Calendar invitation attachments could launch local executables

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-84637
StatePUBLISHED
Assignermozilla
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-01 22:17:19 UTC
Updated2026-09-01 22:17:19 UTC
DescriptionMalicious 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.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Mozilla Thunderbird unaffected 153.2 153.* rpm Not specified
CNA Mozilla Thunderbird unaffected 154 * rpm Not specified

References

ReferenceSourceLinkTags
www.mozilla.org/security/advisories/mfsa2026-78 [email protected] www.mozilla.org
www.mozilla.org/security/advisories/mfsa2026-88 [email protected] www.mozilla.org
bugzilla.mozilla.org/show_bug.cgi [email protected] bugzilla.mozilla.org
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: Trung Nguyen (en)

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