CVE-2026-81754
Received Received - Intake

Stored XSS in Vigilant Security Suite WordPress Plugin

Publication date: 2026-09-11

Last updated on: 2026-09-11

Assigner: Wordfence

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 Scores

EPSS Scores

Probability:
Percentile:

Meta Information

Published
2026-09-11
Last Modified
2026-09-11
Generated
2026-09-11
AI Q&A
2026-09-11
EPSS Evaluated
N/A
NVD
CVE-2026-81754
EUVD
EUVD-2026-75935

Affected Vendors & Products

Showing 2 associated CPEs
Vendor Product Version / Range
wordfence vigilant_security_suite to 2.10.2 (inc)
wpvigilant the_vigilant to 2.10.2 (inc)

Helpful Resources

Exploitability

CWE
CWE Icon
KEV
KEV Icon
CWE ID Description
CWE-79 The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.

Attack-Flow Graph

AI Quick Actions

Instant insights powered by AI
Executive Summary

This is a Stored Cross-Site Scripting (XSS) vulnerability in the Vigilant Security Suite WordPress plugin. It allows unauthenticated attackers to inject malicious scripts via the User-Agent header during failed login attempts. The payload executes when users access infected pages, requiring no further attacker interaction.

Detection Guidance

Check WordPress plugin logs for failed login attempts with unusual User-Agent headers. Inspect stored User-Agent values in the database for suspicious scripts. Use security plugins to scan for stored XSS payloads in page content.

Impact Analysis

Attackers could steal user sessions, redirect to malicious sites, or perform actions on behalf of users. Users visiting compromised pages may have their data exposed or accounts hijacked without realizing it.

Compliance Impact

This vulnerability could lead to unauthorized data access or modification, violating GDPR's integrity and confidentiality requirements or HIPAA's safeguards for protected health information. Organizations may face compliance penalties if user data is compromised.

Mitigation Strategies

Update the Vigilant Security Suite plugin to the latest version. Implement a web application firewall to block malicious User-Agent headers. Review and sanitize User-Agent inputs in login attempts.

Chat Assistant

Ask questions about this CVE
Hi! I’m here to help you understand CVE-2026-81754. Ask me anything about the vulnerability, its impact, or mitigation strategies.
0/70

EPSS Chart