CVE-2026-29179 October: Editor Sub-Permission Bypass for Asset and Blueprint File Operations
Users with editor access but missing specific sub-permissions can modify or view theme assets and blueprint files in October CMS.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-29179?
CVE-2026-29179 is a low-severity missing authorization vulnerability in octobercms october, published on 21 Apr 2026. An attacker needs administrator access to exploit it, with no action from the victim.
Official description
October is a Content Management System (CMS) and web platform. Prior to 3.7.16 and 4.1.16, fine-grained sub-permission checks for asset and blueprint file operations were not enforced in the CMS and Tailor editor extensions. This only affects backend users who were explicitly granted editor access but had editor.cms_assets or editor.tailor_blueprints specifically withheld, an uncommon permission configuration. In this edge case, such users could perform file operations (create, delete, rename, move, upload) on theme assets or blueprint files despite lacking the required sub-permission. A related operator precedence error in the Tailor navigation also disclosed the theme blueprint directory tree under the same conditions. This vulnerability is fixed in 3.7.16 and 4.1.16.
Weakness: CWE-863
Which versions are affected by CVE-2026-29179?
4 open source packages ship an affected version, including october/system.
| Package | Affected | Fixed in |
|---|---|---|
october/system Packagist | All versions | 3.7.16 |
october/system Packagist | All versions | 3.7.16 |
october/system Packagist | From 4.0.0 | 4.1.16 |
october/system Packagist | From 4.0.0 | 4.1.16 |
How do I fix CVE-2026-29179?
Upgrade october/system to a fixed version for your release line: 3.7.16 or 4.1.16.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-29179 being exploited?
There is no known exploitation of CVE-2026-29179 in the wild and no public exploit code.
Sources
Also known as GHSA-jvwg-phxx-j3rp.