What is CVE-2026-74997?

CVE-2026-74997 is a high-severity vulnerability in Roundcube Webmail, classified under OS Command Injection. CVSS score: 8.8/10. Published 2026-08-17.

How severe is CVE-2026-74997?

High severity. CVSS v3 base score is 8.8 out of 10.

RCE in Roundcube Webmail

CVE-2026-74997

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.

Vulnerability class: Command Injection (OS Command Injection)

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

Affected products

Roundcube Webmail — versions 1.6.0, 1.7.0

Weakness classification (CWE)

CWE-78 — OS Command Injection

References

cve@mitre.org
cve@mitre.org
cve@mitre.org
cve@mitre.org
cve@mitre.org
cve@mitre.org

Frequently asked questions

What is CVE-2026-74997?: CVE-2026-74997 is a high-severity vulnerability in Roundcube Webmail, classified under OS Command Injection. CVSS score: 8.8/10. Published 2026-08-17.
How severe is CVE-2026-74997?: High severity. CVSS v3 base score is 8.8 out of 10.