CVE-2026-113386
High
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.
SeverityHigh
CVSS7.1
Exploit probability—
Product
Webmail
PublishedOct 20, 2026
First seenOct 20, 2026
Weakness typeCWE-93CWE-93
How to fix
Update
- Roundcube Webmail1.6.20, 1.7.5 or later
Patches
- github.com/roundcube/roundcubemail/commit/004adaaeca4f6799715a54d12e3f657f19efcc9a
- github.com/roundcube/roundcubemail/releases/tag/1.7.5
- github.com/roundcube/roundcubemail/releases/tag/1.6.20
- github.com/roundcube/roundcubemail/commit/f62879defc0330ae240c72b83b2d00a8ab337447
- github.com/roundcube/roundcubemail/commit/bf5bc0266a8cd16be6b640409e64a6c6c2705049
Vendor advisories
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Roundcube Webmail | 1.6.0 ≤ v < 1.6.20, 1.7.0 ≤ v < 1.7.5 | 1.6.20, 1.7.5 |
Check your version
Choose the product and enter the version you run to see whether it falls in the affected range.
In the Intelligence 360 plan
Attack Surface Management
See the assets tied to your domains, the technologies they run and known vulnerabilities in one list.