Anti-Malware Security and Brute-Force Firewall <= 4.23.89 - Unauthenticated Stored Cross-Site Scripting
Anti-Malware Security and Brute-Force Firewall has a cross-site scripting issue. Unsafe script can run in another user's browser if the vulnerable feature is used.
Quick answer
Anti-Malware Security and Brute-Force Firewall 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
- Anti-Malware Security and Brute-Force Firewall up to and including 4.23.89
Fixed versions
- Anti-Malware Security and Brute-Force Firewall 4.23.90 or later
How to fix it
Update Anti-Malware Security and Brute-Force Firewall. The old version can let unsafe script run in a user or admin browser.
- Back up the site and database.
- Update Anti-Malware Security and Brute-Force Firewall to Anti-Malware Security and Brute-Force Firewall 4.23.90 or later.
- Clear all site and plugin caches.
- Review recent posts, settings, forms, and widgets for unknown script.
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Verify the fix
- Confirm the installed version is Anti-Malware Security and Brute-Force Firewall 4.23.90 or later.
- Test the affected feature and confirm script input is blocked or cleaned.
Related categories
Trusted references
FAQ
What is affected by CVE-2026-57691?
Anti-Malware Security and Brute-Force Firewall versions listed as affected should be reviewed: Anti-Malware Security and Brute-Force Firewall up to and including 4.23.89.
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.