CVE-2026-74997

Description

In Roundcube Webmail before 1.6.18 and 1.7.x before 1.7.3, the cmd_learn driver of the markasjunk plugin is subject to remote code execution via crafted placeholder replacement values. This issue only affects Roundcube instances using the markasjunk plugin with its cmd_learn driver.

Affected Platforms

Weakness Type

CWE-78

References

• https://github.com/roundcube/roundcubemail/commit/14044f843cfacbe78b042f659e379d…
• https://github.com/roundcube/roundcubemail/commit/495d211638f222336b20f4744545c5…
• https://github.com/roundcube/roundcubemail/commit/b8f90e28a46d42e79a69568cba897f…
• https://github.com/roundcube/roundcubemail/releases/tag/1.6.18
• https://github.com/roundcube/roundcubemail/releases/tag/1.7.3
• https://roundcube.net/news/2026/08/09/security-updates-1.6.18-and-1.7.3