---
title: "CVE-2026-113386: Roundcube Webmail - Command Injection"
description: "Roundcube Webmail < 1.6.20 and 1.7.x < 1.7.5 contain an IMAP command injection caused by CRLF sequences injected into the _uid parameter in mail/headers and mail/viewsource actions, letting remote authenticated attackers execute arbitrary IMAP commands."
url: https://panop.io/threat-heartbeat/CVE-2026-113386/
---

# CVE-2026-113386 Roundcube Webmail - Command Injection

Roundcube Webmail < 1.6.20 and 1.7.x < 1.7.5 contain an IMAP command injection caused by CRLF sequences injected into the \_uid parameter in mail/headers and mail/viewsource actions, letting remote authenticated attackers execute arbitrary IMAP commands.

CVSS base score 7.1 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Required

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-113386)

## Details

Type

Command Injection

Impact

Remote Code Execution

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:N

Published

20 October 2026

Updated

20 October 2026

Weakness

[CWE-93](https://cwe.mitre.org/data/definitions/93.html)

## Vendor fix

Update to version 1.6.20 or 1.7.5 or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-113386](https://nvd.nist.gov/vuln/detail/CVE-2026-113386)
- [https://github.com/roundcube/roundcubemail/commit/004adaaeca4f6799715a54d12e3f657f19efcc9a](https://github.com/roundcube/roundcubemail/commit/004adaaeca4f6799715a54d12e3f657f19efcc9a)
- [https://github.com/roundcube/roundcubemail/commit/bf5bc0266a8cd16be6b640409e64a6c6c2705049](https://github.com/roundcube/roundcubemail/commit/bf5bc0266a8cd16be6b640409e64a6c6c2705049)
- [https://github.com/roundcube/roundcubemail/commit/f62879defc0330ae240c72b83b2d00a8ab337447](https://github.com/roundcube/roundcubemail/commit/f62879defc0330ae240c72b83b2d00a8ab337447)
- [https://github.com/roundcube/roundcubemail/releases/tag/1.6.20](https://github.com/roundcube/roundcubemail/releases/tag/1.6.20)
- [https://github.com/roundcube/roundcubemail/releases/tag/1.7.5](https://github.com/roundcube/roundcubemail/releases/tag/1.7.5)
- [https://roundcube.net/news/2026/10/19/security-updates-1.6.20-and-1.7.5](https://roundcube.net/news/2026/10/19/security-updates-1.6.20-and-1.7.5)
- [https://bugs.debian.org/1151279](https://bugs.debian.org/1151279)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

Panop answers these inside your environment, for this CVE and every other finding.

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