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      <title>fkie_cve-2026-72778</title>
      <link>https://vulnerability.circl.lu/vuln/fkie_cve-2026-72778</link>
      <description>&lt;p&gt;Craft CMS versions from 4.0.0-RC1 before 4.18.2 and from 5.0.0-RC1 before 5.10.6 contain an authenticated remote code execution vulnerability in the control panel element-search condition handling. Craft cleanses the outer request-controlled condition array via Component::cleanseConfig(), but Conditions::createCondition() later decodes and merges the JSON string in condition.config without re-running cleanseConfig() on the decoded configuration. Because condition.config is a JSON string during the first cleanse, Yii special config keys such as &amp;#39;as ...&amp;#39; and &amp;#39;on ...&amp;#39; can be hidden inside it and, after JSON decoding, are interpreted by Yii as behavior/event configuration during FieldLayout object creation. An attacker with an authenticated control panel session (and a valid CSRF token) can exploit this to execute operating system commands as the PHP/web user.&lt;/p&gt;</description>
      <content:encoded>&lt;p&gt;Craft CMS versions from 4.0.0-RC1 before 4.18.2 and from 5.0.0-RC1 before 5.10.6 contain an authenticated remote code execution vulnerability in the control panel element-search condition handling. Craft cleanses the outer request-controlled condition array via Component::cleanseConfig(), but Conditions::createCondition() later decodes and merges the JSON string in condition.config without re-running cleanseConfig() on the decoded configuration. Because condition.config is a JSON string during the first cleanse, Yii special config keys such as &amp;#39;as ...&amp;#39; and &amp;#39;on ...&amp;#39; can be hidden inside it and, after JSON decoding, are interpreted by Yii as behavior/event configuration during FieldLayout object creation. An attacker with an authenticated control panel session (and a valid CSRF token) can exploit this to execute operating system commands as the PHP/web user.&lt;/p&gt;</content:encoded>
      <guid isPermaLink="false">https://vulnerability.circl.lu/vuln/fkie_cve-2026-72778</guid>
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      <title>GHSA-265m-7826-wjqm — Craft CMS: Authenticated RCE via `condition.config` JSON cleanse bypass</title>
      <link>https://vulnerability.circl.lu/vuln/ghsa-265m-7826-wjqm</link>
      <description>&lt;p&gt;&lt;strong&gt;Affected:&lt;/strong&gt; Packagist: craftcms/cms&lt;/p&gt;
&lt;p&gt;Craft CMS has an authenticated remote code execution issue in the control panel element-search condition handling.&lt;/p&gt;
&lt;p&gt;Craft cleans the outer request-controlled condition array with `Component::cleanseConfig()`, but `Conditions::createCondition()` later decodes and merges the JSON string in `condition.config` without re-running `cleanseConfig()` on the decoded/merged configuration.&lt;/p&gt;
&lt;p&gt;Because `condition.config` is a JSON string during the first cleanse, Yii special config keys such as `as` ... and `on` ... can be hidden inside it. After JSON decoding, those keys reach FieldLayout object creation and are interpreted by Yii as behavior/event configuration.&lt;/p&gt;
&lt;p&gt;The RCE is semi-blind: the trigger endpoint returns a normal JSON response, and the command output is verified via a server-side file-write side effect retrieved in a subsequent request.&lt;/p&gt;
&lt;p&gt;## Preconditions&lt;/p&gt;
&lt;p&gt;- The attacker needs an authenticated Craft control panel session.
- A valid CSRF token is required.&lt;/p&gt;
&lt;p&gt;## Impact&lt;/p&gt;
&lt;p&gt;An authenticated control panel user can inject Yii behavior/event configuration after Craft’s intended config cleanse boundary. In the confirmed local lab, this led to command execution as the PHP/web user.&lt;/p&gt;
&lt;p&gt;Potential attacker impact:
- Execute operating system commands as the PHP/web user.
- Read Craft secrets, environment variables, and application configuration.
- Access database credentials and stored site content.
- Modify site content, users, and application state.
- Pivot to internal services reachable from t…&lt;/p&gt;</description>
      <content:encoded>&lt;p&gt;&lt;strong&gt;Affected:&lt;/strong&gt; Packagist: craftcms/cms&lt;/p&gt;
&lt;p&gt;Craft CMS has an authenticated remote code execution issue in the control panel element-search condition handling.&lt;/p&gt;
&lt;p&gt;Craft cleans the outer request-controlled condition array with `Component::cleanseConfig()`, but `Conditions::createCondition()` later decodes and merges the JSON string in `condition.config` without re-running `cleanseConfig()` on the decoded/merged configuration.&lt;/p&gt;
&lt;p&gt;Because `condition.config` is a JSON string during the first cleanse, Yii special config keys such as `as` ... and `on` ... can be hidden inside it. After JSON decoding, those keys reach FieldLayout object creation and are interpreted by Yii as behavior/event configuration.&lt;/p&gt;
&lt;p&gt;The RCE is semi-blind: the trigger endpoint returns a normal JSON response, and the command output is verified via a server-side file-write side effect retrieved in a subsequent request.&lt;/p&gt;
&lt;p&gt;## Preconditions&lt;/p&gt;
&lt;p&gt;- The attacker needs an authenticated Craft control panel session.
- A valid CSRF token is required.&lt;/p&gt;
&lt;p&gt;## Impact&lt;/p&gt;
&lt;p&gt;An authenticated control panel user can inject Yii behavior/event configuration after Craft’s intended config cleanse boundary. In the confirmed local lab, this led to command execution as the PHP/web user.&lt;/p&gt;
&lt;p&gt;Potential attacker impact:
- Execute operating system commands as the PHP/web user.
- Read Craft secrets, environment variables, and application configuration.
- Access database credentials and stored site content.
- Modify site content, users, and application state.
- Pivot to internal services reachable from t…&lt;/p&gt;</content:encoded>
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