XSS in Roundcube Webmail
CVE-2026-54433
In Roundcube Webmail before 1.6.17 and 1.7.x before 1.7.2, there is Stored Cross-Site Scripting (XSS) via a crafted plain-text email message. The attacker-controlled JavaScript executes within the victim's authenticated session simply by opening or previewing the message (zero-click).
Vulnerability class: XSS (Cross-Site Scripting)
EPSS: 0.003 (23.4th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 7.2 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N.
Affected products
- Roundcube Webmail — versions 1.6.0, 1.7.0
Weakness classification (CWE)
Public proof-of-concept exploits
References
- cve@mitre.org (Vendor Advisory)
Frequently asked questions
- What is CVE-2026-54433?
- CVE-2026-54433 is a high-severity vulnerability in Roundcube Webmail, classified under Cross-site Scripting. CVSS score: 7.2/10. Published 2026-07-14.
- How severe is CVE-2026-54433?
- High severity. CVSS v3 base score is 7.2 out of 10.
- Is CVE-2026-54433 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.