CVE-2026-28426: Statamic/cms Cross-Site Scripting Vulnerability

HIGH
Advisory Identifier: GHSA-5vrj-wf7v-5wr7
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CVSS 8.7
CWE-79
Published
Advisory Summary

CVE-2026-28426 is a HIGH (CVSS 8.7) cross-site scripting vulnerability (CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')) affecting Statamic/cms libraries in the Packagist ecosystem. The issue involves statamic vulnerable to privilege escalation via stored cross-site scripting. Remediation is available by upgrading affected packages to version 5.73.11, 6.4.0.

CVE-2026-28426 at a Glance

CVE Identifier CVE-2026-28426
GHSA Identifier GHSA-5vrj-wf7v-5wr7
Severity HIGH
CVSS v3.1 Base Score 8.7
CWE Classification CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Affected Product Statamic/cms
Package Ecosystem Packagist
Published Date
Last Updated

Security Impact

CVSS: 8.7

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

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

How to Fix CVE-2026-28426

To remediate this vulnerability, upgrade all affected Statamic/cms 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: 5.73.11 
Upgrade statamic/cms to 5.73.11
statamic/cms fixed: 6.4.0 
Upgrade statamic/cms to 6.4.0
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-2026-28426, inspect your project dependencies for Statamic/cms:

inspect dependencies for statamic/cms

Analyze the terminal output to locate any version of Statamic/cms in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 5.73.11), 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-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting'), where the product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. In Statamic/cms, 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 Stored XSS vulnerability in svg and icon related components allow authenticated users with appropriate permissions to inject malicious JavaScript that executes when viewed by higher-privileged users. ### Patches This has been fixed in 5.73.11 and 6.4.0.

CVE-2026-28426 Affected Statamic/cms Versions

2 component(s)
Fixed Versions:
5.73.116.4.0
Product / Package Ecosystem Affected Versions Fixed Version
statamic/cms
 Packagist
< 5.73.11
5.73.11
statamic/cms
 Packagist
≥ 6.0.0-alpha.1
< 6.4.0
6.4.0

References

GitHub Advisory / Wiki ADVISORY
https://github.com/statamic/cms/security/advisories/GHSA-5vrj-wf7v-5wr7
NVD — CVE-2026-28426 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-28426
Statamic/cms Source Repository REPOSITORY
https://github.com/statamic/cms
Statamic/cms Release RELEASE
https://github.com/statamic/cms/releases/tag/v5.73.11
Statamic/cms Release RELEASE
https://github.com/statamic/cms/releases/tag/v6.4.0

Frequently Asked Questions

What is CVE-2026-28426?
CVE-2026-28426 is a security vulnerability in Statamic/cms involving Statamic vulnerable to privilege escalation via stored cross-site scripting under CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting').
Which Statamic/cms versions are affected?
Affected versions include releases prior to 5.73.11, 6.4.0 across affected packages: statamic/cms.
What version fixes CVE-2026-28426?
Upgrading to 5.73.11, 6.4.0 (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 5.73.11, 6.4.0. Upgrade your dependency to 5.73.11, 6.4.0 or later.
What is the CVSS score of CVE-2026-28426?
CVE-2026-28426 has a CVSS v3.1 base score of 8.7 (HIGH) with vector string CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N.
What CWE is associated with CVE-2026-28426?
CVE-2026-28426 is classified under CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') (The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.).
How can I check Packagist dependencies for CVE-2026-28426?
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-5vrj-wf7v-5wr7",
  "modified" : "2026-03-01T01:31:09Z",
  "published" : "2026-03-01T01:31:09Z",
  "aliases" : [ "CVE-2026-28426" ],
  "summary" : "Statamic vulnerable to privilege escalation via stored cross-site scripting",
  "details" : "### Impact\nStored XSS vulnerability in svg and icon related components allow authenticated users with appropriate permissions to inject malicious JavaScript that executes when viewed by higher-privileged users.\n\n### Patches\nThis has been fixed in 5.73.11 and 6.4.0.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Packagist",
      "name" : "statamic/cms"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "5.73.11"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "Packagist",
      "name" : "statamic/cms"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "6.0.0-alpha.1"
      }, {
        "fixed" : "6.4.0"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/statamic/cms/security/advisories/GHSA-5vrj-wf7v-5wr7"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-28426"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/statamic/cms"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/statamic/cms/releases/tag/v5.73.11"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/statamic/cms/releases/tag/v6.4.0"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-79" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-03-01T01:31:09Z",
    "nvd_published_at" : "2026-02-27T23:16:05Z"
  }
}