Publish GHSA-2fph-6v5w-89hh

Author: advisory-database[bot]

advisories/github-reviewed/2026/03/GHSA-2fph-6v5w-89hh/GHSA-2fph-6v5w-89hh.json

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+{
+  "schema_version": "1.4.0",
+  "id": "GHSA-2fph-6v5w-89hh",
+  "modified": "2026-03-24T16:50:42Z",
+  "published": "2026-03-24T16:50:42Z",
+  "aliases": [
+    "CVE-2026-33157"
+  ],
+  "summary": "Craft CMS is Vulnerable to Authenticated Remote Code Execution via Malicious Attached Behavior",
+  "details": "## Summary\n\nA Remote Code Execution (RCE) vulnerability exists in Craft CMS 5.x and 4.x that bypasses the security fixes for GHSA-7jx7-3846-m7w7 and GHSA-255j-qw47-wjh5. This vulnerability can be exploited by any authenticated user with control panel access.\n\nThe existing patches add `cleanseConfig()` to `assembleLayoutFromPost()` and various `FieldsController` actions to strip Yii2 behavior/event injection keys (`as ` and `on ` prefixed keys). However, the `fieldLayouts` parameter in `ElementIndexesController::actionFilterHud()` is passed directly to `FieldLayout::createFromConfig()` without any sanitization, enabling the same behavior injection attack chain.\n\n## Impact\n\n- **Attack Type**: Remote Code Execution (RCE)\n- **Authentication Required**: Authenticated user with control panel access (`accessCp` permission)\n\n## Vulnerability Details\n\n### Root Cause\n\nIn `ElementIndexesController::actionFilterHud()` (line 493-494), the `fieldLayouts` body parameter is passed to `FieldLayout::createFromConfig()` without `cleanseConfig()`:\n\n```php\n// ElementIndexesController.php:485-494\nif ($conditionConfig) {\n    $conditionConfig = Component::cleanseConfig($conditionConfig); // conditionConfig IS cleansed\n    $condition = $conditionsService->createCondition($conditionConfig);\n} else {\n    $condition = $this->elementType()::createCondition();\n}\n\nif (!empty($fieldLayouts)) {\n    // fieldLayouts is NOT cleansed!\n    $condition->setFieldLayouts(array_map(\n        fn(array $config) => FieldLayout::createFromConfig($config),\n        $fieldLayouts\n    ));\n}\n```\n\nNote the inconsistency: `conditionConfig` is sanitized with `cleanseConfig()`, but `fieldLayouts` is not.\n\n### Attack Chain\n\n1. Send a `fieldLayouts` array containing config with `\"as <name>\"` prefixed keys\n2. `FieldLayout::createFromConfig($config)` -> `new self($config)` -> `Model::__construct($config)`\n3. `App::configure($this, $config)` processes each key\n4. `\"as rce\"` key -> `Component::__set(\"as rce\", $value)` -> `Yii::createObject($value)` -> instantiates `AttributeTypecastBehavior` and attaches it to the FieldLayout\n5. `\"on *\"` key -> registers a wildcard event handler\n6. `parent::__construct()` -> `init()` -> `setTabs([])` -> `getAvailableNativeFields()` -> `trigger(EVENT_DEFINE_NATIVE_FIELDS)`\n7. The wildcard handler fires -> `AttributeTypecastBehavior::beforeSave()` -> `typecastAttributes()`\n8. `$this->owner->typecastBeforeSave` -> resolved via `Component::__get()` -> returns the command string from the behavior's own property\n9. `call_user_func([ConsoleProcessus::class, 'execute'], $command)` -> `shell_exec($command)`\n\n### Prerequisites\n\n- A user account with control panel access",
+  "severity": [
+    {
+      "type": "CVSS_V4",
+      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N"
+    }
+  ],
+  "affected": [
+    {
+      "package": {
+        "ecosystem": "Packagist",
+        "name": "craftcms/cms"
+      },
+      "ranges": [
+        {
+          "type": "ECOSYSTEM",
+          "events": [
+            {
+              "introduced": "5.6.0"
+            },
+            {
+              "fixed": "5.9.13"
+            }
+          ]
+        }
+      ],
+      "database_specific": {
+        "last_known_affected_version_range": "<= 5.9.12"
+      }
+    }
+  ],
+  "references": [
+    {
+      "type": "WEB",
+      "url": "https://github.com/craftcms/cms/security/advisories/GHSA-2fph-6v5w-89hh"
+    },
+    {
+      "type": "WEB",
+      "url": "https://github.com/craftcms/cms/commit/97e90b4bdee369c1af3ca77a77531132df240e4e"
+    },
+    {
+      "type": "ADVISORY",
+      "url": "https://github.com/advisories/GHSA-255j-qw47-wjh5"
+    },
+    {
+      "type": "ADVISORY",
+      "url": "https://github.com/advisories/GHSA-7jx7-3846-m7w7"
+    },
+    {
+      "type": "PACKAGE",
+      "url": "https://github.com/craftcms/cms"
+    },
+    {
+      "type": "WEB",
+      "url": "https://github.com/craftcms/cms/releases/tag/5.9.13"
+    }
+  ],
+  "database_specific": {
+    "cwe_ids": [
+      "CWE-470"
+    ],
+    "severity": "HIGH",
+    "github_reviewed": true,
+    "github_reviewed_at": "2026-03-24T16:50:42Z",
+    "nvd_published_at": null
+  }
+}