtools. This vulnerability was fixed in Firefox 140 and Thunderbird 140.
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Mozilla | Firefox | before 140.0 |