CVE-2026-55409 Filament: Disabled RichEditor field state can be used for XSS
Attackers can inject malicious scripts into disabled RichEditor fields, leading to XSS execution for users viewing the form.
- 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
- Available
What is CVE-2026-55409?
CVE-2026-55409 is a high-severity cross-site scripting vulnerability in filamentphp filament, published on 22 Jun 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
Filament is a collection of full-stack components for accelerated Laravel development. From 3.0.0 until 3.3.53, a disabled RichEditor field rendered its raw state without sanitizing HTML. Where the data stored in this field's state isn't sanitized already when the form state was filled, an attacker could plant malicious HTML or JavaScript and achieve XSS that executes for users who view the form. This vulnerability is fixed in 3.3.53.
Weakness: CWE-79
Which versions are affected by CVE-2026-55409?
2 open source packages ship an affected version, including filament/forms.
| Package | Affected | Fixed in |
|---|---|---|
filament/forms Packagist | From 3.0.0 | 3.3.53 |
filament/forms Packagist | From 3.0.0 | 3.3.53 |
How do I fix CVE-2026-55409?
Upgrade filament/forms to 3.3.53 or later.
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-2026-55409 being exploited?
There is no known exploitation of CVE-2026-55409 in the wild and no public exploit code.
Sources
Also known as GHSA-m9cv-24rx-8mv7.