CVE-2021-43528

Mozilla: JavaScript unexpectedly enabled for the composition area

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Severity

Low

Red Hat Product Security

6.3

CVSS 3.1

Review impact separately from score.

Published · December 7, 2021

Updated · November 22, 2025

Description

Thunderbird unexpectedly enabled JavaScript in the composition area. The JavaScript execution context was limited to this area and did not receive chrome-level privileges, but could be used as a stepping stone to further an attack with other vulnerabilities. This vulnerability affects Thunderbird < 91.4.0.

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 3.1 · 6.3
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L

CWE-281 · Improper Preservation of Permissions