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CVE WatchSep 1, 2026

CVE-2026-84637

Malicious calendar invitations could use file URI attachments to launch local or network-hosted executables on Windows, bypassing Thunderbir

CVSS

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No CVSS

EPSS

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KEV

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Exploit Today

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0-100

Published: Sep 1, 2026 · Last modified: Sep 1, 2026

EPSS · 30d

Not enough EPSS history yet.

Technical description

Malicious calendar invitations could use file URI attachments to launch local or network-hosted executables on Windows, bypassing Thunderbird's normal executable attachment protections. With the new invitation display enabled, the attachment could also appear under a misleading filename. This vulnerability was fixed in Thunderbird 154 and Thunderbird 153.2.

Official references
Related CVEs

No related CVEs by CWE or product.