[ CVE-2026-114720 · Published 22 Oct 2026 ]
Vulnerability in Roundcube Webmail
CVSS 7.1
EPSS <1%1 agency advisoryNo fix listed yet
[ Description ]Official description
Roundcube Webmail before 1.6.20 and 1.7.x before 1.7.5 is affected by an IMAP command injection vulnerability. A remote authenticated attacker can exploit this via CRLF sequences injected into the _flag parameter of the mail/mark action to execute arbitrary IMAP commands. Upstream fixed this in the commit “Fix IMAP command injection via CRLF in `_flag` parameter of mail/mark action”, which rejects flags containing control, whitespace and IMAP-special characters.
[ Fixes ]Fixes and patches
No fix or interim patch is linked from our sources yet. Check the vendor references below and limit exposure of affected systems until a fix is available.
[ Advisories ]Government CERT advisories
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BSI CERT-BundWID-SEC-2026-4043
Roundcube Webmail: Multiple vulnerabilities Translated from German
[ References ]References
- bugs.debian.org/1151279
- github.com/roundcube/roundcubemail/commit/242c6d6a150c850bd96d20d400261e71f8d11f9b
- github.com/roundcube/roundcubemail/commit/6c3c1897c11e193e47fccaabc87e9ca2a0a73e51
- github.com/roundcube/roundcubemail/releases/tag/1.6.20
- github.com/roundcube/roundcubemail/releases/tag/1.7.5
- roundcube.net/news/2026/10/19/security-updates-1.6.20-and-1.7.5