What is GHSA-3q74-4f83-x4rj?

GHSA-3q74-4f83-x4rj is a security advisory published by GitHub Security Advisories with Critical severity. Malicious calendar invitations could use file URI attachments to launch local or network-hosted...

Which CVE IDs does GHSA-3q74-4f83-x4rj cover?

GHSA-3q74-4f83-x4rj covers the following CVE IDs: CVE-2026-84637. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

What is the CVSS v3 score of GHSA-3q74-4f83-x4rj?

GHSA-3q74-4f83-x4rj has a CVSS v3 base score of 9.8, published by GitHub Security Advisories.

GHSA-3q74-4f83-x4rjCriticalCVSS 9.8

Malicious calendar invitations could use file URI attachments to launch local or network-hosted...

Vendor

GitHub Security Advisories

Published

September 2, 2026

Last Modified

September 2, 2026

🔗 CVE IDs covered (1)

CVE-2026-84637 →

📋 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.

🔗 References (5)

https://nvd.nist.gov/vuln/detail/CVE-2026-84637
https://bugzilla.mozilla.org/show_bug.cgi?id=2043878
https://www.mozilla.org/security/advisories/mfsa2026-78
https://www.mozilla.org/security/advisories/mfsa2026-88
https://github.com/advisories/GHSA-3q74-4f83-x4rj