Medium severity6.8NVD Advisory· Published Nov 11, 2026
CVE-2026-126813
CVE-2026-126813
Description
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.
Affected products
2- Range: <1.6.21, <1.7.6
Patches
Vulnerability mechanics
References
8- github.com/roundcube/roundcubemail/blob/1.7.5/program/lib/Roundcube/rcube_imap_generic.phpnvd
- github.com/roundcube/roundcubemail/commit/2ea63692178cab5cea486c7c630901b7f6852c80nvd
- github.com/roundcube/roundcubemail/commit/4cb1cf106b9ca5d465ed4924f2fab5d5108edfebnvd
- github.com/roundcube/roundcubemail/commit/d1dda13597ceed9df49d434a8d88b758bcf6ef5cnvd
- github.com/roundcube/roundcubemail/releases/tag/1.6.21nvd
- github.com/roundcube/roundcubemail/releases/tag/1.7.6nvd
- roundcube.net/news/2026/11/09/security-updates-1.6.21-and-1.7.6nvd
- www.vulncheck.com/advisories/roundcube-webmail-before-1.6.21-and-1.7.6-imap-command-injection-via-uidnvd
News mentions
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