CRLF injection in Roundcube Webmail - #VU156154
Published: October 19, 2026
Vulnerability identifier: #VU156154
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-93
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote user to inject mail headers through inline image content.
The vulnerability exists due to improper neutralization of header delimiters in inline image processing when incorporating the media type from a data URI into mail headers. A remote user can supply an inline image data URI with a crafted media type to introduce additional mail headers or alter header interpretation.
Affected software
Roundcube Webmail
Remediation
Install security update from vendor's website.
Roundcube Webmail - addressed in versions 1.6.20, 1.7.5