CVE-2026-26067 — October: Safe Mode Bypass via CSS Preprocessor Compilers
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 C…
Published: 2026-04-21 · CVSS: 4.9 · CVSS 3.1
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.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7