CVE-2026-77567 in Filament
Summary
by MITRE • 08/25/2026
Filament is a collection of full-stack components for accelerated Laravel development. Prior to versions 4.12.0 and 5.7.0, incorrect challenge-form required-field handling allows app-based multi-factor authentication to be bypassed when recovery codes are enabled. Email-based multi-factor authentication is not affected. This issue is fixed in versions 4.12.0 and 5.7.0.
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Analysis
by VulDB Data Team • 08/25/2026
The vulnerability identified within the Filament framework, specifically affecting versions prior to 4.12.0 for the v4 branch and prior to 5.7.0 for the v5 branch, represents a critical authentication bypass flaw rooted in improper validation logic during multi-factor authentication workflows. Filament serves as a comprehensive suite of full-stack components designed to accelerate development within the Laravel ecosystem, providing developers with pre-built UI elements and backend utilities. However, this particular security defect emerges when applications utilizing these components implement app-based multi-factor authentication mechanisms that also support recovery codes for account access in scenarios where primary authenticator devices are unavailable. The core technical flaw lies in how the framework handles required fields within challenge forms during the verification process. Specifically, the validation logic fails to strictly enforce the presence and validity of necessary input parameters when processing requests associated with recovery code usage or specific authentication states. This lapse allows an attacker to manipulate the request structure to bypass the mandatory multi-factor step entirely, effectively treating a single-factor login as if it had passed full two-step verification.
From a technical perspective, this issue is classified under CWE-287, which denotes Improper Authentication, and more specifically aligns with CWE-306 regarding Missing Authentication for Critical Function. The operational impact of this vulnerability is severe because it undermines the fundamental security guarantee provided by multi-factor authentication systems. By bypassing the second factor, an attacker who has obtained or guessed a user's primary password can gain unauthorized access to the application without needing possession of the authenticator device or valid recovery codes. This effectively reduces the strength of the account protection from two factors down to one, exposing sensitive data and functionality to compromise if credentials are leaked through phishing, credential stuffing, or other means. It is important to note that this vulnerability does not affect email-based multi-factor authentication implementations, indicating that the flaw is isolated to specific code paths handling app-based authenticators and their associated recovery mechanisms within the Filament component library.
The exploitation of this weakness relies on the attacker's ability to interact with the login or verification endpoints exposed by applications built using vulnerable versions of Filament. By crafting requests that omit or incorrectly format required fields during the challenge phase, an adversary can trick the application into accepting a successful authentication state without completing the full multi-factor process. This type of attack is consistent with techniques observed in MITRE ATT&CK framework under T1078, Valid Accounts, particularly when combined with credential theft tactics to establish persistent unauthorized access. The severity is further amplified by the widespread adoption of Laravel and Filament among developers who may not be deeply versed in low-level security validation nuances, potentially leading many production environments to remain exposed if they have not yet upgraded their dependencies.
To mitigate this vulnerability, organizations must immediately upgrade their Filament packages to version 4.12.0 or later for the v4 branch and version 5.7.0 or later for the v5 branch. These releases contain patches that correct the challenge-form required-field handling logic, ensuring that all necessary authentication steps are strictly enforced regardless of whether recovery codes are enabled in the application configuration. Developers should also audit their custom implementations to ensure they adhere to strict input validation practices and avoid relying solely on framework defaults without verifying security implications. Additionally, implementing defense-in-depth strategies such as rate limiting on login attempts, monitoring for anomalous authentication patterns indicative of bypass attempts, and ensuring that recovery codes are rotated regularly can provide additional layers of protection against credential-based attacks while the underlying software is updated.