Cross-site scripting in Roundcube Webmail - CVE-2026-54432

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Main Vulnerability Database Vulnerabilities #VU136903

Cross-site scripting in Roundcube Webmail - CVE-2026-54432

Published: July 5, 2026


Vulnerability identifier: #VU136903
CSH Severity: Medium
CVSS v4: 4.8 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N]
CVE-ID: CVE-2026-54432
CWE-ID: CWE-79
Exploitation vector: Remote access
Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a remote user to execute arbitrary script code in a user's browser.

The vulnerability exists due to cross-site scripting in the attachment-validation warning page when rendering an unescaped attachment mime type. A remote user can store a crafted attachment mime type to execute arbitrary script code in a user's browser.


Affected software

Roundcube Webmail
Fedora
roundcubemail

How to mitigate CVE-2026-54432

Install security update from vendor's website.

Roundcube Webmail - addressed in versions 1.6.17, 1.7.2
roundcubemail - addressed in versions 1.6.17-1.el10_2, 1.6.17-1.el10_3, 1.6.17-1.fc43, 1.7.2-1.fc44

External References

Related Security Bulletins