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Medium · 4.9 CVE-2026-26067 EUVD-2026-24153GHSA-3888-q23f-x7qh

October: Safe Mode Bypass via CSS Preprocessor Compilers

Published Apr 21, 2026 · Updated Apr 21, 2026 · Assigned by GitHub_M

Description

October is a Content Management System (CMS) and web platform. Prior to 3.7.14 and 4.1.10, a server-side information disclosure vulnerability was identified in the handling of CSS preprocessor files. Backend users with Editor permissions could craft .less, .sass, or .scss files that leverage the compiler's import functionality to read arbitrary files from the server. This worked even with cms.safe_mode enabled. This vulnerability is fixed in 3.7.14 and 4.1.10.

Affected products

VendorProductAffectedFixed
octobercms october >= 4.0.0, < 4.1.10, < 3.7.14 —

Affected packages

EcosystemPackageAffectedFixedRecord
Packagist october/system < 3.7.14 3.7.14 GHSA-3888-q23f-x7qh
Packagist october/system >= 4.0.0, < 4.1.10 4.1.10 GHSA-3888-q23f-x7qh

References