Vulnerabilities
Vulnerable Software

Vulnerability Details CVE-2026-84642

The values of the mail.allowed_attachment_hostnames advanced config setting were used in a regular expression without escaping. For some possible valid hostnames, this could allow certain unintended hostnames to also match and serve remote attachments. This vulnerability was fixed in Thunderbird 155 and Thunderbird 153.2.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.003
EPSS Ranking 19.0%
CVSS Severity
CVSS v3 Score 7.5
Products affected by CVE-2026-84642


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