Remote Code Execution Vulnerability in Roundcube Webmail Markasjunk Plugin
CVE-2026-74997

8.8HIGH

Key Information:

Vendor

Roundcube

Status
Webmail
Vendor
CVE Published:
17 August 2026

What is CVE-2026-74997?

A critical vulnerability in the cmd_learn driver of the markasjunk plugin in Roundcube Webmail allows for potential remote code execution due to improperly handled placeholder replacement values. This affects users running versions prior to 1.6.18 and 1.7.x prior to 1.7.3. Administrators are urged to secure their installations by updating to the latest versions to mitigate this risk.

Affected Version(s)

Webmail 1.6.0 < 1.6.18

Webmail 1.7.0 < 1.7.3

References

https://roundcube.net/news/2026/08/09/security-updates-1....
https://github.com/roundcube/roundcubemail/releases/tag/1...
https://github.com/roundcube/roundcubemail/commit/b8f90e2...

CVSS V3.1

Score:
8.8
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
Low
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.