Disclosure summary
By checking the result of calls to `window.open` with specifically set protocol handlers, an attacker could determine if the application which implements that protocol handler is installed. This vulnerability affects Firefox < 131, Firefox ESR < 128.3, Thunderbird < 128.3, and Thunderbird < 131.
Source-reported weakness categories
NVD-CWE-noinfo, CWE-203
Source-specific records & product guidance
Sources retain their own attribution and scoring. Follow the original record to confirm affected versions, fixed releases, and configuration conditions.
NIST National Vulnerability Database · NVD-CVE-2024-9398
Open original source · Updated Oct 08, 2026
Only CPE matches marked vulnerable=true are indexed. AND/OR platform conditions must be checked in the original NVD record.
| Vendor | Product / association | Version / bounds |
|---|---|---|
| mozilla | firefox | * {"versionEndExcluding":"128.3.0"} |
| mozilla | firefox | * {"versionEndExcluding":"131.0"} |
| mozilla | thunderbird | * {"versionEndExcluding":"128.3"} |
| mozilla | thunderbird | 129.0 |
| mozilla | thunderbird | 129.0 |
| mozilla | thunderbird | 129.0 |
| mozilla | thunderbird | 129.0 |
| mozilla | thunderbird | 129.0 |
| mozilla | thunderbird | 129.0 |
Original records & references
- NIST NVD record
- CVE Program record
- bugzilla.mozilla.org — Issue Tracking, Permissions Required
- www.mozilla.org — Vendor Advisory
- www.mozilla.org — Vendor Advisory
- www.mozilla.org — Vendor Advisory
- www.mozilla.org — Vendor Advisory
PUBLISHED 2024-10-01T12:15:10-04:00
MODIFIED 2026-10-08T11:37:15-04:00
INGESTED 2026-10-08T12:30:36-04:00