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CVE-2026-118179 Details

ANALYZED

This CVE record has been analyzed and enriched by NVDAPI.com as an independent party.

Description

Clicking a news: or snews: link that referenced a message-ID made Thunderbird connect, without asking, to the host and port given in the link, even if it was not a configured news server. Line breaks in the message-ID were sent to the server unmodified, so a crafted link could send arbitrary commands to services reachable from the user's network. In addition, snews: links to such servers connected without TLS. This vulnerability was fixed in Thunderbird 159 and Thunderbird 153.6.

Metrics

CVSS 3.x Severity and Vector Strings:

VolerionCVSS-B:5.4 MEDIUMVector:CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N

CNA: CISA-ADPCVSS-B:8.8 HIGHVector:CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

References to Advisories, Solutions, and Tools

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URL	Source(s)	Tag(s)
https://bugzilla.mozilla.org/show_bug.cgi?id=2077789	[email protected]	Issue TrackingPermission RequiredVendor
https://www.mozilla.org/security/advisories/mfsa2026-121/	[email protected]	AdvisoryBundleRemedyVendor
https://www.mozilla.org/security/advisories/mfsa2026-122/	[email protected]	AdvisoryBundleRemedyVendor

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-20	Improper Input Validation	CISA-ADP

Affected Products

Product	Versions
Mozilla Thunderbird	All versions
CPE cpe:2.3:a:mozilla:thunderbird:::::::: Remediation Upgrade: 159moderate effort Upgrade: 153.6moderate effort

Change History

2 change records found show changes

Date	Action	Recorded By
Nov 4, 2026	CVE Modified	CISA-ADP
Oct 27, 2026	New CVE Received	[email protected]