{"id":"CVE-2026-33157","aliases":["CLSA-2026-1790174106","EUVD-2026-14934","GHSA-2fph-6v5w-89hh"],"status":"published","title":"Craft CMS: Potential authenticated Remote Code Execution via malicious attached Behavior","description":"Craft CMS is a content management system (CMS). From version 5.6.0 to before version 5.9.13, a Remote Code Execution (RCE) vulnerability exists in Craft CMS, it can be exploited by any authenticated user with control panel access. This is a bypass of a previous fix. The 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. This issue has been patched in version 5.9.13.","severity":{"version":"4.0","score":8.6,"vector":"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","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-10","score":0.01139,"percentile":0.66858,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":true,"fix_available":true},"cwes":["CWE-470"],"published":"2026-03-24T16:50:42Z","modified":"2026-10-28T02:30:49Z","exploits":[{"source":"pocgithub","id":"TRX-0/CVE-2026-33157-craftcms-rce","title":"TRX-0/CVE-2026-33157-craftcms-rce","date":"2026-09-21","url":"https://github.com/TRX-0/CVE-2026-33157-craftcms-rce"}],"fixes":[{"ecosystem":"Packagist","package":"craftcms/cms","fixed_in":["5.9.13"],"sources":["ghsa","osv"]},{"ecosystem":"TuxCare:Packagist","package":"craftcms/cms","fixed_in":["3.9.15-p10+tuxcare"],"sources":["osv"]}],"affected":[{"source":"ghsa","ecosystem":"Packagist","package":"craftcms/cms","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"5.6.0"},{"last_affected":"5.9.12"},{"fixed":"5.9.13"}]}]},{"source":"osv","ecosystem":"TuxCare:Packagist","package":"craftcms/cms","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"3.9.15"},{"fixed":"3.9.15-p10+tuxcare"}]}],"versions":["3.9.15","3.9.15-p1+tuxcare","3.9.15-p2+tuxcare","3.9.15-p3+tuxcare","3.9.15-p4+tuxcare","3.9.15-p5+tuxcare","3.9.15-p6+tuxcare","3.9.15-p7+tuxcare","3.9.15-p8+tuxcare","3.9.15-p9+tuxcare"]},{"source":"osv","ecosystem":"Packagist","package":"craftcms/cms","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"5.6.0"},{"fixed":"5.9.13"}]}],"versions":["5.6.0","5.6.0.1","5.6.0.2","5.6.1","5.6.10","5.6.10.1","5.6.10.2","5.6.11","5.6.12","5.6.13","5.6.14","5.6.15","5.6.16","5.6.17","5.6.2","5.6.3","5.6.4","5.6.5","5.6.5.1","5.6.6","5.6.7","5.6.8","5.6.9","5.6.9.1","5.7.0","5.7.0-beta.1","5.7.0-beta.2","5.7.1","5.7.1.1","5.7.10","5.7.11","5.7.2","5.7.3","5.7.4","5.7.5","5.7.6","5.7.7","5.7.8","5.7.8.1","5.7.8.2","5.7.9","5.8.0","5.8.1","5.8.10","5.8.11","5.8.12","5.8.13","5.8.13.1","5.8.13.2","5.8.14","5.8.15","5.8.16","5.8.17","5.8.18","5.8.19","5.8.2","5.8.20","5.8.21","5.8.22","5.8.23","5.8.3","5.8.4","5.8.5","5.8.6","5.8.7","5.8.8","5.8.9","5.9.0","5.9.0-beta.1","5.9.0-beta.2","5.9.1","5.9.10","5.9.11","5.9.12","5.9.2","5.9.3","5.9.4","5.9.5","5.9.6","5.9.7","5.9.8","5.9.9"]}],"products":[{"vendor":"craftcms","product":"cms"},{"vendor":"craftcms","product":"craft_cms"},{"vendor":"statamic","product":"cms"}],"references":[{"url":"https://github.com/craftcms/cms/security/advisories/GHSA-2fph-6v5w-89hh","tags":["x_refsource_CONFIRM","Exploit","Vendor Advisory","advisory","web"]},{"url":"https://github.com/craftcms/cms/commit/97e90b4bdee369c1af3ca77a77531132df240e4e","tags":["x_refsource_MISC","Patch","fix","web"]},{"url":"https://github.com/craftcms/cms/releases/tag/5.9.13","tags":["x_refsource_MISC","Release Notes","web"]},{"url":"https://github.com/advisories/GHSA-255j-qw47-wjh5","tags":["advisory"]},{"url":"https://github.com/advisories/GHSA-7jx7-3846-m7w7","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-33157","tags":["advisory"]},{"url":"https://github.com/advisories/GHSA-2fph-6v5w-89hh"},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/33xxx/CVE-2026-33157.json","tags":["advisory"]},{"url":"https://github.com/craftcms/cms","tags":["package"]}],"sources":{"cve":[{"id":"CVE-2026-33157","title":"Craft