CVE-2026-81825 Simple Ajax Chat <= 20260811 - Unauthenticated Stored Cross-Site Scripting
Unauthenticated attackers can inject persistent scripts via chat messages, leading to code execution or account takeover for all site visitors.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-81825?
CVE-2026-81825 is a high-severity cross-site scripting vulnerability in specialk Simple Ajax Chat – Add a Fast, Secure Chat Box, published on 11 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Weakness: CWE-79
Which versions are affected by CVE-2026-81825?
How do I fix CVE-2026-81825?
No fix has been published for CVE-2026-81825 yet. Limit exposure of the affected software until one is available.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2026-81825 being exploited?
There is no known exploitation of CVE-2026-81825 in the wild and no public exploit code.
Sources
Also known as GHSA-46jr-j7fv-fwm3.