CVE-2026-84144

Internally found bugs present in Thunderbird 154 and Thunderbird ESR 153.1. Some of these bugs showed evidence of memory corruption or another security-relevant defect and we presume that with enough effort some of these could have been exploited. This vulnerability was fixed in Firefox 155, Firefox ESR 153.2, Thunderbird 155, and Thunderbird 153.2.

• CWE-119

• https://bugzilla.mozilla.org/buglist.cgi?bug_id=2054619%2C2054620%2C2054624%2C2054702%2C2054726%2C2054775%2C2055703%2C2058006%2C2058013%2C2058098%2C2058627%2C2058661%2C2059127%2C2059128%2C2059180%2C2059199%2C2059205%2C2061320%2C2061430%2C2061495%2C2061505%2C2061532%2C2061799Broken Link
• https://bugzilla.mozilla.org/buglist.cgi?bug_id=2054625%2C2059002%2C2061775Broken Link
• https://bugzilla.mozilla.org/buglist.cgi?bug_id=2054691%2C2058085%2C2059144%2C2059191%2C2059192%2C2061521%2C2062395%2C2062404Broken Link
• https://www.mozilla.org/security/advisories/mfsa2026-82/Vendor Advisory
• https://www.mozilla.org/security/advisories/mfsa2026-85/Vendor Advisory
• https://www.mozilla.org/security/advisories/mfsa2026-86/Vendor Advisory
• https://www.mozilla.org/security/advisories/mfsa2026-88/Vendor Advisory

Published

Sep 1, 2026

Last Modified

Sep 3, 2026

Status

Analyzed

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
• Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
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