Description
Roundcube Webmail before 1.6.20 and 1.7.x before 1.7.5 are affected by IMAP command injection. A remote authenticated attacker can exploit this via CRLF sequences injected into the _uid parameter of the mail/headers and mail/viewsource actions to execute arbitrary IMAP commands.
References7
- bugs.debian.org/1151279
- github.com/roundcube/roundcubemail/commit/004adaaeca4f6799715a5…
- github.com/roundcube/roundcubemail/commit/bf5bc0266a8cd16be6b64…
- github.com/roundcube/roundcubemail/commit/f62879defc0330ae240c7…
- 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
Metrics
- CVSS 3.1
-
7.1
HIGH
Score source: CNA
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:N - EPSS — exploit probability
- 1% percentile: 63 · as of 9 November 2026
- CWE
- CWE-93
Could this be exploited in your environment?
A patch closes the known hole. A penetration test shows what an attacker can still reach — with proof.