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...
- Published
- Jul 14, 2026
- Updated
- Jul 15, 2026
- Assigning CNA
- mitre
- Evidence observed
- Aug 14, 2026
Primary CVSS
nvd · CVSS 3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:NLow · next 30 days
- Percentile
- 24.2%
- Model date
- Sep 21, 2026
EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.
Summary
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).
Sources
1- CVE-2026-54433Exploit
Configurable Python PoC for CVE-2026-54433, a stored XSS in Roundcube's plain-text email renderer. Generates crafted .eml, sends via SMTP, and validates impact in a Docker lab.
Responsible use
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