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Vulnerability record · CVE-2019-9816 · published 23 July 2019

CVE-2019-9816: Mozilla firefox type confusion vulnerability

Mozilla · Firefox

A possible vulnerability exists where type confusion can occur when manipulating JavaScript objects in object groups, allowing for the bypassing of security checks within these groups. *Note: this vulnerability has only been demonstrated with UnboxedObjects, which are disabled by default on all supported releases.*. This vulnerability affects Thunderbird < 60.7, Firefox < 67, and Firefox ESR < 60.7.

5.9 CVSS 3.0 Medium EPSS 6.2% · top 6.8% CWE-843 · Type confusion
5.9CVSS 3.0 base score, v2 4.3
6.2%EPSS exploitation probability, 30 days
NoNot in CISA KEV
3Affected product versions listed by NVD
8References
17 Jun 2026Last modified by NVD

Description

A possible vulnerability exists where type confusion can occur when manipulating JavaScript objects in object groups, allowing for the bypassing of security checks within these groups. *Note: this vulnerability has only been demonstrated with UnboxedObjects, which are disabled by default on all supported releases.*. This vulnerability affects Thunderbird < 60.7, Firefox < 67, and Firefox ESR < 60.7.

CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N

Affected products

3 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://bugzilla.mozilla.org/show_bug.cgi?id=1536768 Permissions Required
https://www.mozilla.org/security/advisories/mfsa2019-13/ Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2019-14/ Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2019-15/ Vendor Advisory
https://bugzilla.mozilla.org/show_bug.cgi?id=1536768 Permissions Required
https://www.mozilla.org/security/advisories/mfsa2019-13/ Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2019-14/ Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2019-15/ Vendor Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2019-9816), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.