GHSA-H6JM-F4HH-FW27

Vulnerability from github – Published: 2026-04-21 16:44 – Updated: 2026-04-21 16:44
VLAI?
Summary
October CMS has Safe Mode Bypass via Twig Database Write Operations
Details

A vulnerability was identified in the Twig sandbox security policy that allowed database write operations when cms.safe_mode is enabled. Backend users with Developer permissions could use Twig template markup to execute insert, update, and delete operations on any database table through the query builder, which is included in the sandbox allow-list.

Impact

  • Arbitrary database writes including modification or deletion of any table
  • Requires authenticated backend access with Developer permissions
  • Only relevant when cms.safe_mode is enabled (otherwise direct PHP injection is already possible)

Patches

The vulnerability has been patched in v3.7.14 and v4.1.10. Write operations such as insert, update, delete, and truncate are now blocked on query builder and model objects within the Twig sandbox. All users are encouraged to upgrade to the latest patched version.

Workarounds

If upgrading immediately is not possible: - Restrict Developer tool access to fully trusted administrators only

Reporter

Severity ?
6.6 (Medium)
CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H
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{
  "affected": [
    {
      "package": {
        "ecosystem": "Packagist",
        "name": "october/october"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "3.7.14"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Packagist",
        "name": "october/october"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "4.0.0"
            },
            {
              "fixed": "4.1.10"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-26274"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-184",
      "CWE-863"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-04-21T16:44:19Z",
    "nvd_published_at": null,
    "severity": "MODERATE"
  },
  "details": "A vulnerability was identified in the Twig sandbox security policy that allowed database write operations when `cms.safe_mode` is enabled. Backend users with Developer permissions could use Twig template markup to execute insert, update, and delete operations on any database table through the query builder, which is included in the sandbox allow-list.\n\n### Impact\n- Arbitrary database writes including modification or deletion of any table\n- Requires authenticated backend access with Developer permissions\n- Only relevant when `cms.safe_mode` is enabled (otherwise direct PHP injection is already possible)\n\n### Patches\nThe vulnerability has been patched in v3.7.14 and v4.1.10. Write operations such as `insert`, `update`, `delete`, and `truncate` are now blocked on query builder and model objects within the Twig sandbox. All users are encouraged to upgrade to the latest patched version.\n\n### Workarounds\nIf upgrading immediately is not possible:\n- Restrict Developer tool access to fully trusted administrators only\n\n### Reporter\n- Reported by [Chris Alupului](https://github.com/neosprings)",
  "id": "GHSA-h6jm-f4hh-fw27",
  "modified": "2026-04-21T16:44:19Z",
  "published": "2026-04-21T16:44:19Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/octobercms/october/security/advisories/GHSA-h6jm-f4hh-fw27"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/octobercms/october"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "October CMS has Safe Mode Bypass via Twig Database Write Operations"
}


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  • 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.



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