CVE-2026-62644 Roundcube CVE debrief

Who should care

System administrators and security teams responsible for managing Roundcube Webmail installations should prioritize patching this vulnerability to prevent potential account takeovers. This includes reviewing the supplied official advisory or CVE record to validate affected scope, severity, and vendor guidance.

Technical summary

The password plugin of Roundcube Webmail was subject to username spoofing via session data. This vulnerability, CVE-2026-62644, has a CVSS score of 6.4 and is classified as MEDIUM. It requires Local access, User interaction, and can result in High impact on Confidentiality and Integrity. The vulnerability affects Roundcube Webmail versions before 1.6.17 and 1.7.x before 1.7.2. System administrators should verify installed versions and apply updates immediately to prevent potential account takeovers. Review compensating controls for exposed systems while remediation is scheduled and verified. Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up.

Defensive priority

Patching Roundcube Webmail to version 1.6.17 or 1.7.2 is crucial to prevent potential exploitation. Verify installed versions and apply updates immediately. Review compensating controls for exposed systems while remediation is scheduled and verified.

Recommended defensive actions

• Apply patches to update Roundcube Webmail to version 1.6.17 or 1.7.2
• Verify and inventory affected Roundcube Webmail installations
• Monitor for suspicious activity related to Roundcube Webmail sessions
• Review compensating controls for exposed systems while remediation is scheduled and verified
• Check relevant monitoring, detection, and logs for exposed assets that need extra review
• Track exceptions, retest remediated assets, and close the item only after evidence is documented
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up

Evidence notes

The CVE record was published on 2026-07-14T16:17:04.810Z and was last modified on 2026-07-20T12:41:22.573Z. The NVD entry is currently Analyzed. This information is based on the NVD entry and the CVE record. The vulnerability affects Roundcube Webmail versions before 1.6.17 and 1.7.x before 1.7.2. The evidence is limited, and defenders should verify the affected scope and vendor guidance.

Official resources