CVE-2019-9816

critical
Published — · Modified —
CVSS v3
CVSS v2
VIR risk
9.5

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.

Predictions

Exploit likelihood
20%
Patch ETA

Heuristic predictions, AS-IS, for prioritization only.

Mitigations

vendor Authored 2026-05-27

Vendor advisory: debian — https://security-tracker.debian.org/tracker/CVE-2019-9816

vendor Authored 2026-05-27

Vendor advisory: suse — https://www.suse.com/security/cve/CVE-2019-9816.html

vendor Authored 2026-05-27

Vendor advisory: arch — https://security.archlinux.org/ASA-201905-8

vendor Authored 2026-05-27

Vendor advisory: arch — https://security.archlinux.org/ASA-201905-9

OS impact

OSVersionStatusFixed in
arch archfixed67.0-1
suse slesaffected
debian debiansidfixed67.0-2
debian debianbookwormfixed60.7.0esr-1
debian debianbullseyefixed60.7.0esr-1
debian debianforkyfixed60.7.0esr-1
debian debiantrixiefixed60.7.0esr-1

References

Verify integrity in audit chain (admin only). AS-IS.