CMS: Potential authenticated Remote Code Execution via malicious attached Behavior","description":"Craft CMS is a content management system (CMS). From version 5.6.0 to before version 5.9.13, a Remote Code Execution (RCE) vulnerability exists in Craft CMS, it can be exploited by any authenticated user with control panel access. This is a bypass of a previous fix. The 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. This issue has been patched in version 5.9.13.","status":"published","published":"2026-03-24T17:22:00.966Z","modified":"2026-03-25T03:56:03.039Z","cvss":[{"version":"4.0","score":8.6,"vector":"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","level":"high","assessor":"cna"}],"cwes":["CWE-470"],"updated_at":"2026-11-02T14:20:07.609948Z"}],"euvd":[{"id":"EUVD-2026-14934","description":"Craft CMS is a content management system (CMS). From version 5.6.0 to before version 5.9.13, a Remote Code Execution (RCE) vulnerability exists in Craft CMS, it can be exploited by any authenticated user with control panel access. This is a bypass of a previous fix. The 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. This issue has been patched in version 5.9.13.","status":"published","published":"2026-03-24T17:22:00Z","modified":"2026-03-25T03:56:03Z","cvss":[{"version":"4.0","score":8.6,"vector":"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","level":"high"}],"updated_at":"2026-11-02T19:25:29.547775Z"}],"ghsa":[{"id":"GHSA-2fph-6v5w-89hh","title":"Craft CMS is Vulnerable to Authenticated Remote Code Execution via Malicious Attached Behavior","description":"## 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 = $conditionsService-\u003ecreateCondition($conditionConfig);\n} else {\n    $condition = $this-\u003eelementType()::createCondition();\n}\n\nif (!empty($fieldLayouts)) {\n    // fieldLayouts is NOT cleansed!\n    $condition-\u003esetFieldLayouts(array_map(\n        fn(array $config) =\u003e FieldLayout::createFromConfig($config),\n        $fieldLayouts\n    ));\n}\n```\n\nNote the inconsistency: `conditionConfig` is sanitized with `cleanseConfig()`, but `fieldLayouts` is not.\n\n### Attack Chain\n\n1. Send a `fieldLayouts` array containing config with `\"as \u003cname\u003e\"` prefixed keys\n2. `FieldLayout::createFromConfig($config)` -\u003e `new self($config)` -\u003e `Model::__construct($config)`\n3. `App::configure($this, $config)` processes each key\n4. `\"as rce\"` key -\u003e `Component::__set(\"as rce\", $value)` -\u003e `Yii::createObject($value)` -\u003e instantiates `AttributeTypecastBehavior` and attaches it to the FieldLayout\n5. `\"on *\"` key -\u003e registers a wildcard event handler\n6. `parent::__construct()` -\u003e `init()` -\u003e `setTabs([])` -\u003e `getAvailableNativeFields()` -\u003e `trigger(EVENT_DEFINE_NATIVE_FIELDS)`\n7. The wildcard handler fires -\u003e `AttributeTypecastBehavior::beforeSave()` -\u003e `typecastAttributes()`\n8. `$this-\u003eowner-\u003etypecastBeforeSave` -\u003e resolved via `Component::__get()` -\u003e returns the command string from the behavior's own property\n9. `call_user_func([ConsoleProcessus::class, 'execute'], $command)` -\u003e `shell_exec($command)`\n\n### Prerequisites\n\n- A user account with control panel access","status":"published","published":"2026-03-24T16:50:42Z","modified":"2026-03-25T20:59:39Z","cvss":[{"version":"4.0","score":8.7,"vector":"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","level":"high"}],"cwes":["CWE-470"],"updated_at":"2026-11-02T14:39:42.712607Z"}],"nvd":[{"id":"CVE-2026-33157","description":"Craft CMS is a content management system (CMS). From version 5.6.0 to before version 5.9.13, a Remote Code Execution (RCE) vulnerability exists in Craft CMS, it can be exploited by any authenticated user with