CVE-2026-41129: Craftcms/cms Server-Side Request Forgery (SSRF) Vulnerability

MODERATE
Advisory Identifier: GHSA-3m9m-24vh-39wx
Share
CWE-918
Published
Advisory Summary

CVE-2026-41129 is a MODERATE server-side request forgery (ssrf) vulnerability (CWE-918: Server-Side Request Forgery (SSRF)) affecting Craftcms/cms libraries in the Packagist ecosystem. The issue involves server-side request forgery (ssrf) in craft cms with asset uploads mutations. Remediation is available by upgrading affected packages to version 5.9.15, 4.17.9.

CVE-2026-41129 at a Glance

CVE Identifier CVE-2026-41129
GHSA Identifier GHSA-3m9m-24vh-39wx
Severity MODERATE
CVSS v3.1 Base Score N/A
CWE Classification CWE-918: Server-Side Request Forgery (SSRF)
Affected Product Craftcms/cms
Package Ecosystem Packagist
Published Date
Last Updated

How to Fix CVE-2026-41129

To remediate this vulnerability, upgrade all affected Craftcms/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.

craftcms/cms fixed: 5.9.15 
Upgrade craftcms/cms to 5.9.15
craftcms/cms fixed: 4.17.9 
Upgrade craftcms/cms to 4.17.9
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 craftcms/cms

How to Check if You Are Affected

To determine whether your application is affected by CVE-2026-41129, inspect your project dependencies for Craftcms/cms:

inspect dependencies for craftcms/cms

Analyze the terminal output to locate any version of Craftcms/cms in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 5.9.15), 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-918: Server-Side Request Forgery (SSRF), where the web server receives a url or similar request from an upstream component and retrieves the contents of this url, but it does not sufficiently ensure that the request is being sent to the expected destination. In Craftcms/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

## Required Permissions The exploitation requires a few permissions to be enabled in the used GraphQL schema: * "Edit assets in the <VolumeName> volume" * "Create assets in the <VolumeName> volume" ## Details The implementation fails to restrict the URL Scheme. While the application is intended to "upload assets", there is no whitelist forcing `http` or `https`. This allows attackers to use the Gopher protocol to wrap raw TCP commands. **Impact:** Combined with the DWORD bypass, an attacker can hit internal services without triggering any "127.0.0.1" string-matching filters. **Example Payload:** gopher://2130706433:6379/_FLUSHALL (Targets local Redis via DWORD). **Remediation Strategy** To prevent mathematical IP obfuscation, the application must normalize the hostname before validation.

CVE-2026-41129 Affected Craftcms/cms Versions

2 component(s)
Fixed Versions:
5.9.154.17.9
Product / Package Ecosystem Affected Versions Fixed Version
craftcms/cms
 Packagist
≥ 5.0.0-RC1
< 5.9.15
5.9.15
craftcms/cms
 Packagist
≥ 4.0.0-RC1
< 4.17.9
4.17.9

References

GitHub Advisory / Wiki ADVISORY
https://github.com/craftcms/cms/security/advisories/GHSA-3m9m-24vh-39wx
NVD — CVE-2026-41129 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-41129
Security Fix Commit FIX COMMIT
https://github.com/craftcms/cms/commit/d20aecfaa0eae076c4154be3b17e1f9fa05ce46f
Craftcms/cms Source Repository REPOSITORY
https://github.com/craftcms/cms

Frequently Asked Questions

What is CVE-2026-41129?
CVE-2026-41129 is a security vulnerability in Craftcms/cms involving Server-Side Request Forgery (SSRF) in Craft CMS with Asset Uploads Mutations under CWE-918: Server-Side Request Forgery (SSRF).
Which Craftcms/cms versions are affected?
Affected versions include releases prior to 5.9.15, 4.17.9 across affected packages: craftcms/cms.
What version fixes CVE-2026-41129?
Upgrading to 5.9.15, 4.17.9 (or the latest patched release for your respective branch) resolves the vulnerability.
Is craftcms/cms affected?
Yes, craftcms/cms is affected in releases prior to 5.9.15, 4.17.9. Upgrade your dependency to 5.9.15, 4.17.9 or later.
What CWE is associated with CVE-2026-41129?
CVE-2026-41129 is classified under CWE-918: Server-Side Request Forgery (SSRF) (The web server receives a URL or similar request from an upstream component and retrieves the contents of this URL, but it does not sufficiently ensure that the request is being sent to the expected destination.).
How can I check Packagist dependencies for CVE-2026-41129?
Run the dependency tree command: 'inspect dependencies for craftcms/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-3m9m-24vh-39wx",
  "modified" : "2026-04-24T20:42:13Z",
  "published" : "2026-04-14T23:35:16Z",
  "aliases" : [ "CVE-2026-41129" ],
  "summary" : "Server-Side Request Forgery (SSRF) in Craft CMS with Asset Uploads Mutations",
  "details" : "## Required Permissions\n\nThe exploitation requires a few permissions to be enabled in the used GraphQL schema:\n\n* \"Edit assets in the <VolumeName> volume\"\n* \"Create assets in the <VolumeName> volume\"\n\n## Details\n\nThe implementation fails to restrict the URL Scheme. While the application is intended to \"upload assets\", there is no whitelist forcing `http` or `https`. This allows attackers to use the Gopher protocol to wrap raw TCP commands.\n\n**Impact:** Combined with the DWORD bypass, an attacker can hit internal services without triggering any \"127.0.0.1\" string-matching filters.\n\n**Example Payload:** gopher://2130706433:6379/_FLUSHALL (Targets local Redis via DWORD).\n\n**Remediation Strategy**\n\nTo prevent mathematical IP obfuscation, the application must normalize the hostname before validation.",
  "severity" : [ {
    "type" : "CVSS_V4",
    "score" : "CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N/E:P"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Packagist",
      "name" : "craftcms/cms"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "5.0.0-RC1"
      }, {
        "fixed" : "5.9.15"
      } ]
    } ],
    "database_specific" : {
      "last_known_affected_version_range" : "<= 5.9.14"
    }
  }, {
    "package" : {
      "ecosystem" : "Packagist",
      "name" : "craftcms/cms"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "4.0.0-RC1"
      }, {
        "fixed" : "4.17.9"
      } ]
    } ],
    "database_specific" : {
      "last_known_affected_version_range" : "<= 4.17.8"
    }
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/craftcms/cms/security/advisories/GHSA-3m9m-24vh-39wx"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-41129"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/craftcms/cms/commit/d20aecfaa0eae076c4154be3b17e1f9fa05ce46f"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/craftcms/cms"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-918" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-04-14T23:35:16Z",
    "nvd_published_at" : "2026-04-22T00:16:28Z"
  }
}