Simple Ajax Chat – Add a Fast, Secure Chat Box < 20260827 - Unauthenticated Stored Cross-Site Scripting
Strategic Overview
- Status
- Patched in 20260827
- Affected Plugin
- Simple Ajax Chat – Add a Fast, Secure Chat Box
- Affected Version
< 20260827- CVSS
- 7.2High
- Weakness type
- CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
- CVE
CVE-2026-81807
At a glance
CVE-2026-81807 is a high-severity Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in the Simple Ajax Chat WordPress plugin, affecting versions < 20260827. It carries a CVSS score of 7.2 (reachable over the network; low attack complexity). Exploitation requires no authentication. The issue is fixed in version 20260827; sites on affected versions should update now. Disclosed September 2026, reported by Erwan LR.
Vulnerability Overview
The Simple Ajax Chat – Add a Fast, Secure Chat Box plugin for WordPress is vulnerable to Stored Cross-Site Scripting in all versions up to 20260827. This is 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.
Technical Analysis
The vector marks this flaw as remotely reachable over the network, with low attack complexity — no special timing or configuration is needed, and no privileges on the target site, and no interaction from a victim user.
CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Reaching this weakness in Simple Ajax Chat < 20260827 takes no account at all. Cross-site scripting happens when input from a request is written into a page without being escaped for the context it lands in, so the browser parses attacker-supplied text as markup or script.
Injected script runs with the privileges of whoever views the affected page, which is how these flaws turn into administrator session theft, silent account creation or persistent backdoors in page content. For Simple Ajax Chat the fix is 20260827: builds < 20260827 are affected, anything from 20260827 onward is not.
Remediation
Update to version 20260827, or a newer patched version
How does WordSec protect against this?
Requests carrying this pattern arrive without a session, so nothing upstream of the firewall gets a chance to reject them: WordSec's web application firewall inspects request payloads before WordPress loads them. None of that substitutes for the fix: Simple Ajax Chat 20260827 closes this, and updating the plugin is the step that ends it.
- Firewall
- Login Security
- Alerts
External References
Related records
Same weakness class
Other vulnerabilities in Simple Ajax Chat – Add a Fast, Secure Chat Box
- 5.4CVE-2022-27850: Simple Ajax Chat <= 20220115 CSRF
CVE-2022-27850 - 5.3CVE-2026-3075: Simple Ajax Chat <= 20251121 Information Exposure
CVE-2026-3075 - 5.3CVE-2022-27849: Simple Ajax Chat Plugin <= 20220115 Info Disclosure
CVE-2022-27849 - 4.4CVE-2024-2956: Simple Ajax Chat <= 20231101 Stored XSS
CVE-2024-2956
Vulnerability data © Defiant, Inc., provided under the Wordfence Intelligence T&C