CVE-2026-18409 Cross-site scripting in WPForms Pro
Unauthenticated attackers can inject arbitrary scripts via form fields, leading to code execution or account takeover when users view entries.
- 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-2026-18409?
CVE-2026-18409 is a high-severity cross-site scripting vulnerability in WPForms Pro, published on 21 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
The WPForms Pro plugin for WordPress is vulnerable to Stored Cross-Site Scripting via Single Line Text and Paragraph Text Field Values in all versions up to, and including, 2.0.0.2 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 exploit relies on the plugin's own wp_kses_allowed_html filter widening the 'post' allowlist to permit iframe elements with a data-src attribute, which is not on WordPress's URI-attribute sanitization list, allowing a javascript: URI stored in data-src to survive kses processing and subsequently be promoted to a live src attribute by the bundled admin script view-entry.min.js.
Weakness: CWE-79
Which versions are affected by CVE-2026-18409?
How do I fix CVE-2026-18409?
No fix has been published for CVE-2026-18409 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-2026-18409 being exploited?
There is no known exploitation of CVE-2026-18409 in the wild and no public exploit code.
Sources
Also known as GHSA-6mv8-cgfh-7rch.