Vulnerability-Lookup

CVE-2026-28695 (GCVE-0-2026-28695)

Vulnerability from cvelistv5 – Published: 2026-03-04 16:15 – Updated: 2026-03-06 05:01

Title

Craft affected by authenticated RCE via Twig SSTI - create() function + Symfony Process gadget

Summary

Craft is a content management system (CMS). There is an authenticated admin RCE in Craft CMS 5.8.21 via Server-Side Template Injection using the create() Twig function combined with a Symfony Process gadget chain. The create() Twig function exposes Craft::createObject(), which allows instantiation of arbitrary PHP classes with constructor arguments. Combined with the bundled symfony/process dependency, this enables RCE. This bypasses the fix implemented for CVE-2025-57811 (patched in 5.8.7). This vulnerability is fixed in 5.9.0-beta.1 and 4.17.0-beta.1.

Severity ?

7.5 (High)


                        
                          CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

CWE

CWE-1336 - Improper Neutralization of Special Elements Used in a Template Engine

Assigner

GitHub_M

References

URL

Tags

	https://github.com/craftcms/cms/security/advisori…	x_refsource_CONFIRM
	https://github.com/craftcms/cms/commit/e31e50849a…	x_refsource_MISC

Impacted products

	Vendor	Product	Version
	craftcms	cms	Affected: >= 5.8.7, < 5.9.0-beta.1 Affected: >= 4.0.0-RC1, < 4.17.0-beta.1

Show details on NVD website

JSON

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FKIE_CVE-2026-28695

Vulnerability from fkie_nvd - Published: 2026-03-04 17:16 - Updated: 2026-03-05 19:54

Severity ?

7.2 (High) - CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

Summary

References

	URL	Tags
	security-advisories@github.com	https://github.com/craftcms/cms/commit/e31e50849ad71638e11ea55fbd1ed90ae8f8f6e0	Patch
	security-advisories@github.com	https://github.com/craftcms/cms/security/advisories/GHSA-94rc-cqvm-m4pw	Exploit, Mitigation, Patch, Vendor Advisory

Impacted products

Vendor	Product	Version
craftcms	craft_cms	*
craftcms	craft_cms	*
craftcms	craft_cms	4.0.0
craftcms	craft_cms	4.0.0
craftcms	craft_cms	4.0.0
craftcms	craft_cms	4.0.0
craftcms	craft_cms	5.0.0
craftcms	craft_cms	5.0.0

JSON

To clipboard

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        "Vendor Advisory"
      ],
      "url": "https://github.com/craftcms/cms/security/advisories/GHSA-94rc-cqvm-m4pw"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-1336"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Primary"
    }
  ]
}

GHSA-94RC-CQVM-M4PW

Vulnerability from github – Published: 2026-03-03 20:30 – Updated: 2026-03-04 18:38

Summary

Craft CMS Vulnerable to Authenticated RCE via Twig SSTI - create() function + Symfony Process gadget

Details

There is an authenticated admin RCE in Craft CMS 5.8.21 via Server-Side Template Injection using the create() Twig function combined with a Symfony Process gadget chain.

This bypasses the fix implemented for CVE-2025-57811 (patched in 5.8.7).

Required Permissions

Administrator permissions or access to System Messages utility
allowAdminChanges enabled in production (against our security recommendations) or access to System Messages utility

Vulnerability Details

The create() Twig function exposes Craft::createObject(), which allows instantiation of arbitrary PHP classes with constructor arguments. Combined with the bundled symfony/process dependency, this enables RCE.

Attack Vector

Admin panel → Settings → Entry Types → Title Format field

Proof of Concept Payload

{% set p = create("Symfony\\Component\\Process\\Process", [["id"]])
%}{{ p.mustRun.getOutput }}

Steps to Reproduce

Log in as admin
Navigate to Settings → Entry Types
Edit any entry type’s "Title Format" field
Insert the payload above
Create/edit an entry of that type
Command executes, output appears in entry title

Impact

Authenticated Remote Code Execution
Runs as web server user (root in default Docker setup)
Full server compromise

Root Cause

Craft::createObject() allows the instantiation of any class, including Symfony\Component\Process\Process, which executes shell commands.

