CVE-2026-54433 in Roundcube Webmail
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...
Quick answer
Roundcube Webmail should be reviewed and updated if it matches the affected versions. The recommended fix is to apply the vendor-supported patched version or the mitigation steps below, then retest the public website with Fixnx.
Who is affected
Affected versions
- Roundcube Webmail 1.6.0 to before 1.6.17
- Roundcube Webmail 1.7.0 to before 1.7.2
Fixed versions
- Roundcube Webmail 1.6.17 or 1.7.2
How to fix it
Update Roundcube Webmail. The old webmail version can run script from a crafted email message.
- Upgrade Roundcube to Roundcube Webmail 1.6.17 or 1.7.2.
- Restart the webmail service.
- Clear web cache if used.
- Ask users to avoid opening suspicious messages until patched.
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Verify the fix
- Confirm Roundcube shows the fixed version.
- Scan again and confirm CVE-2026-54433 is gone.
Related categories
Trusted references
FAQ
What is affected by CVE-2026-54433?
Roundcube Webmail versions listed as affected should be reviewed: Roundcube Webmail 1.6.0 to before 1.6.17, Roundcube Webmail 1.7.0 to before 1.7.2.
What should I fix first?
Start with internet-facing sites, admin panels, login flows, plugins, themes, modules, packages, and systems that process user-controlled input or sensitive data.
How do I confirm the fix worked?
Apply the patched version or mitigation, clear caches where relevant, retest the affected workflow, and run a new Fixnx scan to verify public website exposure signals.
How are Fixnx security risk categories chosen?
Fixnx keeps one canonical risk page and assigns only broad, relevant categories such as ecosystem, technology area, or vulnerability class.