Roundcube Webmail before 1.6.21 and 1.7.6 IMAP Command Injection via _uid
Summary
| CVE | CVE-2026-126813 |
|---|---|
| State | PUBLISHED |
| Assigner | VulnCheck |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2026-11-11 21:16:45 UTC |
| Updated | 2026-11-12 20:28:31 UTC |
| 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. |
Risk And Classification
Primary CVSS: v4.0 7.4 HIGH from [email protected]
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
EPSS: 0.010600000 probability, percentile 0.650260000 (date 2026-11-12)
Problem Types: CWE-93 | CWE-93 Improper Neutralization of CRLF Sequences ('CRLF Injection')
| Version | Source | Type | Score | Severity | Vector |
|---|---|---|---|---|---|
| 4.0 | [email protected] | Secondary | 7.4 | HIGH | CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/C... |
| 4.0 | CNA | CVSS | 7.4 | HIGH | CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N |
| 3.1 | [email protected] | Primary | 6.8 | MEDIUM | CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N |
| 3.1 | CNA | CVSS | 6.8 | MEDIUM | CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N |
CVSS v4.0 Breakdown
Attack Vector
NetworkAttack Complexity
LowAttack Requirements
PresentPrivileges Required
NoneUser Interaction
ActiveConfidentiality
HighIntegrity
HighAvailability
NoneSub Conf.
NoneSub Integrity
NoneSub Availability
NoneCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
CVSS v3.1 Breakdown
Attack Vector
NetworkAttack Complexity
HighPrivileges Required
NoneUser Interaction
RequiredScope
UnchangedConfidentiality
HighIntegrity
HighAvailability
NoneCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N
Vendor Declared Affected Products
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| www.vulncheck.com/advisories/roundcube-webmail-before-1.6.21-and-1.7.6-imap-com... | [email protected] | www.vulncheck.com | |
| roundcube.net/news/2026/11/09/security-updates-1.6.21-and-1.7.6 | [email protected] | roundcube.net | |
| github.com/roundcube/roundcubemail/commit/4cb1cf106b9ca5d465ed4924f2fab5... | [email protected] | github.com | |
| github.com/roundcube/roundcubemail/commit/2ea63692178cab5cea486c7c630901... | [email protected] | github.com | |
| github.com/roundcube/roundcubemail/releases/tag/1.7.6 | [email protected] | github.com | |
| github.com/roundcube/roundcubemail/commit/d1dda13597ceed9df49d434a8d88b7... | [email protected] | github.com | |
| github.com/roundcube/roundcubemail/releases/tag/1.6.21 | [email protected] | github.com | |
| github.com/roundcube/roundcubemail/blob/1.7.5/program/lib/Roundcube/rcub... | [email protected] | github.com | |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
Vendor Comments And Credit
Discovery Credit
CNA: Dexx-tech (en)
There are currently no legacy QID mappings associated with this CVE.