CVE catalog

CVE-2026-84637

Severity: Critical · CVSS 9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Published: Sep 1, 2026, 9:25:08 PM UTC
Updated: Sep 1, 2026, 10:17:19 PM UTC
Source: [NVD] · [CVE record]
EPSS: 0.63% · Oct 25, 2026

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.

Vulnerable and fixed packages

Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.

Distribution	Package	Release	Version	Status
Debian	thunderbird	sid	`1:153.5.1esr-1`	not affected
Debian	thunderbird	forky	`1:153.5.0esr-1`	not affected
Debian	thunderbird	trixie	`1:140.12.0esr-1~deb13u1`	not affected
Debian	thunderbird	trixie-security	`1:153.5.1esr-1~deb13u2`	not affected
Debian	thunderbird	bookworm	`1:140.12.0esr-1~deb12u1`	not affected
Debian	thunderbird	bookworm-security	`1:153.5.1esr-1~deb12u1`	not affected
Cpe	thunderbird	Not reported	`155.0`	fixed

Fixed-version evidence

Distribution	Package	Type	Release	Fixed version	Urgency	Origin	Bugs
Debian	thunderbird	source	sid	`Not affected`	unimportant	Not reported	Not reported
Debian	thunderbird	source	forky	`Not affected`	unimportant	Not reported	Not reported
Debian	thunderbird	source	trixie	`Not affected`	unimportant	Not reported	Not reported
Debian	thunderbird	source	bookworm	`Not affected`	unimportant	Not reported	Not reported
Cpe	thunderbird	cpe	Not reported	`155.0`	Not reported	NVD-CVE-2026-84637	Not reported

OpenFactory catalog packages

[Debian 12 (Bookworm)]

