CVE-2018-18509

MediumCVSS 5.3/10Last modified Jun 17, 2026

Description

A flaw during verification of certain S/MIME signatures causes emails to be shown in Thunderbird as having a valid digital signature, even if the shown message contents aren't covered by the signature. The flaw allows an attacker to reuse a valid S/MIME signature to craft an email message with arbitrary content. This vulnerability affects Thunderbird < 60.5.1.

Metrics

CVSS 3.0 5.3/10CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

Weakness enumeration

CWE-347

Affected software

No affected versions have been published.

Timeline

Published: Apr 26, 2019
Last modified: Jun 17, 2026
NVD status: Modified

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