CVE-2026-26067CWE-184CWE-863

October: Safe Mode Bypass via CSS Preprocessor Compilers

Medium · published April 21, 2026

CVSS v3.1
4.9
EPSS
0%
Percentile
34.9
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
4.9 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N
CVSS v4.0
Not supplied
EPSS
0.00417 · 34.9th percentile
Weaknesses
CWE-184 · Incomplete List of Disallowed Inputs; CWE-863 · Incorrect Authorization
Published
2026-04-21T16:16Z
EPSS history
Timeline
  • 21 APR 16:16Z
    October: Safe Mode Bypass via CSS Preprocessor Compilers
    cvelistv5