Cross-site scripting in Roundcube Webmail - #VU147187
Published: September 6, 2026
Vulnerability identifier: #VU147187
CSH Severity: Medium
CVSS v4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N]
CVE-ID: N/A
CWE-ID: CWE-79
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to execute arbitrary script.
The vulnerability exists due to improper neutralization of input during web page generation in attachment URL handling when processing TNEF MIME tag input. A remote attacker can send an email containing a crafted TNEF MIME tag to execute arbitrary script.
No user interaction is required.
Affected software
Roundcube Webmail
Remediation
Install security update from vendor's website.
Roundcube Webmail - addressed in versions 1.6.19, 1.7.4