CVE-2026-74997NVD

Vulnerability Summary

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.

Severity Level

HIGH(8.8)

Published Date

Aug 17, 2026

Last Modified

Aug 17, 2026

Exploitation Status

No confirmed exploitation yet

EPSS Score (30-Day)

0.77%Probability

Root Weakness (CWE)

CWE-78: OS Command Injection ↗

The software constructs all or part of an OS command using externally-influenced input, but does not properly neutralize special elements.

CVSS v3.1 Base Metrics

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredLow

User InteractionNone

ScopeUnchanged

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

External References

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

Critical Alert 1 Active Exploit Detected Today

CVE Watchtower

CVE-2026-74997NVD

Vulnerability Summary

External References