Firefox normally asks for confirmation before asking the operating system to find an application to handle a scheme that the browser does not support. It did not ask before doing so for the Usenet-related schemes news: and snews:. Since most operating systems dont have a trusted newsreader installed by default, an unscrupulous program that the user downloaded could register itself as a handler. The website that served the application download could then launch that application at will. This vulnerability affects Firefox < 130, Firefox ESR < 128.2, and Firefox ESR < 115.15.
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Firefox | Mozilla | * | 130.0 (excluding) |
| Firefox_esr | Mozilla | * | 115.15 (excluding) |
| Firefox_esr | Mozilla | 128.0 (including) | 128.2 (excluding) |
| Red Hat Enterprise Linux 7 Extended Lifecycle Support | RedHat | firefox-0:128.2.0-1.el7_9 | * |
| Red Hat Enterprise Linux 8 | RedHat | firefox-0:128.2.0-1.el8_10 | * |
| Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support | RedHat | firefox-0:128.2.0-1.el8_4 | * |
| Red Hat Enterprise Linux 8.4 Telecommunications Update Service | RedHat | firefox-0:128.2.0-1.el8_4 | * |
| Red Hat Enterprise Linux 8.4 Update Services for SAP Solutions | RedHat | firefox-0:128.2.0-1.el8_4 | * |
| Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support | RedHat | firefox-0:128.2.0-1.el8_6 | * |
| Red Hat Enterprise Linux 8.6 Telecommunications Update Service | RedHat | firefox-0:128.2.0-1.el8_6 | * |
| Red Hat Enterprise Linux 8.6 Update Services for SAP Solutions | RedHat | firefox-0:128.2.0-1.el8_6 | * |
| Red Hat Enterprise Linux 9 | RedHat | firefox-0:128.2.0-1.el9_4 | * |
| Firefox | Ubuntu | focal | * |
| Mozjs102 | Ubuntu | esm-apps/noble | * |
| Mozjs102 | Ubuntu | jammy | * |
| Mozjs102 | Ubuntu | noble | * |
| Mozjs115 | Ubuntu | devel | * |
| Mozjs115 | Ubuntu | noble | * |
| Mozjs115 | Ubuntu | oracular | * |
| Mozjs52 | Ubuntu | esm-infra/bionic | * |
| Mozjs52 | Ubuntu | focal | * |
| Mozjs68 | Ubuntu | focal | * |
| Mozjs78 | Ubuntu | jammy | * |
| Mozjs91 | Ubuntu | jammy | * |