Vulnerability in Roundcube Webmail
CVE-2026-113386
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.
Vulnerability class: CRLF Injection
Published .
CVSS v3 metric
CVSS v3 base score 7.1 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:N.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
- bugs.debian.org/1151279 (issue-tracking, third-party-advisory)
- github.com/roundcube/roundcubemail/commit/004adaaeca4f6799715a54d12e3f657f19efc… (patch)
- roundcube.net/news/2026/10/19/security-updates-1.6.20-and-1.7.5 (release-notes, vendor-advisory)
- github.com/roundcube/roundcubemail/releases/tag/1.7.5 (release-notes, patch)
- github.com/roundcube/roundcubemail/releases/tag/1.6.20 (release-notes, patch)
- github.com/roundcube/roundcubemail/commit/f62879defc0330ae240c72b83b2d00a8ab337… (patch)
- github.com/roundcube/roundcubemail/commit/bf5bc0266a8cd16be6b640409e64a6c6c2705… (patch)
Frequently asked questions
- What is CVE-2026-113386?
- CVE-2026-113386 is a high-severity vulnerability in Roundcube Webmail, classified under CRLF Injection. CVSS score: 7.1/10. Published 2026-10-20.
- How severe is CVE-2026-113386?
- High severity. CVSS v3 base score is 7.1 out of 10.