control panel access. This is a bypass of a previous fix. The 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. This issue has been patched in version 5.9.13.","status":"published","published":"2026-03-24T18:16:09.59Z","modified":"2026-06-17T10:37:02.773Z","cvss":[{"version":"4.0","score":8.6,"vector":"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:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"high","assessor":"secondary"},{"version":"3.1","score":7.2,"vector":"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H","level":"high","assessor":"primary"}],"cwes":["CWE-470"],"updated_at":"2026-11-02T14:12:10.568062Z"}],"osv":[{"id":"CVE-2026-33157","title":"Craft CMS: Potential authenticated Remote Code Execution via malicious attached Behavior","description":"Craft CMS is a content management system (CMS). From version 5.6.0 to before version 5.9.13, a Remote Code Execution (RCE) vulnerability exists in Craft CMS, it can be exploited by any authenticated user with control panel access. This is a bypass of a previous fix. The 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. This issue has been patched in version 5.9.13.","status":"published","published":"2026-03-24T17:22:00.966Z","modified":"2026-10-28T02:30:49.789239335Z","cvss":[{"version":"4.0","score":8.6,"vector":"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","level":"high"}],"cwes":["CWE-470"],"updated_at":"2026-11-02T15:45:01.548715Z"},{"id":"GHSA-2fph-6v5w-89hh","title":"Craft CMS is Vulnerable to Authenticated Remote Code Execution via Malicious Attached Behavior","description":"## 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 = $conditionsService-\u003ecreateCondition($conditionConfig);\n} else {\n    $condition = $this-\u003eelementType()::createCondition();\n}\n\nif (!empty($fieldLayouts)) {\n    // fieldLayouts is NOT cleansed!\n    $condition-\u003esetFieldLayouts(array_map(\n        fn(array $config) =\u003e FieldLayout::createFromConfig($config),\n        $fieldLayouts\n    ));\n}\n```\n\nNote the inconsistency: `conditionConfig` is sanitized with `cleanseConfig()`, but `fieldLayouts` is not.\n\n### Attack Chain\n\n1. Send a `fieldLayouts` array containing config with `\"as \u003cname\u003e\"` prefixed keys\n2. `FieldLayout::createFromConfig($config)` -\u003e `new self($config)` -\u003e `Model::__construct($config)`\n3. `App::configure($this, $config)` processes each key\n4. `\"as rce\"` key -\u003e `Component::__set(\"as rce\", $value)` -\u003e `Yii::createObject($value)` -\u003e instantiates `AttributeTypecastBehavior` and attaches it to the FieldLayout\n5. `\"on *\"` key -\u003e registers a wildcard event handler\n6. `parent::__construct()` -\u003e `init()` -\u003e `setTabs([])` -\u003e `getAvailableNativeFields()` -\u003e `trigger(EVENT_DEFINE_NATIVE_FIELDS)`\n7. The wildcard handler fires -\u003e `AttributeTypecastBehavior::beforeSave()` -\u003e `typecastAttributes()`\n8. `$this-\u003eowner-\u003etypecastBeforeSave` -\u003e resolved via `Component::__get()` -\u003e returns the command string from the behavior's own property\n9. `call_user_func([ConsoleProcessus::class, 'execute'], $command)` -\u003e `shell_exec($command)`\n\n### Prerequisites\n\n- A user account with control panel access","status":"published","published":"2026-03-24T16:50:42Z","modified":"2026-03-25T21:16:24.491249Z","cvss":[{"version":"4.0","score":8.7,"vector":"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","level":"high"}],"cwes":["CWE-470"],"updated_at":"2026-11-02T15:46:34.338541Z"},{"id":"CLSA-2026-1790174106","title":"TuxCare security update for craftcms/cms (1 CVE)","description":"TuxCare rebuilt craftcms/cms to address 1 CVE. Fixed in 3.9.15-p10+tuxcare.","status":"published","published":"2026-09-23T14:35:06Z","modified":"2026-10-15T09:48:04.675539903Z","updated_at":"2026-11-02T15:43:48.28229Z"}]}}