The add-on installation feature in Mozilla Firefox before 40.0.3 and Firefox ESR 38.x before 38.2.1 allows remote attackers to bypass an intended user-confirmation requirement by constructing a crafted data: URL and triggering navigation to an arbitrary http: or https: URL at a certain early point in the installation process.
| Software | From | Fixed in |
|---|---|---|
| mozilla / firefox | - | 40.0.2.x |
| mozilla / firefox | 38.0 | 38.0.x |
| mozilla / firefox | 38.0.1 | 38.0.1.x |
| mozilla / firefox | 38.0.5 | 38.0.5.x |
| mozilla / firefox | 38.1.0 | 38.1.0.x |
| mozilla / firefox | 38.2.0 | 38.2.0.x |