Vulnerability · Published Apr 21, 2026 · Assigned by GitHub_M

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

Low 3.3

In plain English

A low-severity incorrect authorization in october from octobercms. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.1% (higher than 4% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)3.3Low

Exploit odds (30 days)0.1%top 96.3% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

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.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
Packagist	october/system	4.1.16	GHSA-jvwg-phxx-j3rp
Packagist	october/system	3.7.16	GHSA-jvwg-phxx-j3rp

Affected products (as reported)

Vendor	Product	Versions
octobercms	october	>= 4.0.0, < 4.1.16< 3.7.16

Weakness: CWE-863 · Vector: CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:L/I:L/A:N

References

https://github.com/octobercms/october/security/advisories/GHSA-jvwg-phxx-j3rp x_refsource_CONFIRM