CVE-2026-19861 JetFormBuilder < 3.6.5.2 - Unauthenticated Stored XSS via WYSIWYG Field in Notification Emails
Unauthenticated attackers can inject arbitrary HTML into notification emails via WYSIWYG fields, potentially leading to script execution in recipient mail clients.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-19861?
CVE-2026-19861 is a medium-severity cross-site scripting vulnerability in Unknown JetFormBuilder — Dynamic Blocks Form Builder, published on 5 Sep 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
The JetFormBuilder — Dynamic Blocks Form Builder WordPress plugin before 3.6.5.2 does not properly sanitise and escape a form field's value before including it in the HTML notification emails it sends, allowing unauthenticated users to inject arbitrary HTML into messages delivered to administrators and other recipients. Whether injected script executes depends on the recipient's mail client, but the injected markup is rendered regardless.
Weakness: CWE-79
Which versions are affected by CVE-2026-19861?
How do I fix CVE-2026-19861?
No fix has been published for CVE-2026-19861 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-2026-19861 being exploited?
There is no known exploitation of CVE-2026-19861 in the wild and no public exploit code.
Sources
Also known as GHSA-j6wc-w47f-c97j.