VULNERABILITY INTELLIGENCE
CVE-2018-18509
CVSS score5.3 MEDIUM
EPSS probability1.68%
CISA KEVNot currently listed
Published2019-04-26
Last modified2026-06-17
CVSS vectorCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
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.
Weakness classification
- CWE-347: Improper Verification of Cryptographic Signature
Primary references
- security@mozilla.org
- security@mozilla.org — Third Party Advisory, VDB Entry
- security@mozilla.org — Mailing List, Third Party Advisory
- security@mozilla.org — Mailing List, Third Party Advisory
- security@mozilla.org
- security@mozilla.org — Issue Tracking, Permissions Required, Vendor Advisory
- security@mozilla.org
- security@mozilla.org
- security@mozilla.org — Vendor Advisory
- af854a3a-2127-422b-91ae-364da2661108
- af854a3a-2127-422b-91ae-364da2661108 — Third Party Advisory, VDB Entry
- af854a3a-2127-422b-91ae-364da2661108 — Mailing List, Third Party Advisory