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CVE-2026-74997

8.8 · HIGH

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.

Published Aug 17, 2026CWE-78EPSS 1.13%

Overview

CVE-2026-74997 is a high-severity vulnerability. It was published on August 17, 2026 and has a CVSS 3.1 base score of 8.8 (HIGH).

This vulnerability has a CVSS 3.1 base score of 8.8, rated HIGH. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

GitHubgithub.com/roundcube/roundcubemail/commit/14044f843cfacbe78b042f659e379d6b4497aa7cGitHubgithub.com/roundcube/roundcubemail/commit/495d211638f222336b20f4744545c53712426c2aGitHubgithub.com/roundcube/roundcubemail/commit/b8f90e28a46d42e79a69568cba897f8f4223d9cdGitHubgithub.com/roundcube/roundcubemail/releases/tag/1.6.18GitHubgithub.com/roundcube/roundcubemail/releases/tag/1.7.3Refroundcube.net/news/2026/08/09/security-updates-1.6.18-and-1.7.3

How CyberStrike helps

Frequently asked questions

What is CVE-2026-74997?

CVE-2026-74997 is a high-severity vulnerability. It was published on August 17, 2026 and has a CVSS 3.1 base score of 8.8 (HIGH).

How severe is CVE-2026-74997?

This vulnerability has a CVSS 3.1 base score of 8.8, rated HIGH. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2026-74997?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-74997?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-74997 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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