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Vulnerability · Published Sep 11, 2026 · Assigned by Wordfence

CVE-2026-81754Vigilant <= 2.10.2 - Unauthenticated Stored Cross-Site Scripting

High 7.2

In plain English

A high-severity cross-site scripting in Vigilant – 100% Free Security Suite: Firewall, 2FA, Login, Headers, Scanner… from fernandot. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 36% of all known vulnerabilities).

Severity (CVSS 3.1)7.2High
Exploit odds (30 days)0.4%top 63.6% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official 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.

Affected products (as reported)

VendorProductVersions
fernandot Vigilant – 100% Free Security Suite: Firewall, 2FA, Login, Headers, Scanner… 0 – through 2.10.2

Weakness: CWE-79 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N

References