CVE-2019-9147: Mailvelope

Medium severity, CVSS 4.3. EPSS: 1.4% chance of exploitation in the next 30 days.

Mailvelope prior to 3.1.0 is vulnerable to a clickjacking attack against the settings page. As the settings page is intended to be accessible from web applications, the browser's extension isolation mechanisms are disabled (web_accessible_resources). Mailvelope implements additional measures to prevent web applications from directly embedding the settings page, but this mechanism can be bypassed.

Affected products

• Mailvelope Mailvelope: before 3.1.0 (fixed in 3.1.0)

Published 2019-07-09. Last modified 2026-06-17.