GHSA-QC86-Q28F-GGWW

Vulnerability from github – Published: 2026-03-03 21:06 – Updated: 2026-03-04 18:39
VLAI?
Summary
Craft CMS has potential authenticated Remote Code Execution via Twig SSTI
Details

For this to work, the attacker must have administrator access to the Craft Control Panel, and allowAdminChanges must be enabled, which is against Craft CMS' recommendations for any non-dev environment.

https://craftcms.com/knowledge-base/securing-craft#set-allowAdminChanges-to-false-in-production

Alternatively, they can have a non-administrator account with allowAdminChanges disabled, but they must have access to the System Messages utility.

It is possible to craft a malicious payload using the Twig map filter in text fields that accept Twig input under Settings in the Craft control panel or using the System Messages utility, which could lead to a RCE.

Users should update to the patched versions (5.8.22 and 4.16.18) to mitigate the issue.

References:

https://github.com/craftcms/cms/pull/18208

Severity ?
6.1 (Medium)
CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U
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{
  "affected": [
    {
      "package": {
        "ecosystem": "Packagist",
        "name": "craftcms/cms"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "5.0.0-RC1"
            },
            {
              "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-2026-28784"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-1336"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-03-03T21:06:41Z",
    "nvd_published_at": "2026-03-04T17:16:21Z",
    "severity": "MODERATE"
  },
  "details": "For this to work, the attacker must have administrator access to the Craft Control Panel, and [allowAdminChanges](https://craftcms.com/docs/5.x/reference/config/general.html#allowadminchanges) must be enabled, which is against Craft CMS\u0027 recommendations for any non-dev environment.\n\nhttps://craftcms.com/knowledge-base/securing-craft#set-allowAdminChanges-to-false-in-production\n\nAlternatively, they can have a non-administrator account with `allowAdminChanges` disabled, but they must have access to the System Messages utility.\n\nIt is possible to craft a malicious payload using the Twig `map` filter in text fields that accept Twig input under Settings in the Craft control panel or using the System Messages utility, which could lead to a RCE.\n\nUsers should update to the patched versions (5.8.22 and 4.16.18) to mitigate the issue.\n\nReferences:\n\nhttps://github.com/craftcms/cms/pull/18208",
  "id": "GHSA-qc86-q28f-ggww",
  "modified": "2026-03-04T18:39:16Z",
  "published": "2026-03-03T21:06:41Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/craftcms/cms/security/advisories/GHSA-qc86-q28f-ggww"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-28784"
    },
    {
      "type": "WEB",
      "url": "https://github.com/craftcms/cms/pull/18208"
    },
    {
      "type": "WEB",
      "url": "https://craftcms.com/knowledge-base/securing-craft#set-allowAdminChanges-to-false-in-production"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/craftcms/cms"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Craft CMS has potential authenticated Remote Code Execution via Twig SSTI"
}


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  • 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.
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  • 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.



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