Vulnerability · Published Oct 22, 2026 · Assigned by mitre
CVE-2026-114720
High 7.1
In plain English
A high-severity security flaw in Webmail from Roundcube. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.8% (higher than 57% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | roundcube | no fix listed | DEBIAN-CVE-2026-114720 |
| Debian:13 | roundcube | 1.6.20+dfsg-0+deb13u1 | DEBIAN-CVE-2026-114720 |
| Debian:14 | roundcube | 1.6.20+dfsg-1 | DEBIAN-CVE-2026-114720 |
| Ubuntu:26.10 | roundcube | no fix listed | UBUNTU-CVE-2026-114720 |
Affected products (as reported)
Weakness: CWE-93 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:N
References
- https://bugs.debian.org/1151279 issue-tracking, third-party-advisory
- https://github.com/roundcube/roundcubemail/commit/6c3c1897c11e193e47fccaabc87e9ca2a0a73e51 patch
- https://roundcube.net/news/2026/10/19/security-updates-1.6.20-and-1.7.5 vendor-advisory, release-notes
- https://github.com/roundcube/roundcubemail/releases/tag/1.7.5 release-notes, patch
- https://github.com/roundcube/roundcubemail/releases/tag/1.6.20 release-notes, patch
- https://github.com/roundcube/roundcubemail/commit/242c6d6a150c850bd96d20d400261e71f8d11f9b patch