Vulnerability · Published Oct 20, 2026 · Assigned by mitre
CVE-2026-113386
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 1.0% (higher than 63% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS 3.1)7.1High
Exploit odds (30 days)1.0%top 36.9% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official 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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | roundcube | no fix listed | DEBIAN-CVE-2026-113386 |
| Debian:13 | roundcube | 1.6.20+dfsg-0+deb13u1 | DEBIAN-CVE-2026-113386 |
| Debian:14 | roundcube | 1.6.20+dfsg-1 | DEBIAN-CVE-2026-113386 |
| Ubuntu:26.10 | roundcube | no fix listed | UBUNTU-CVE-2026-113386 |
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/004adaaeca4f6799715a54d12e3f657f19efcc9a 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/f62879defc0330ae240c72b83b2d00a8ab337447 patch
- https://github.com/roundcube/roundcubemail/commit/bf5bc0266a8cd16be6b640409e64a6c6c2705049 patch