CVE-2026-55409 in filament
Summary
by MITRE • 06/23/2026
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.
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Analysis
by VulDB Data Team • 06/23/2026
The Filament framework represents a comprehensive collection of full-stack components designed to accelerate Laravel development workflows, providing developers with pre-built UI elements and administrative interfaces. This particular vulnerability affects versions ranging from 3.0.0 through 3.3.53, specifically targeting the RichEditor field component that handles rich text input capabilities within the framework's administrative panels. The flaw manifests when a RichEditor field is disabled within a form, creating a critical security oversight in the framework's data rendering pipeline.
The technical implementation of this vulnerability stems from improper HTML sanitization during the rendering process of disabled RichEditor fields. When developers disable a RichEditor field through form configuration, the system fails to sanitize the raw HTML content that was previously stored in the field's state. This sanitization gap occurs because the framework assumes that data integrity is maintained when fields are enabled, but fails to apply consistent security measures when fields are disabled. The vulnerability specifically impacts scenarios where form state data contains unescaped HTML or JavaScript content, particularly when this data originates from user inputs or external sources that weren't properly sanitized during initial data entry.
The operational impact of this cross-site scripting vulnerability represents a significant risk to applications utilizing Filament's administrative interfaces. An attacker who can manipulate the data stored within a disabled RichEditor field can inject malicious HTML and JavaScript payloads that execute in the context of users viewing the form. This creates a persistent threat vector where legitimate administrators or users accessing forms containing compromised disabled RichEditor fields become potential victims of XSS attacks. The vulnerability is particularly concerning because it operates silently within the framework's normal operation, making detection difficult while allowing attackers to establish footholds for more sophisticated attacks including session hijacking, credential theft, and data exfiltration.
The security implications of this vulnerability align with CWE-79 which specifically addresses cross-site scripting flaws in web applications. Additionally, this weakness demonstrates characteristics consistent with ATT&CK technique T1203 which involves the use of web shell components to maintain persistence in compromised environments. The vulnerability exploits a fundamental security principle where input validation and output sanitization should occur consistently regardless of field states or form configurations. Organizations implementing Filament frameworks must understand that this issue affects not just individual applications but potentially entire ecosystems where administrators interact with forms containing vulnerable disabled RichEditor fields, making the attack surface broader than initially apparent.
Mitigation strategies for this vulnerability involve immediate deployment of version 3.3.53 which contains the necessary patch to properly sanitize HTML content regardless of field state. System administrators should conduct comprehensive audits of existing applications to identify any forms containing disabled RichEditor fields that might have been compromised, particularly those handling sensitive data or user inputs. The recommended remediation process includes applying the security update immediately followed by thorough testing to ensure no regressions in form functionality. Organizations should also implement additional monitoring for suspicious form data patterns and consider implementing content security policies as defense-in-depth measures. Regular security assessments of framework components and third-party libraries remain essential practices to identify similar vulnerabilities that may exist in other parts of the application stack beyond this specific RichEditor field implementation.