CVE-2026-64663: Statamic Unsafe Method Invocation Vulnerability

MODERATE
Advisory Identifier: GHSA-j2vp-f2pv-5rj4
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CVSS 6.5
CWE-470
Published
Advisory Summary

CVE-2026-64663 is a MODERATE (CVSS 6.5) unsafe method invocation vulnerability (CWE-470: Use of Externally-Controlled Input to Select Classes or Code ('Unsafe Reflection')) affecting Statamic libraries in the Packagist ecosystem. The issue involves unsafe method invocation via antlers template resolution allows data destruction. Remediation is available by upgrading affected packages to version 5.74.1, 6.24.0.

CVE-2026-64663 at a Glance

CVE Identifier CVE-2026-64663
GHSA Identifier GHSA-j2vp-f2pv-5rj4
Severity MODERATE
CVSS v3.1 Base Score 6.5
CWE Classification CWE-470: Use of Externally-Controlled Input to Select Classes or Code ('Unsafe Reflection')
Affected Product Statamic
Package Ecosystem Packagist
Published Date
Last Updated

Security Impact

CVSS: 6.5

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

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

How to Fix CVE-2026-64663

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: 5.74.1 
Upgrade statamic/cms to 5.74.1
statamic/cms fixed: 6.24.0 
Upgrade statamic/cms to 6.24.0
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-2026-64663, 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 5.74.1), 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-470: Use of Externally-Controlled Input to Select Classes or Code ('Unsafe Reflection'), where the product uses external input with reflection to select which classes or code to use, but it does not sufficiently prevent the input from selecting improper classes or code. 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 Manipulating user-supplied input incorporated into Antlers templates could result in the loss of content and assets. Exploitation requires a site to have templates that pass untrusted input into affected areas. It does not require authentication. ### Patches This has been fixed in 5.74.1 and 6.24.0.

CVE-2026-64663 Affected Statamic Versions

2 component(s)
Fixed Versions:
5.74.16.24.0
Product / Package Ecosystem Affected Versions Fixed Version
statamic/cms
 Packagist
< 5.74.1
5.74.1
statamic/cms
 Packagist
≥ 6.0.0
< 6.24.0
6.24.0

References

GitHub Advisory / Wiki ADVISORY
https://github.com/statamic/cms/security/advisories/GHSA-j2vp-f2pv-5rj4
Statamic Source Repository REPOSITORY
https://github.com/statamic/cms

Frequently Asked Questions

What is CVE-2026-64663?
CVE-2026-64663 is a security vulnerability in Statamic involving Unsafe method invocation via Antlers template resolution allows data destruction under CWE-470: Use of Externally-Controlled Input to Select Classes or Code ('Unsafe Reflection').
Which Statamic versions are affected?
Affected versions include releases prior to 5.74.1, 6.24.0 across affected packages: statamic/cms.
What version fixes CVE-2026-64663?
Upgrading to 5.74.1, 6.24.0 (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 5.74.1, 6.24.0. Upgrade your dependency to 5.74.1, 6.24.0 or later.
What is the CVSS score of CVE-2026-64663?
CVE-2026-64663 has a CVSS v3.1 base score of 6.5 (MODERATE) with vector string CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:H.
What CWE is associated with CVE-2026-64663?
CVE-2026-64663 is classified under CWE-470: Use of Externally-Controlled Input to Select Classes or Code ('Unsafe Reflection') (The product uses external input with reflection to select which classes or code to use, but it does not sufficiently prevent the input from selecting improper classes or code.).
How can I check Packagist dependencies for CVE-2026-64663?
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-j2vp-f2pv-5rj4",
  "modified" : "2026-08-06T19:28:08Z",
  "published" : "2026-08-06T19:28:08Z",
  "aliases" : [ "CVE-2026-64663" ],
  "summary" : "Statamic: Unsafe method invocation via Antlers template resolution allows data destruction",
  "details" : "### Impact\n\nManipulating user-supplied input incorporated into Antlers templates could result in the loss of content and assets.\n\nExploitation requires a site to have templates that pass untrusted input into affected areas. It does not require authentication.\n\n### Patches\n\nThis has been fixed in 5.74.1 and 6.24.0.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:H"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Packagist",
      "name" : "statamic/cms"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "5.74.1"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "Packagist",
      "name" : "statamic/cms"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "6.0.0"
      }, {
        "fixed" : "6.24.0"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/statamic/cms/security/advisories/GHSA-j2vp-f2pv-5rj4"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/statamic/cms"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-470" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-08-06T19:28:08Z",
    "nvd_published_at" : null
  }
}