CVE-2026-66636 WordPress Wise Chat plugin <= 3.4.3 - Cross Site Scripting (XSS) vulnerability
Stored XSS in Wise Chat plugin allows attackers to inject malicious scripts, potentially leading to session hijacking or code execution.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-66636?
CVE-2026-66636 is a medium-severity cross-site scripting vulnerability in Marcin Wise Chat, published on 18 Aug 2026. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Official description
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in Marcin Wise Chat wise-chat allows Stored XSS.This issue affects Wise Chat: from n/a through 3.4.3.
Weakness: CWE-79
Which versions are affected by CVE-2026-66636?
How do I fix CVE-2026-66636?
No fix has been published for CVE-2026-66636 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-2026-66636 being exploited?
There is no known exploitation of CVE-2026-66636 in the wild and no public exploit code.
Sources
Also known as GHSA-hxx2-grcw-j9mq.