CVE-2026-81754 Vigilant <= 2.10.2 - Unauthenticated Stored Cross-Site Scripting
Unauthenticated attackers can inject arbitrary scripts via User-Agent headers in the Vigilant WordPress plugin, leading to stored XSS execution.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-81754?
CVE-2026-81754 is a high-severity cross-site scripting vulnerability in fernandot Vigilant – 100% Free Security Suite: Firewall, 2FA, Login, Headers, Scanner…, published on 11 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
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.
Weakness: CWE-79
Which versions are affected by CVE-2026-81754?
How do I fix CVE-2026-81754?
No fix has been published for CVE-2026-81754 yet. Limit exposure of the affected software until one is available.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2026-81754 being exploited?
There is no known exploitation of CVE-2026-81754 in the wild and no public exploit code.
Sources
Also known as GHSA-9f7m-65q5-q8hw.