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 products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Roundcube | Webmail | 1.6.0 – < 1.6.20, 1.7.0 – < 1.7.5 | 1.6.20 |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | roundcube | 1.6.20+dfsg-1 | — |
| Debian 13 | roundcube | 1.6.20+dfsg-0+deb13u1 | — |
| Debian 12 | roundcube | No fix yet | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.10 | roundcube | No fix yet | — |
Show 6 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 26.04 LTS | roundcube | No fix yet | — |
| Ubuntu Pro 24.04 LTS | roundcube | No fix yet | — |
| Ubuntu Pro 22.04 LTS | roundcube | No fix yet | — |
| Ubuntu Pro 20.04 LTS | roundcube | No fix yet | — |
| Ubuntu Pro 18.04 LTS | roundcube | No fix yet | — |
| Ubuntu Pro 16.04 LTS | roundcube | No fix yet | — |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | roundcubemail | 1.6.20-1.1 | openSUSE-SU-2026:12221-1 |
| openSUSE Leap 16.0 | roundcubemail | 1.6.20-bp160.1.1 | openSUSE-SU-2026:22195-1 |
Public exploits
Exploit or proof-of-concept code for this vulnerability is publicly available, which lowers the bar for attackers. Treat it as a reason to patch sooner.
GitHub 1 repository
-
Neo-XeD/CVE-2026-113386 ★ 0 · Nov 8, 2026
IMAP Command Injection via CRLF in the `_uid` Parameter
Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.
Advisories 3
- WID-SEC-2026-4043 Roundcube Webmail: Mehrere Schwachstellen BSI CERT-Bund (WID) · Nov 5, 2026
- openSUSE-SU-2026:22195-1 Security update for roundcubemail SUSE / openSUSE Security Updates · Nov 1, 2026
- openSUSE-SU-2026:12221-1 roundcubemail-1.6.20-1.1 on GA media SUSE / openSUSE Security Updates · Oct 22, 2026
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