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Vulnerability record · CVE-2026-81754 · published 11 September 2026

CVE-2026-81754: Cross-site scripting vulnerability

The Vigilant – 100% Free Security Suite: Firewall, 2FA, Login, Headers, Scanner… plugin for WordPress is vulnerable to Stored Cross-Site Scripting via User-Agent Header in all versions up to, and including, 2.10.2 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. The malicious payload is delivered passively by any unauthenticated visitor who triggers a failed login attempt with a crafted User-Agent header, requiring no further interaction from the attacker once stored.

7.2 CVSS 3.1 High EPSS 0.42% · top 66.3% CWE-79 · Cross-site scripting Deferred
7.2CVSS 3.1 base score
0.42%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
7References
11 Sep 2026Last modified by NVD

Description

The Vigilant – 100% Free Security Suite: Firewall, 2FA, Login, Headers, Scanner… plugin for WordPress is vulnerable to Stored Cross-Site Scripting via User-Agent Header in all versions up to, and including, 2.10.2 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. The malicious payload is delivered passively by any unauthenticated visitor who triggers a failed login attempt with a crafted User-Agent header, requiring no further interaction from the attacker once stored.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N

References

LinkTags
https://plugins.trac.wordpress.org/browser/vigilante/tags/2.9.5/assets/js/admin.js#L1996
https://plugins.trac.wordpress.org/browser/vigilante/tags/2.9.5/assets/js/admin.js#L2778
https://plugins.trac.wordpress.org/browser/vigilante/tags/2.9.5/includes/class-database.php#L448
https://plugins.trac.wordpress.org/browser/vigilante/tags/2.9.5/includes/class-database.php#L639
https://plugins.trac.wordpress.org/browser/vigilante/tags/2.9.5/includes/class-login-security.php#L899
https://plugins.trac.wordpress.org/changeset?sfp_email=&sfph_mail=&reponame=&new=3669625%40vigilante%2Ftrunk%2Fassets%2F
https://www.wordfence.com/threat-intel/vulnerabilities/id/c483cdc5-56e4-4ee7-a782-0505816728ab?source=cve

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Source: NIST National Vulnerability Database (record CVE-2026-81754), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.