CVE-2026-48166: Filament Timing-based User Enumeration On Login Vulnerability

MODERATE
Advisory Identifier: GHSA-5w46-g9pq-wh6f
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CVSS 5.3
CWE-208
Published
Advisory Summary

CVE-2026-48166 is a MODERATE (CVSS 5.3) timing-based user enumeration on login vulnerability (CWE-208: Observable Timing Discrepancy) affecting Filament libraries in the Packagist ecosystem. The issue involves timing-based user enumeration on login page. Remediation is available by upgrading affected packages to version 4.11.5, 5.6.5.

CVE-2026-48166 at a Glance

CVE Identifier CVE-2026-48166
GHSA Identifier GHSA-5w46-g9pq-wh6f
Severity MODERATE
CVSS v3.1 Base Score 5.3
CWE Classification CWE-208: Observable Timing Discrepancy
Affected Product Filament
Package Ecosystem Packagist
Published Date
Last Updated

Security Impact

CVSS: 5.3

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N).

Attack Vector Network (AV:N)
Attack Complexity Low (AC:L)
Privileges Required None (PR:N)
User Interaction None (UI:N)
Scope Unchanged (S:U)
Confidentiality Low (C:L)
Integrity None (I:N)
Availability None (A:N)

How to Fix CVE-2026-48166

To remediate this vulnerability, upgrade all affected Filament dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

filament/filament fixed: 4.11.5 
Upgrade filament/filament to 4.11.5
filament/filament fixed: 5.6.5 
Upgrade filament/filament to 5.6.5
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

inspect dependencies for filament/filament

How to Check if You Are Affected

To determine whether your application is affected by CVE-2026-48166, inspect your project dependencies for Filament:

inspect dependencies for filament/filament

Analyze the terminal output to locate any version of Filament in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 4.11.5), your application is affected.

Note: Verify declared build manifests and deployed runtime container environments.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-208: Observable Timing Discrepancy, where two separate operations in a product require different amounts of time to complete, in a way that is observable to an actor and reveals security-relevant information about the state of the product, such as whether a particular operation was successful or not. In Filament, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

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.

CVE-2026-48166 Affected Filament Versions

2 component(s)
Fixed Versions:
4.11.55.6.5
Product / Package Ecosystem Affected Versions Fixed Version
filament/filament
 Packagist
≥ 4.0.0
< 4.11.5
4.11.5
filament/filament
 Packagist
≥ 5.0.0
< 5.6.5
5.6.5

References

GitHub Advisory / Wiki ADVISORY
https://github.com/filamentphp/filament/security/advisories/GHSA-5w46-g9pq-wh6f
NVD — CVE-2026-48166 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-48166
Filament Source Repository REPOSITORY
https://github.com/filamentphp/filament

Frequently Asked Questions

What is CVE-2026-48166?
CVE-2026-48166 is a security vulnerability in Filament involving Timing-based user enumeration on login page under CWE-208: Observable Timing Discrepancy.
Which Filament versions are affected?
Affected versions include releases prior to 4.11.5, 5.6.5 across affected packages: filament/filament.
What version fixes CVE-2026-48166?
Upgrading to 4.11.5, 5.6.5 (or the latest patched release for your respective branch) resolves the vulnerability.
Is filament/filament affected?
Yes, filament/filament is affected in releases prior to 4.11.5, 5.6.5. Upgrade your dependency to 4.11.5, 5.6.5 or later.
What is the CVSS score of CVE-2026-48166?
CVE-2026-48166 has a CVSS v3.1 base score of 5.3 (MODERATE) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N.
What CWE is associated with CVE-2026-48166?
CVE-2026-48166 is classified under CWE-208: Observable Timing Discrepancy (Two separate operations in a product require different amounts of time to complete, in a way that is observable to an actor and reveals security-relevant information about the state of the product, such as whether a particular operation was successful or not.).
How can I check Packagist dependencies for CVE-2026-48166?
Run the dependency tree command: 'inspect dependencies for filament/filament'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-5w46-g9pq-wh6f",
  "modified" : "2026-06-23T21:54:35Z",
  "published" : "2026-06-23T21:54:35Z",
  "aliases" : [ "CVE-2026-48166" ],
  "summary" : "Filament: Timing-based user enumeration on login page",
  "details" : "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.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Packagist",
      "name" : "filament/filament"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "4.0.0"
      }, {
        "fixed" : "4.11.5"
      } ]
    } ],
    "database_specific" : {
      "last_known_affected_version_range" : "<= 4.11.4"
    }
  }, {
    "package" : {
      "ecosystem" : "Packagist",
      "name" : "filament/filament"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "5.0.0"
      }, {
        "fixed" : "5.6.5"
      } ]
    } ],
    "database_specific" : {
      "last_known_affected_version_range" : "<= 5.6.4"
    }
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/filamentphp/filament/security/advisories/GHSA-5w46-g9pq-wh6f"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-48166"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/filamentphp/filament"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-208" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-06-23T21:54:35Z",
    "nvd_published_at" : "2026-06-22T22:16:46Z"
  }
}