Suggested Fix

Blocklist dangerous classes in createObject() when called from Twig
Or remove/restrict the create() Twig function
Or validate class names against an allowlist

Resources

https://github.com/craftcms/cms/commit/e31e50849ad71638e11ea55fbd1ed90ae8f8f6e0

Severity ?

6.6 (Medium)


                  
                    CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "Packagist",
        "name": "craftcms/cms"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "5.8.7"
            },
            {
              "fixed": "5.9.0-beta.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Packagist",
        "name": "craftcms/cms"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "4.0.0-RC1"
            },
            {
              "fixed": "4.17.0-beta.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-28695"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-1336",
      "CWE-22",
      "CWE-94"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-03-03T20:30:36Z",
    "nvd_published_at": "2026-03-04T17:16:20Z",
    "severity": "MODERATE"
  },
  "details": "There is an authenticated admin RCE in Craft CMS 5.8.21 via Server-Side Template Injection using the `create()` Twig function combined with a Symfony Process gadget chain.\n\nThis bypasses the fix implemented for CVE-2025-57811 (patched in 5.8.7).\n\n## Required Permissions\n\n- Administrator permissions or access to System Messages utility\n- `allowAdminChanges` enabled in production ([against our security recommendations](https://craftcms.com/knowledge-base/securing-craft#set-allowAdminChanges-to-false-in-production))  or access to System Messages utility\n\n## Vulnerability Details\nThe `create()` Twig function exposes `Craft::createObject()`, which allows instantiation of arbitrary PHP classes with constructor arguments. Combined with the bundled `symfony/process` dependency, this enables RCE.\n\n## Attack Vector\nAdmin panel \u2192 Settings \u2192 Entry Types \u2192 Title Format field\n\n## Proof of Concept Payload\n\n```\n{% set p = create(\"Symfony\\\\Component\\\\Process\\\\Process\", [[\"id\"]])\n%}{{ p.mustRun.getOutput }}\n```\n\n## Steps to Reproduce\n1. Log in as admin\n2. Navigate to Settings \u2192 Entry Types\n3. Edit any entry type\u2019s \"Title Format\" field\n4. Insert the payload above\n5. Create/edit an entry of that type\n6. Command executes, output appears in entry title\n\n## Impact\n- Authenticated Remote Code Execution\n- Runs as web server user (root in default Docker setup)\n- Full server compromise\n\n## Root Cause\nCraft::createObject() allows the instantiation of any class, including\n`Symfony\\Component\\Process\\Process`, which executes shell commands.\n\n## Suggested Fix\n\n- Blocklist dangerous classes in createObject() when called from Twig\n- Or remove/restrict the create() Twig function\n- Or validate class names against an allowlist\n\n## Resources\n\nhttps://github.com/craftcms/cms/commit/e31e50849ad71638e11ea55fbd1ed90ae8f8f6e0",
  "id": "GHSA-94rc-cqvm-m4pw",
  "modified": "2026-03-04T18:38:42Z",
  "published": "2026-03-03T20:30:36Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/craftcms/cms/security/advisories/GHSA-94rc-cqvm-m4pw"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-28695"
    },
    {
      "type": "WEB",
      "url": "https://github.com/craftcms/cms/commit/e31e50849ad71638e11ea55fbd1ed90ae8f8f6e0"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/craftcms/cms"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Craft CMS Vulnerable to Authenticated RCE via Twig SSTI - create() function + Symfony Process gadget"
}

Sightings

Author	Source	Type	Date

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

Action not permitted

CVE-2026-28695 (GCVE-0-2026-28695)

FKIE_CVE-2026-28695

GHSA-94RC-CQVM-M4PW

Required Permissions

Vulnerability Details

Attack Vector

Proof of Concept Payload

Steps to Reproduce

Impact

Root Cause

Suggested Fix

Resources

Tags

Sightings

Nomenclature