CVE-2026-126813
Roundcube Webmail before 1.6.21 and 1.7.6 IMAP Command Injection via _uid
CVSS Score
6.8
EPSS Score
0.0%
EPSS Percentile
0th
Roundcube Webmail before 1.6.21 and 1.7.x before 1.7.6 contains an IMAP command injection vulnerability that allows attackers to inject commands via CRLF in the _uid parameter when messages_cache is enabled. Attackers can lure logged-in victims into opening crafted GET links to mail/show or mail/get, executing IMAP commands that delete messages, change flags, or grant mailbox access via SETACL.
| CWE | CWE-93 |
| Vendor | roundcube |
| Product | webmail |
| Published | Nov 11, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
None
Affected Versions
Roundcube / Webmail
0 < 1.6.21 1.7.0 < 1.7.6
References
github.com: https://github.com/roundcube/roundcubemail/commit/4cb1cf106b9ca5d465ed4924f2fab5d5108edfeb github.com: https://github.com/roundcube/roundcubemail/commit/d1dda13597ceed9df49d434a8d88b758bcf6ef5c github.com: https://github.com/roundcube/roundcubemail/commit/2ea63692178cab5cea486c7c630901b7f6852c80 github.com: https://github.com/roundcube/roundcubemail/blob/1.7.5/program/lib/Roundcube/rcube_imap_generic.php#L2892 roundcube.net: https://roundcube.net/news/2026/11/09/security-updates-1.6.21-and-1.7.6 github.com: https://github.com/roundcube/roundcubemail/releases/tag/1.6.21 github.com: https://github.com/roundcube/roundcubemail/releases/tag/1.7.6 vulncheck.com: https://www.vulncheck.com/advisories/roundcube-webmail-before-1.6.21-and-1.7.6-imap-command-injection-via-uid
Credits
Dexx-tech