CVE-2019-9816

Mozilla: Type confusion with object groups and UnboxedObjects

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Severity

Important

Red Hat Product Security

5.9

CVSS 3.0

Review impact separately from score.

Published · May 22, 2019

Updated · November 22, 2025

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 score applicability

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

Mitigation

No mitigation is specified in collected source.

CVSS / CWE

CVSS 3.0 · 5.9
CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N

CWE-843 · Access of Resource Using Incompatible Type ('Type Confusion')