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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.

GHSA-wv23-pfj7-2mjj — October/System authenticated file write leads to remote code execution

Affected: Packagist: october/system

### 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)

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GHSA-wv23-pfj7-2mjj — October/System authenticated file write leads to remote code execution

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