Advisory Weakness Curation

October/System authenticated file write leads to remote code execution ### Impact Assuming an attacker with "create, modify and delete website pages" privileges in the backend is able to execute PHP code by running specially crafted Twig code in the template markup. ### Patches Issue has been patched in Build 473 and v1.1.6 ### Workarounds Apply https://github.com/octobercms/october/commit/167b592eed291ae1563c8fcc5b9b34a03a300f26 to your installation manually if you are unable to upgrade. ### References Credits to: • David Miller ### For more information If you have any questions or comments about this advisory: * Email us at [hello@octobercms.com](mailto:hello@octobercms.com)

Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection') October CMS is a self-hosted content management system (CMS) platform based on the Laravel PHP Framework., an attacker with "create, modify and delete website pages" privileges in the backend is able to execute PHP code by running specially crafted Twig code in the template markup. The issue has been patched in Build (v1.0.473) and v1.1.6. Those unable to upgrade may apply the patch to their installation manually as a workaround.

Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection') October CMS is a self-hosted content management system (CMS) platform based on the Laravel PHP Framework. Prior to versions 1.0.473 and 1.1.6, an attacker with "create, modify and delete website pages" privileges in the backend is able to execute PHP code by running specially crafted Twig code in the template markup. The issue has been patched in Build 473 (v1.0.473) and v1.1.6. Those unable to upgrade may apply the patch to their installation manually as a workaround.