[thunderbird]Not affected
Details (4)
- 1:140.12.0esr-1~deb12u1 · amd64 · bookworm
  Not affected
  nvd · thunderbird · debian · bookworm
- 1:140.12.0esr-1~deb12u1 · arm64 · bookworm
  Not affected
  nvd · thunderbird · debian · bookworm
- 1:140.14.0esr-1~deb12u1 · amd64 · bookworm-security
  Not affected
  nvd · thunderbird · debian · bookworm
- 1:140.14.0esr-1~deb12u1 · arm64 · bookworm-security
  Not affected
  nvd · thunderbird · debian · bookworm
[thunderbird-l10n-af]Not affected
Source package: [thunderbird]
Details (4)
- 1:140.12.0esr-1~deb12u1 · all · bookworm
  Not affected
  nvd · thunderbird · debian · bookworm
- 1:140.12.0esr-1~deb12u1 · all · bookworm
  Not affected
  nvd · thunderbird · debian · bookworm
- 1:140.14.0esr-1~deb12u1 · all · bookworm-security
  Not affected
  nvd · thunderbird · debian · bookworm
- 1:140.14.0esr-1~deb12u1 · all · bookworm-security
  Not affected
  nvd · thunderbird · debian · bookworm
[thunderbird-l10n-all]Not affected
Source package: [thunderbird]
Details (4)
- 1:140.12.0esr-1~deb12u1 · all · bookworm
  Not affected
  nvd · thunderbird · debian · bookworm
- 1:140.12.0esr-1~deb12u1 · all · bookworm
  Not affected
  nvd · thunderbird · debian · bookworm
- 1:140.14.0esr-1~deb12u1 · all · bookworm-security
  Not affected
  nvd · thunderbird · debian · bookworm
- 1:140.14.0esr-1~deb12u1 · all · bookworm-security
  Not affected
  nvd · thunderbird · debian · bookworm
[thunderbird-l10n-ar]Not affected
Source package: [thunderbird]
Details (4)
- 1:140.12.0esr-1~deb12u1 · all · bookworm
  Not affected
  nvd · thunderbird · debian · bookworm
- 1:140.12.0esr-1~deb12u1 · all · bookworm
  Not affected
  nvd · thunderbird · debian · bookworm
- 1:140.14.0esr-1~deb12u1 · all · bookworm-security
  Not affected
  nvd · thunderbird · debian · bookworm
- 1:140.14.0esr-1~deb12u1 · all · bookworm-security
  Not affected
  nvd · thunderbird · debian · bookworm
[thunderbird-l10n-ast]Not affected
Source package: [thunderbird]
Details (4)
- 1:140.12.0esr-1~deb12u1 · all · bookworm
  Not affected
  nvd · thunderbird · debian · bookworm
- 1:140.12.0esr-1~deb12u1 · all · bookworm
  Not affected
  nvd · thunderbird · debian · bookworm
- 1:140.14.0esr-1~deb12u1 · all · bookworm-security
  Not affected
  nvd · thunderbird · debian · bookworm
- 1:140.14.0esr-1~deb12u1 · all · bookworm-security
  Not affected
  nvd · thunderbird · debian · bookworm
[thunderbird-l10n-be]Not affected
Source package: [thunderbird]
Details (4)
- 1:140.12.0esr-1~deb12u1 · all · bookworm
  Not affected
  nvd · thunderbird · debian · bookworm
- 1:140.12.0esr-1~deb12u1 · all · bookworm
  Not affected
  nvd · thunderbird · debian · bookworm
- 1:140.14.0esr-1~deb12u1 · all · bookworm-security
  Not affected
  nvd · thunderbird · debian · bookworm
- 1:140.14.0esr-1~deb12u1 · all · bookworm-security
  Not affected
  nvd · thunderbird · debian · bookworm
[thunderbird-l10n-bg]Not affected
Source package: [thunderbird]
Details (4)
- 1:140.12.0esr-1~deb12u1 · all · bookworm
  Not affected
  nvd · thunderbird · debian · bookworm
- 1:140.12.0esr-1~deb12u1 · all · bookworm
  Not affected
  nvd · thunderbird · debian · bookworm
- 1:140.14.0esr-1~deb12u1 · all · bookworm-security
  Not affected
  nvd · thunderbird · debian · bookworm
- 1:140.14.0esr-1~deb12u1 · all · bookworm-security
  Not affected
  nvd · thunderbird · debian · bookworm
[thunderbird-l10n-br]Not affected
Source package: [thunderbird]
Details (4)
- 1:140.12.0esr-1~deb12u1 · all · bookworm
  Not affected
  nvd · thunderbird · debian · bookworm
- 1:140.12.0esr-1~deb12u1 · all · bookworm
  Not affected
  nvd · thunderbird · debian · bookworm
- 1:140.14.0esr-1~deb12u1 · all · bookworm-security
  Not affected
  nvd · thunderbird · debian · bookworm
- 1:140.14.0esr-1~deb12u1 · all · bookworm-security
  Not affected
  nvd · thunderbird · debian · bookworm
[thunderbird-l10n-ca]Not affected
Source package: [thunderbird]
Details (4)
- 1:140.12.0esr-1~deb12u1 · all · bookworm
  Not affected
  nvd · thunderbird · debian · bookworm
- 1:140.12.0esr-1~deb12u1 · all · bookworm
  Not affected
  nvd · thunderbird · debian · bookworm
- 1:140.14.0esr-1~deb12u1 · all · bookworm-security
  Not affected
  nvd · thunderbird · debian · bookworm
- 1:140.14.0esr-1~deb12u1 · all · bookworm-security
  Not affected
  nvd · thunderbird · debian · bookworm
[thunderbird-l10n-cak]Not affected
Source package: [thunderbird]
Details (4)
- 1:140.12.0esr-1~deb12u1 · all · bookworm
  Not affected
  nvd · thunderbird · debian · bookworm
- 1:140.12.0esr-1~deb12u1 · all · bookworm
  Not affected
  nvd · thunderbird · debian · bookworm
- 1:140.14.0esr-1~deb12u1 · all · bookworm-security
  Not affected
  nvd · thunderbird · debian · bookworm
- 1:140.14.0esr-1~deb12u1 · all · bookworm-security
  Not affected
  nvd · thunderbird · debian · bookworm
[thunderbird-l10n-cs]Not affected
Source package: [thunderbird]
Details (4)
- 1:140.12.0esr-1~deb12u1 · all · bookworm
  Not affected
