Simple Ajax Chat permits unauthenticated stored cross-site scripting
Simple Ajax Chat before 20260827 renders chat messages without adequate escaping. An unauthenticated visitor can inject HTML attributes and script that executes in the browser of anyone viewing the chat, including an administrator.
- Component
- Simple Ajax Chat
- Plugin slug
simple-ajax-chat- Affected
- < 20260827
- Safe version
20260827- Published
- Sep 02, 2026
This CVE was published Sep 02, 2026 and is one of 9 known issues for this plugin.
Update, patch or deactivate.
Update to Simple Ajax Chat 20260827 or later, remove malicious chat messages, and invalidate privileged sessions if administrators viewed affected chat content.
A safe version is available, so updating to that version or later is the preferred remediation. If an immediate update is not practical, consider a targeted application patch or temporarily restricting the affected functionality.
Deactivate only when warranted by your risk profile, or when advised by your hosting provider in the limited circumstances where the vulnerability cannot otherwise be mitigated. If you’re unsure which action is appropriate, contact Fused or your hosting provider for guidance.
Technical description
The Simple Ajax Chat WordPress plugin before 20260827 does not escape chat message content before rendering it, allowing unauthenticated users to inject arbitrary HTML attributes into the page and run scripts in the browser of anyone viewing the chat, including administrators.
CVE / CNA vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H