CVE-2026-48166 in filament
Summary
by MITRE • 06/23/2026
Filament is a collection of full-stack components for accelerated Laravel development. From 4.0.0 until 4.11.5 and 5.6.5, the login page has an observable timing discrepancy that allows unauthenticated attackers to enumerate registered email addresses. The impact is limited to disclosing whether an account exists for a given email. This vulnerability is fixed in 4.11.5 and 5.6.5.
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Analysis
by VulDB Data Team • 06/23/2026
The vulnerability in question affects Filament, a popular full-stack Laravel development framework that provides accelerated web application development components. This security issue manifests as a timing discrepancy in the login page functionality across specific version ranges from 4.0.0 through 4.11.5 and 5.6.5. The flaw allows unauthenticated attackers to perform account enumeration by observing differences in response times when attempting to log in with various email addresses. This type of vulnerability falls under the category of timing attacks as described in CWE-203, where an attacker can infer information about system behavior through measurement of time-based characteristics.
The technical implementation of this vulnerability stems from inconsistent response handling during authentication attempts. When a user submits a login request, the system should provide a consistent response time regardless of whether the email address exists in the database. However, in the affected versions, legitimate email addresses produce different timing characteristics compared to non-existent ones, creating a measurable discrepancy that can be exploited through automated tools. This timing inconsistency creates a side-channel attack vector where the attacker can determine account existence without requiring any valid credentials or authentication.
The operational impact of this vulnerability is significant despite its limited scope. While the flaw only reveals whether an email address has a corresponding account in the system, this information alone can enable more sophisticated attacks such as targeted phishing campaigns, credential stuffing attempts against other services where users may have reused passwords, or social engineering operations that leverage knowledge of account existence to build trust with potential victims. The vulnerability affects the authentication security model and can be exploited by attackers without requiring any prior access to the system.
From a cybersecurity perspective, this vulnerability aligns with ATT&CK technique T1078 004 which covers valid accounts obtained through credential reuse, and represents a classic case of information disclosure through timing analysis. The fix implemented in versions 4.11.5 and 5.6.5 addresses the root cause by ensuring consistent response times for all authentication attempts regardless of account existence. Organizations using affected Filament versions should prioritize immediate patching to eliminate this attack vector. Security teams should also consider implementing additional monitoring for unusual login patterns and timing variations that could indicate exploitation attempts, while maintaining compliance with security standards such as NIST SP 800-53 controls related to authentication and access control.
The remediation process involves upgrading to the patched versions of Filament where consistent response handling has been implemented throughout the authentication flow. This fix ensures that all login attempts, whether they reference existing or non-existing accounts, return with identical timing characteristics, eliminating the information leakage that previously enabled account enumeration attacks. Security professionals should also conduct thorough testing to verify that the patch does not introduce any regressions in functionality while maintaining the intended security posture against timing-based reconnaissance attempts.