CVE-2026-121977 JetFormBuilder <= 3.6.8 - Unauthenticated Stored Cross-Site Scripting via Dynamic Value Block `to_set` Property
- Exploited in the wild
- Not known
- Fix
- None listed
What is CVE-2026-121977?
CVE-2026-121977 is a medium-severity vulnerability in jetmonsters JetFormBuilder — Dynamic Blocks Form Builder, published on 7 Nov 2026.
Official description
The JetFormBuilder — Dynamic Blocks Form Builder plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'note (form field whose value is written to post meta `note`)' parameter in all versions up to, and including, 3.6.8 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. Successful exploitation requires a privileged user with the edit_others_posts capability to visit a form URL containing the attacker-created post ID, a delivery step the attacker controls via a crafted phishing link.
Weakness: CWE-79
Which versions are affected by CVE-2026-121977?
How do I fix CVE-2026-121977?
No fix has been published for CVE-2026-121977 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-121977 being exploited?
There is no known exploitation of CVE-2026-121977 in the wild and no public exploit code.
Sources
Also known as GHSA-3cp8-88h9-2m3w.