What is CVE-2026-54432?

CVE-2026-54432 is a medium-severity vulnerability in Roundcube Webmail, classified under Cross-site Scripting. CVSS score: 4.7/10. Published 2026-07-14.

How severe is CVE-2026-54432?

Medium severity. CVSS v3 base score is 4.7 out of 10.

XSS in Roundcube Webmail

CVE-2026-54432

Roundcube Webmail before 1.6.17 and 1.7.x before 1.7.2 allows Stored Cross-Site Scripting (XSS). The issue occurs because the attachment MIME type is not properly escaped on the attachment-validation warning page.

Vulnerability class: XSS (Cross-Site Scripting)

CVSS v3 metric

CVSS v3 base score 4.7 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:N.

Affected products

Roundcube Webmail — versions 1.6.0, 1.7.0

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

cve@mitre.org

Frequently asked questions

What is CVE-2026-54432?: CVE-2026-54432 is a medium-severity vulnerability in Roundcube Webmail, classified under Cross-site Scripting. CVSS score: 4.7/10. Published 2026-07-14.
How severe is CVE-2026-54432?: Medium severity. CVSS v3 base score is 4.7 out of 10.