IMAP Command Injection Vulnerability in Roundcube Webmail by Roundcube
CVE-2026-114720

7.1HIGH

Key Information:

Vendor

Roundcube

Status
Webmail
Vendor
CVE Published:
22 October 2026

What is CVE-2026-114720?

Roundcube Webmail prior to version 1.6.20 and the 1.7.x series prior to 1.7.5 is susceptible to an IMAP command injection. This vulnerability allows a remote authenticated attacker to exploit the application using CRLF sequences injected into the _flag parameter during the mail/mark action. By doing so, the attacker can execute arbitrary IMAP commands. The vulnerability was addressed in the upstream commit that restricts flags by rejecting those containing control characters, whitespace, or special IMAP symbols.

Affected Version(s)

Webmail 1.6.0 < 1.6.20

Webmail 1.7.0 < 1.7.5

References

https://bugs.debian.org/1151279
issue-trackingthird-party-advisory
https://github.com/roundcube/roundcubemail/commit/6c3c189...
patch
https://roundcube.net/news/2026/10/19/security-updates-1....
vendor-advisoryrelease-notes

CVSS V3.1

Score:
7.1
Severity:
HIGH
Confidentiality:
Low
Integrity:
High
Availability:
Low
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
Low
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.