  nvd · thunderbird · debian · bookworm
- 1:140.12.0esr-1~deb12u1 · all · bookworm
  Not affected
  nvd · thunderbird · debian · bookworm
- 1:140.14.0esr-1~deb12u1 · all · bookworm-security
  Not affected
  nvd · thunderbird · debian · bookworm
- 1:140.14.0esr-1~deb12u1 · all · bookworm-security
  Not affected
  nvd · thunderbird · debian · bookworm
[thunderbird-l10n-cy]Not affected
Source package: [thunderbird]
Details (4)
- 1:140.12.0esr-1~deb12u1 · all · bookworm
  Not affected
  nvd · thunderbird · debian · bookworm
- 1:140.12.0esr-1~deb12u1 · all · bookworm
  Not affected
  nvd · thunderbird · debian · bookworm
- 1:140.14.0esr-1~deb12u1 · all · bookworm-security
  Not affected
  nvd · thunderbird · debian · bookworm
- 1:140.14.0esr-1~deb12u1 · all · bookworm-security
  Not affected
  nvd · thunderbird · debian · bookworm
[thunderbird-l10n-da]Not affected
Source package: [thunderbird]
Details (4)
- 1:140.12.0esr-1~deb12u1 · all · bookworm
  Not affected
  nvd · thunderbird · debian · bookworm
- 1:140.12.0esr-1~deb12u1 · all · bookworm
  Not affected
  nvd · thunderbird · debian · bookworm
- 1:140.14.0esr-1~deb12u1 · all · bookworm-security
  Not affected
  nvd · thunderbird · debian · bookworm
- 1:140.14.0esr-1~deb12u1 · all · bookworm-security
  Not affected
  nvd · thunderbird · debian · bookworm
[thunderbird-l10n-de]Not affected
Source package: [thunderbird]
Details (4)
- 1:140.12.0esr-1~deb12u1 · all · bookworm
  Not affected
  nvd · thunderbird · debian · bookworm
- 1:140.12.0esr-1~deb12u1 · all · bookworm
  Not affected
  nvd · thunderbird · debian · bookworm
- 1:140.14.0esr-1~deb12u1 · all · bookworm-security
  Not affected
  nvd · thunderbird · debian · bookworm
- 1:140.14.0esr-1~deb12u1 · all · bookworm-security
  Not affected
  nvd · thunderbird · debian · bookworm
[thunderbird-l10n-dsb]Not affected
Source package: [thunderbird]
Details (4)
- 1:140.12.0esr-1~deb12u1 · all · bookworm
  Not affected
  nvd · thunderbird · debian · bookworm
- 1:140.12.0esr-1~deb12u1 · all · bookworm
  Not affected
  nvd · thunderbird · debian · bookworm
- 1:140.14.0esr-1~deb12u1 · all · bookworm-security
  Not affected
  nvd · thunderbird · debian · bookworm
- 1:140.14.0esr-1~deb12u1 · all · bookworm-security
  Not affected
  nvd · thunderbird · debian · bookworm
[thunderbird-l10n-el]Not affected
Source package: [thunderbird]
Details (4)
- 1:140.12.0esr-1~deb12u1 · all · bookworm
  Not affected
  nvd · thunderbird · debian · bookworm
- 1:140.12.0esr-1~deb12u1 · all · bookworm
  Not affected
  nvd · thunderbird · debian · bookworm
- 1:140.14.0esr-1~deb12u1 · all · bookworm-security
  Not affected
  nvd · thunderbird · debian · bookworm
- 1:140.14.0esr-1~deb12u1 · all · bookworm-security
  Not affected
  nvd · thunderbird · debian · bookworm
[thunderbird-l10n-en-ca]Not affected
Source package: [thunderbird]
Details (4)
- 1:140.12.0esr-1~deb12u1 · all · bookworm
  Not affected
  nvd · thunderbird · debian · bookworm
- 1:140.12.0esr-1~deb12u1 · all · bookworm
  Not affected
  nvd · thunderbird · debian · bookworm
- 1:140.14.0esr-1~deb12u1 · all · bookworm-security
  Not affected
  nvd · thunderbird · debian · bookworm
- 1:140.14.0esr-1~deb12u1 · all · bookworm-security
  Not affected
  nvd · thunderbird · debian · bookworm
[thunderbird-l10n-en-gb]Not affected
Source package: [thunderbird]
Details (4)
- 1:140.12.0esr-1~deb12u1 · all · bookworm
  Not affected
  nvd · thunderbird · debian · bookworm
- 1:140.12.0esr-1~deb12u1 · all · bookworm
  Not affected
  nvd · thunderbird · debian · bookworm
- 1:140.14.0esr-1~deb12u1 · all · bookworm-security
  Not affected
  nvd · thunderbird · debian · bookworm
- 1:140.14.0esr-1~deb12u1 · all · bookworm-security
  Not affected
  nvd · thunderbird · debian · bookworm
[thunderbird-l10n-es-ar]Not affected
Source package: [thunderbird]
Details (4)
- 1:140.12.0esr-1~deb12u1 · all · bookworm
  Not affected
  nvd · thunderbird · debian · bookworm
- 1:140.12.0esr-1~deb12u1 · all · bookworm
  Not affected
  nvd · thunderbird · debian · bookworm
- 1:140.14.0esr-1~deb12u1 · all · bookworm-security
  Not affected
  nvd · thunderbird · debian · bookworm
- 1:140.14.0esr-1~deb12u1 · all · bookworm-security
  Not affected
  nvd · thunderbird · debian · bookworm
[thunderbird-l10n-es-es]Not affected
Source package: [thunderbird]
Details (4)
- 1:140.12.0esr-1~deb12u1 · all · bookworm
  Not affected
  nvd · thunderbird · debian · bookworm
- 1:140.12.0esr-1~deb12u1 · all · bookworm
  Not affected
  nvd · thunderbird · debian · bookworm
- 1:140.14.0esr-1~deb12u1 · all · bookworm-security
  Not affected
  nvd · thunderbird · debian · bookworm
- 1:140.14.0esr-1~deb12u1 · all · bookworm-security
  Not affected
  nvd · thunderbird · debian · bookworm

Next results

Observed: Oct 27, 2026, 7:29:41 PM UTC

References

[CERT-Bund public advisories] · [Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [Red Hat security advisories and VEX] · [SUSE security advisories and VEX]