CVE-2026-55409 is a high-severity cross-site scripting (XSS) vulnerability in filament/forms (composer), affecting versions >= 3.0.0, <= 3.3.52. It is fixed in 3.3.53.
In Filament v3, 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. Please note that Filament v4 and above does not use the same mechanism for rendering a disabled RichEditor so this advisory does not apply.
Untrusted input is rendered as active markup in a victim's browser, which can run script in their session. Typical impact: session or credential theft, and actions taken as the user.
CVE-2026-55409 has a CVSS score of 7.6 (High). The vector is network-reachable, low privileges required, and user interaction required. A CVSS score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether this affects your application depends on whether the vulnerable code is present and reachable in your environment.
A fixed version is available (3.3.53). Upgrading removes the vulnerable code path.
composer
filament/forms (>= 3.0.0, <= 3.3.52)filament/forms → 3.3.53 (composer)Severity tells you how bad this could be in the worst case. It does not tell you whether you are exposed. Exploitability and impact are functions of runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A vulnerable package can sit in your dependency tree and never run.
Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter instead of chasing every advisory.
Kodem's runtime-powered SCA identifies whether CVE-2026-55409 is reachable in your applications. Explore open-source security for your team.
See if CVE-2026-55409 is reachable in your applications. Get a demo
Upgrade filament/forms to 3.3.53 or later to resolve this vulnerability.
Kodem Kai can prioritize this vulnerability in your dependency tree and generate a fix recommendation.
CVE-2026-55409 is a high-severity cross-site scripting (XSS) vulnerability in filament/forms (composer), affecting versions >= 3.0.0, <= 3.3.52. It is fixed in 3.3.53. Untrusted input is rendered as active markup in a victim's browser, which can run script in their session.
CVE-2026-55409 has a CVSS score of 7.6 (High). This score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether it represents real risk in your environment depends on whether the vulnerable code is present and reachable.
filament/forms (composer) versions >= 3.0.0, <= 3.3.52 is affected.
Yes. CVE-2026-55409 is fixed in 3.3.53. Upgrade to this version or later.
Whether CVE-2026-55409 is exploitable in your environment depends on whether the vulnerable code is present and reachable. A CVSS score is a worst-case rating; it does not account for your specific deployment, configuration, or usage patterns. Kodem, an Intelligent Application Security platform, uses runtime intelligence to show which vulnerabilities actually execute in production, so you can focus on the ones that represent real risk. Get a demo
Exploitability and impact are not fixed properties of a CVE. They depend on runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A high CVSS score on a dependency that never runs is not the same as real risk. Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter.
Upgrade filament/forms to 3.3.53 or later.