High severity · published Oct 22, 2026
CVE-2026-114720
Roundcube Webmail before 1.6.20 and 1.7.x before 1.7.5 is affected by an IMAP command injection vulnerability
New
7.1
CVSS
0.8%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:N
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
Low
Integrity
High
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.8% · higher than 57% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
WE
Webmail · Roundcube
1.6.0 before 1.6.20; 1.7.0 before 1.7.5 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-114720
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-114720
bugs.debian.org
https://bugs.debian.org/1151279
github.com
https://github.com/roundcube/roundcubemail/commit/242c6d6a150c850bd96d20d400261e71f8d11f9b
github.com
https://github.com/roundcube/roundcubemail/commit/6c3c1897c11e193e47fccaabc87e9ca2a0a73e51
github.com
https://github.com/roundcube/roundcubemail/releases/tag/1.6.20
github.com
https://github.com/roundcube/roundcubemail/releases/tag/1.7.5
roundcube.net
https://roundcube.net/news/2026/10/19/security-updates-1.6.20-and-1.7.5
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