CVE-2024-9398By 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.
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- 5.3 MEDIUM (v3.1, NVD)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
- Weakness (CWE)
- CWE-203
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Not given
- NVD analysis
- Analyzed
- Record last updated
- Oct 8, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
mozilla firefox mozilla:firefox | before 128.3.0; before 131.0 | NVD |
mozilla thunderbird mozilla:thunderbird | before 128.3; 129.0; 129.0; 129.0; 129.0; 129.0; 129.0 | NVD |
References
- https://bugzilla.mozilla.org/show_bug.cgi?id=1881037issue-tracking, permissions-required
- https://www.mozilla.org/security/advisories/mfsa2024-46/vendor-advisory
- https://www.mozilla.org/security/advisories/mfsa2024-47/vendor-advisory
- https://www.mozilla.org/security/advisories/mfsa2024-49/vendor-advisory
- https://www.mozilla.org/security/advisories/mfsa2024-50/vendor-advisory
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.