# CVE-2026-29179: October CMS: Editor Sub-Permission Bypass for Asset and Blueprint File Operations

Source: https://junglewise.ai/threats/cve-2026-29179-october-cms-editor-sub-permission-bypass-for-asset-and-blueprint  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-04-21. Updated: 2026-05-11  
License: CC BY 4.0 with a link back

CVE-2026-29179 · Severity: low · CVSS 3.3 · Published 2026-04-21

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.

Technologies: [october/system (Packagist)](https://junglewise.ai/threats/technologies/october-system). Vendors: [Packagist](https://junglewise.ai/threats/vendors/packagist).

## Quick answers

**Is CVE-2026-29179 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-29179 being exploited in the wild.

**How severe is CVE-2026-29179?** Low severity, with a CVSS score of 3.3, published 21 April 2026.

**Which products and versions are affected?** october/system (Packagist) ECOSYSTEM:introduced=4.0.0,fixed=4.1.16.

**Is there a fix for CVE-2026-29179?** Yes. october/system (Packagist): upgrade to 4.1.16 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**Am I affected by CVE-2026-29179?** Check whether you run october/system (Packagist) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- october/system (Packagist): upgrade to 4.1.16 or later

  ```sh
  composer require october/system:^4.1.16
  ```


## Affected products

- october/system (Packagist) ECOSYSTEM:introduced=4.0.0,fixed=4.1.16

## Identifiers

- CVE-2026-29179
- GHSA-jvwg-phxx-j3rp

## References

- [https://github.com/octobercms/october/security/advisories/GHSA-jvwg-phxx-j3rp](https://github.com/octobercms/october/security/advisories/GHSA-jvwg-phxx-j3rp)
- [https://api.github.com/repos/octobercms/october/security-advisories/GHSA-jvwg-phxx-j3rp](https://api.github.com/repos/octobercms/october/security-advisories/GHSA-jvwg-phxx-j3rp)

## Related threats

- [October CMS PHP object injection in widget session storage](https://junglewise.ai/threats/cve-2026-49400-october-cms-php-object-injection-in-widget-session-storage)
- [October CMS Twig sandbox bypass in Safe Mode](https://junglewise.ai/threats/cve-2026-46696-october-cms-twig-sandbox-bypass-in-safe-mode)
- [October CMS: Reflected XSS via DataTable Form Widget](https://junglewise.ai/threats/cve-2026-27937-october-cms-reflected-xss-via-datatable-form-widget)
- [October CMS has Safe Mode Bypass via CSS Preprocessor Compilers](https://junglewise.ai/threats/cve-2026-26067-october-cms-has-safe-mode-bypass-via-css-preprocessor-compilers)
- [October CMS has Stored XSS in Event Log Mail Preview](https://junglewise.ai/threats/cve-2026-24907-october-cms-has-stored-xss-in-event-log-mail-preview)