CVE-2026-74997 Command injection in Webmail
Attackers can execute arbitrary code on Roundcube Webmail servers using the markasjunk plugin's cmd_learn driver via crafted inputs.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-74997?
CVE-2026-74997 is a high-severity command injection vulnerability in Roundcube Webmail, published on 17 Aug 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official 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.
Weakness: CWE-78
Which versions are affected by CVE-2026-74997?
It affects 1 product.
Products include Roundcube Webmail.
How do I fix CVE-2026-74997?
Upgrade to a fixed version.
Upgrade, and pass arguments to programs as a list instead of through a shell. More about Command injection.
Is CVE-2026-74997 being exploited?
There is no known exploitation of CVE-2026-74997 in the wild and no public exploit code.
Other vulnerabilities in Roundcube Webmail
Sources
Also known as DEBIAN-CVE-2026-74997, GHSA-q5rh-mmp4-ppgq, UBUNTU-CVE-2026-74997.