CVE-2026-114716 Roundcube Webmail - Injection

Roundcube Webmail < 1.6.20 and 1.7.x < 1.7.5 contain a mail header injection caused by improper validation of media type in inline image data URI in rcmail_sendmail::extract_inline_images(), letting remote authenticated attackers inject arbitrary MIME headers, exploit requires authentication.

CVSS base score 8.5 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Required
EPSS
0.39% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Injection
Impact
Data Tampering
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:H/A:N
Published
22 October 2026
Updated
23 October 2026
Weakness
CWE-99

Vendor fix

Update to version 1.6.20 or 1.7.5 or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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