Insufficient verification of data authenticity in Roundcube Webmail - #VU162684
Published: November 9, 2026
Vulnerability identifier: #VU162684
CSH Severity: Low
CVSS v4: 5.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N]
CVE-ID: N/A
CWE-ID: CWE-345
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote user to introduce untrusted host or IP address information into a message's Received: header.
The vulnerability exists due to insufficient verification of hostname and forwarded IP information in Roundcube Webmail's Received: header generation when constructing mail headers. A remote user can supply untrusted hostname or forwarded IP information to misrepresent the message's recorded origin.
Affected software
Roundcube Webmail
Remediation
Install security update from vendor's website.
Roundcube Webmail - addressed in versions 1.6.21, 1.7.6