CVE-2026-75002
Received Received - Intake

Roundcube Webmail IMAP Command Injection Vulnerability

Publication date: 2026-08-17

Last updated on: 2026-08-17

Assigner: MITRE

Description
In Roundcube Webmail before 1.6.18 and 1.7.x before 1.7.3, mail search and LITERAL+ byte-count desynchronization could lead to information disclosure or privilege escalation via IMAP command injection.

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Meta Information

Published
2026-08-17
Last Modified
2026-08-17
Generated
2026-08-17
AI Q&A
2026-08-17
EPSS Evaluated
N/A
NVD
CVE-2026-75002
EUVD
EUVD-2026-60168

Affected Vendors & Products

Showing 2 associated CPEs
Vendor Product Version / Range
roundcube roundcube to 1.6.18 (exc)
roundcube roundcube From 1.7.0 (inc) to 1.7.3 (exc)

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-77 The product constructs all or part of a command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended command when it is sent to a downstream component.

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Executive Summary

This vulnerability exists in Roundcube Webmail versions before 1.6.18 and 1.7.x before 1.7.3. It involves desynchronization in mail search and LITERAL+ byte-count handling, which could allow IMAP command injection. This may lead to unauthorized access or elevated privileges.

Detection Guidance

To detect this vulnerability, check the Roundcube Webmail version installed on your system. If it is version 1.6.x before 1.6.18 or 1.7.x before 1.7.3, it is vulnerable. Run commands like 'grep -r "Roundcube" /var/www/' or check package managers such as 'dpkg -l | grep roundcube' or 'rpm -qa | grep roundcube' to identify the version.

Impact Analysis

An attacker could exploit this to gain access to sensitive emails, modify or delete messages, or escalate their privileges within the Roundcube system. This could compromise confidentiality, integrity, and availability of email data.

Compliance Impact

This vulnerability could lead to unauthorized access or disclosure of personal or health data, violating GDPR or HIPAA requirements. Organizations using vulnerable versions may face compliance violations, legal penalties, and reputational damage.

Mitigation Strategies

Upgrade Roundcube Webmail to version 1.6.18 or later if using 1.6.x, or to version 1.7.3 or later if using 1.7.x. This addresses the IMAP command injection vulnerability.

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