CVE-2026-71434: Statamic Missing File Upload Validation On Vulnerability

MODERATE
Advisory Identifier: GHSA-qhr7-v3xp-vw9m
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CVSS 5.3
CWE-434
Published
Advisory Summary

CVE-2026-71434 is a MODERATE (CVSS 5.3) missing file upload validation on vulnerability (CWE-434: Unrestricted Upload of File with Dangerous Type) affecting Statamic libraries in the Packagist ecosystem. The issue involves missing file upload validation on frontend forms allows uploading disallowed file types. Remediation is available by upgrading affected packages to version 5.74.3, 6.24.2.

CVE-2026-71434 at a Glance

CVE Identifier CVE-2026-71434
GHSA Identifier GHSA-qhr7-v3xp-vw9m
Severity MODERATE
CVSS v3.1 Base Score 5.3
CWE Classification CWE-434: Unrestricted Upload of File with Dangerous Type
Affected Product Statamic
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:N/I:L/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 None (C:N)
Integrity Low (I:L)
Availability None (A:N)

How to Fix CVE-2026-71434

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

statamic/cms fixed: 5.74.3 
Upgrade statamic/cms to 5.74.3
statamic/cms fixed: 6.24.2 
Upgrade statamic/cms to 6.24.2
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 statamic/cms

How to Check if You Are Affected

To determine whether your application is affected by CVE-2026-71434, inspect your project dependencies for Statamic:

inspect dependencies for statamic/cms

Analyze the terminal output to locate any version of Statamic in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 5.74.3), 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-434: Unrestricted Upload of File with Dangerous Type, where the product allows the upload or transfer of dangerous file types that are automatically processed within its environment. In Statamic, 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

### Impact Public frontend forms did not enforce the file upload restrictions that the Control Panel enforces, so an unauthenticated visitor could upload file types an administrator had intended to disallow through a form's `assets` or `files` field. For `assets` fields, files could be stored on a public, web-accessible disk. Statamic's global upload allowlist still applied, so executable types such as `.php` and `.html` remained blocked. ### Patches This has been fixed in 5.74.3 and 6.24.2.

CVE-2026-71434 Affected Statamic Versions

2 component(s)
Fixed Versions:
5.74.36.24.2
Product / Package Ecosystem Affected Versions Fixed Version
statamic/cms
 Packagist
< 5.74.3
5.74.3
statamic/cms
 Packagist
≥ 6.0.0
< 6.24.2
6.24.2

References

GitHub Advisory / Wiki ADVISORY
https://github.com/statamic/cms/security/advisories/GHSA-qhr7-v3xp-vw9m
Statamic Source Repository REPOSITORY
https://github.com/statamic/cms/pull/14958
Security Fix Commit FIX COMMIT
https://github.com/statamic/cms/commit/8be7b6c961536d3173ec4e0965d17b1cf820b7ae
Statamic Source Repository REPOSITORY
https://github.com/statamic/cms
Statamic Release RELEASE
https://github.com/statamic/cms/releases/tag/v5.74.3
Statamic Release RELEASE
https://github.com/statamic/cms/releases/tag/v6.24.2

Frequently Asked Questions

What is CVE-2026-71434?
CVE-2026-71434 is a security vulnerability in Statamic involving Missing file upload validation on frontend forms allows uploading disallowed file types under CWE-434: Unrestricted Upload of File with Dangerous Type.
Which Statamic versions are affected?
Affected versions include releases prior to 5.74.3, 6.24.2 across affected packages: statamic/cms.
What version fixes CVE-2026-71434?
Upgrading to 5.74.3, 6.24.2 (or the latest patched release for your respective branch) resolves the vulnerability.
Is statamic/cms affected?
Yes, statamic/cms is affected in releases prior to 5.74.3, 6.24.2. Upgrade your dependency to 5.74.3, 6.24.2 or later.
What is the CVSS score of CVE-2026-71434?
CVE-2026-71434 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:N/I:L/A:N.
What CWE is associated with CVE-2026-71434?
CVE-2026-71434 is classified under CWE-434: Unrestricted Upload of File with Dangerous Type (The product allows the upload or transfer of dangerous file types that are automatically processed within its environment.).
How can I check Packagist dependencies for CVE-2026-71434?
Run the dependency tree command: 'inspect dependencies for statamic/cms'. 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-qhr7-v3xp-vw9m",
  "modified" : "2026-08-06T19:35:00Z",
  "published" : "2026-08-06T19:35:00Z",
  "aliases" : [ "CVE-2026-71434" ],
  "summary" : "Statamic: Missing file upload validation on frontend forms allows uploading disallowed file types",
  "details" : "### Impact\nPublic frontend forms did not enforce the file upload restrictions that the Control Panel enforces, so an unauthenticated visitor could upload file types an administrator had intended to disallow through a form's `assets` or `files` field. For `assets` fields, files could be stored on a public, web-accessible disk. Statamic's global upload allowlist still applied, so executable types such\nas `.php` and `.html` remained blocked.\n\n\n### Patches\nThis has been fixed in 5.74.3 and 6.24.2.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Packagist",
      "name" : "statamic/cms"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "5.74.3"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "Packagist",
      "name" : "statamic/cms"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "6.0.0"
      }, {
        "fixed" : "6.24.2"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/statamic/cms/security/advisories/GHSA-qhr7-v3xp-vw9m"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/statamic/cms/pull/14958"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/statamic/cms/commit/8be7b6c961536d3173ec4e0965d17b1cf820b7ae"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/statamic/cms"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/statamic/cms/releases/tag/v5.74.3"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/statamic/cms/releases/tag/v6.24.2"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-434" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-08-06T19:35:00Z",
    "nvd_published_at" : null
  }
}