CVE-2026-74997

Name of the Vulnerable Software and Affected Versions Roundcube Webmail versions prior to 1.6.18 Roundcube Webmail versions 1.7.x prior to 1.7.3

Description The cmd learn driver of the markasjunk plugin allows remote code execution through the use of crafted placeholder replacement values. This issue specifically impacts instances where the markasjunk plugin is active and configured to use the cmd learn driver.

Recommendations Update to version 1.6.18 or later. Update to version 1.7.3 or later. As a temporary mitigation, disable the markasjunk plugin or stop using the cmd learn driver.