CVE-2026-18404 Cross-site scripting in Social Chat – Click To Chat App Button
Authenticated contributors can inject malicious scripts via the consent_message attribute, leading to code execution on page load for other users.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-18404?
CVE-2026-18404 is a medium-severity cross-site scripting vulnerability in quadlayers Social Chat – Click To Chat App Button, published on 5 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
The Social Chat – Click To Chat App Button plugin for WordPress is vulnerable to Stored Cross-Site Scripting via 'consent_message' JSON Attribute in .qlwapp data-box in all versions up to, and including, 8.6.2 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with contributor-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. The exploit requires no user interaction beyond page load, as setting auto_open and consent_enabled to 'yes' in the injected data-box JSON causes the consent box — and the embedded script — to execute immediately on page load.
Weakness: CWE-79
Which versions are affected by CVE-2026-18404?
How do I fix CVE-2026-18404?
No fix has been published for CVE-2026-18404 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-2026-18404 being exploited?
There is no known exploitation of CVE-2026-18404 in the wild and no public exploit code.
Sources
Also known as GHSA-3j54-vf3c-f8mg.