CVE-2026-41325: Getkirby/cms Kirby Is Vulnerable To Authorization Vulnerability

{
  "schema_version" : "1.4.0",
  "id" : "GHSA-6gqr-mx34-wh8r",
  "modified" : "2026-04-24T20:39:36Z",
  "published" : "2026-04-24T20:39:36Z",
  "aliases" : [ "CVE-2026-41325" ],
  "summary" : "Kirby is vulnerable to authorization bypass during page, file and user creation via blueprint injection",
  "details" : "### TL;DR\n\nThis vulnerability affects all Kirby sites where users of a particular role have no permission to create pages, files or users (`pages.create`, `files.create` or `users.create` permission is disabled). This can be due to configuration in the user blueprint(s), via `options` in the model blueprint(s) or via a combination of both settings.\n\n**This vulnerability is of high severity for affected sites.**\n\nDevelopers' Kirby sites are *not* affected if they intend all users of their site to be able to create pages, files and users. The vulnerability can only be exploited by authenticated users.\n\n----\n\n### Introduction\n\nAn authorization bypass allows authenticated users to perform actions they should not be allowed to perform based on their configured permissions, thereby causing a privilege escalation.\n\nThe effects of an authorization bypass can include unauthorized access to sensitive information as well as unauthorized changes to content or system information.\n\n### Impact\n\nKirby's user permissions control which user role is allowed to perform specific actions to content models in the CMS. These permissions are defined for each role in the user blueprint (`site/blueprints/users/...`). It is also possible to customize the permissions for each target model in the model blueprints (such as in `site/blueprints/pages/...`) using the `options` feature. The permissions and options together control the authorization of user actions.\n\nKirby provides the `pages.create`, `files.create` and `users.create` permissions (among others). These permissions can again be set in the user blueprint and/or in the blueprint of the target model via `options`. In affected releases, Kirby allowed to override the `options` during the creation of pages, files and users by injecting custom dynamic blueprint configuration into the model data. The injected `options` could include `'create' => true`, which then caused an override of the permissions and options configured by the site developer in the user and model blueprints.\n\n### Patches\n\nThe problem has been patched in [Kirby 4.9.0](https://github.com/getkirby/kirby/releases/tag/4.9.0) and [Kirby 5.4.0](https://github.com/getkirby/kirby/releases/tag/5.4.0). Please update to one of these or a [later version](https://github.com/getkirby/kirby/releases) to fix the vulnerability.\n\nIn all of the mentioned releases, we have updated the normalization code that is used during the creation of pages, files and users to include a filter for the `blueprint` property. This prevents the injection of dynamic blueprint configuration into the creation request.\n\n### Credits\n\nKirby thanks @offset for responsibly reporting the identified issue.",
  "severity" : [ {
    "type" : "CVSS_V4",
    "score" : "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Packagist",
      "name" : "getkirby/cms"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "4.9.0"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "Packagist",
      "name" : "getkirby/cms"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "5.0.0"
      }, {
        "fixed" : "5.4.0"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/getkirby/kirby/security/advisories/GHSA-6gqr-mx34-wh8r"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-41325"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/getkirby/kirby"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/getkirby/kirby/releases/tag/4.9.0"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/getkirby/kirby/releases/tag/5.4.0"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-863" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-04-24T20:39:36Z",
    "nvd_published_at" : "2026-04-24T01:16:12Z"
  }
}