Bug 2527103 (CVE-2026-84637) - CVE-2026-84637 thunderbird: Thunderbird: Arbitrary code execution via malicious calendar invitation attachments
Summary: CVE-2026-84637 thunderbird: Thunderbird: Arbitrary code execution via malicio...
Keywords:
Status: NEW
Alias: CVE-2026-84637
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
high
high
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-09-01 21:32 UTC by OSIDB Bzimport
Modified: 2026-09-01 21:36 UTC (History)
5 users (show)

Fixed In Version:
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Description OSIDB Bzimport 2026-09-01 21:32:15 UTC 
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.
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