The Simple Ajax Chat plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'c' parameter in versions up to, and including, 20260217 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.
CVE-2026-2987 is a medium severity with CVSS 6.1 Stored Cross-Site Scripting issue affecting the Plugin Simple Ajax Chat – Add a Fast, Secure Chat Box. It affects Versions up to 20260217 and is fixed in 20260301.
CVE-2026-2987 is tracked for the Plugin Simple Ajax Chat – Add a Fast, Secure Chat Box as medium severity with CVSS 6.1. The affected range is Versions up to 20260217. Update Simple Ajax Chat – Add a Fast, Secure Chat Box to 20260301 or newer where that version is compatible with the site.
| Software Type | Plugin |
|---|---|
| Software Slug |
simple-ajax-chat
View on wordpress.org
|
| CVE | CVE-2026-2987 |
| Patched Versions |
20260301
|
| Affected Versions |
Versions up to 20260217
|
These internal links group the same WordPress plugin by CVE, issue type, severity, and patch status so operators and search engines can connect the full vulnerability cluster.
Simple Ajax Chat <= 20240216 - Unauthenticated Stored Cross-Site Scripting
Simple Ajax Chat <= 20220115 - Cross-Site Request Forgery
Simple Ajax Chat <= 20220115 - Unauthenticated Stored Cross-Site Scripting
Simple Ajax Chat <= 20251121 - Unauthenticated Information Exposure
Simple Ajax Chat Plugin <= 20220115 - Sensitive Information Disclosure
Simple Ajax Chat – Add a Fast, Secure Chat Box <= 20240318 - Authenticated (Admin+) Stored Cross-Site Scripting
Simple Ajax Chat <= 20231101 - Authenticated (Admin+) Stored Cross-Site Scripting
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