CVE-2026-81825
Received Received - Intake

Stored XSS in Simple Ajax Chat WordPress Plugin

Publication date: 2026-09-11

Last updated on: 2026-09-11

Assigner: Wordfence

Description
The Simple Ajax Chat – Add a Fast, Secure Chat Box plugin for WordPress is vulnerable to Stored Cross-Site Scripting via Chat Message in all versions up to, and including, <= 20260811 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 nonce protecting chat message submission is publicly visible on the chat page, rendering it ineffective as an authentication barrier and allowing fully unauthenticated attackers to submit malicious messages that are stored persistently and rendered to all visitors on every page load.

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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-2026-81825
EUVD
EUVD-2026-75930

Affected Vendors & Products

Showing 2 associated CPEs
Vendor Product Version / Range
simple_ajax_chat fast_secure_chat_box to 20260811 (inc)
simple_ajax_chat plugin to 20260811 (inc)

Helpful Resources

Exploitability

CWE
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KEV
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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.

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Executive Summary

This is a Stored Cross-Site Scripting (XSS) vulnerability in the Simple Ajax Chat WordPress plugin. It allows unauthenticated attackers to inject malicious scripts via chat messages due to poor input sanitization and output escaping. The injected scripts execute when users view affected pages. The plugin's nonce for message submission is publicly visible, making it ineffective and allowing persistent malicious messages to be stored and displayed to all visitors.

Detection Guidance

This vulnerability involves stored XSS via chat messages in the Simple Ajax Chat WordPress plugin. To detect it, inspect WordPress sites using this plugin for unauthorized scripts in chat messages. Check server logs for unusual POST requests to /wp-admin/admin-ajax.php with chat message parameters. Use tools like WPScan to scan for vulnerable plugin versions.

Impact Analysis

Unauthenticated attackers could inject malicious scripts into chat messages that execute when users visit your site. This could lead to theft of user sessions, defacement of pages, or redirection to malicious sites. Visitors' browsers could be compromised, and sensitive data like cookies or credentials might be exposed.

Compliance Impact

This vulnerability could lead to unauthorized access to user data, violating GDPR's data protection principles and HIPAA's security requirements for protected health information. It may result in data breaches, non-compliance fines, and reputational damage due to insufficient protection against XSS attacks.

Mitigation Strategies

Immediately update the Simple Ajax Chat plugin to the latest version if available. If no update exists, disable or remove the plugin until a patch is released. Review chat logs for suspicious messages and remove any injected scripts. Implement a web application firewall to block XSS attempts.

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