CVE-2026-74997 PUBLISHED

Assigner: mitre
Reserved: 17.08.2026 Published: 17.08.2026 Updated: 17.08.2026

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.

Metrics

CVSS 3.1

CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CVSS Score: 8.8

Attack Vector	Network	Scope	Unchanged
Attack Complexity	Low	Confidentiality Impact	High
Privileges Required	Low	Integrity Impact	High
User Interaction	None	Availability Impact	High

CVSS 3.1

Product Status

Vendor	Roundcube
Product	Webmail
Versions	Default: unaffected affected from 1.6.0 to 1.6.18 (excl.) affected from 1.7.0 to 1.7.3 (excl.)

References

https://roundcube.net/news/2026/08/09/security-updates-1.6.18-and-1.7.3
https://github.com/roundcube/roundcubemail/releases/tag/1.6.18
https://github.com/roundcube/roundcubemail/commit/b8f90e28a46d42e79a69568cba897f8f4223d9cd
https://github.com/roundcube/roundcubemail/commit/495d211638f222336b20f4744545c53712426c2a
https://github.com/roundcube/roundcubemail/releases/tag/1.7.3
https://github.com/roundcube/roundcubemail/commit/14044f843cfacbe78b042f659e379d6b4497aa7c

Problem Types

CWE-78 Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection') CWE