CVE-2026-26067

MEDIUM

October: Safe Mode Bypass via CSS Preprocessor Compilers

Title source: cna
STIX 2.1

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.

References (1)

Scores

CVSS v3 4.9
EPSS 0.0005
EPSS Percentile 15.1%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N

CISA SSVC

Vulnrichment
Exploitation none
Automatable no
Technical Impact partial

Details

CWE
CWE-184 CWE-863
Status published
Products (3)
october/system 0 - 3.7.14Packagist
octobercms/october < 3.7.14
octobercms/october >= 4.0.0, < 4.1.10
Published Apr 21, 2026
Tracked Since Apr 21, 2026