High severity · published Oct 20, 2026
CVE-2026-113386
Roundcube Webmail before 1.6.20 and 1.7.x before 1.7.5 are affected by IMAP command injection
7.1
CVSS
1%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:N
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
Low
Integrity
High
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)1.0% · higher than 63% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
WE
Webmail · Roundcube
1.6.0 before 1.6.20; 1.7.0 before 1.7.5 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-113386
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-113386
bugs.debian.org
https://bugs.debian.org/1151279
github.com
https://github.com/roundcube/roundcubemail/commit/004adaaeca4f6799715a54d12e3f657f19efcc9a
github.com
https://github.com/roundcube/roundcubemail/commit/bf5bc0266a8cd16be6b640409e64a6c6c2705049
github.com
https://github.com/roundcube/roundcubemail/commit/f62879defc0330ae240c72b83b2d00a8ab337447
github.com
https://github.com/roundcube/roundcubemail/releases/tag/1.6.20
github.com
https://github.com/roundcube/roundcubemail/releases/tag/1.7.5
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