CVE-2026-26067 — October: Safe Mode Bypass via CSS Preprocessor Compilers

CVE-2026-26067

October: Safe Mode Bypass via CSS Preprocessor Compilers PUBLISHED

Description (CNA)

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 (CNA)

Vendor / product	Versions
octobercms / october	affected >= 4.0.0, < 4.1.10; affected < 3.7.14

CWE

CWE-863, CWE-184

References

https://github.com/octobercms/october/security/advisories/GHSA-3888-q23f-x7qh

ADP enrichment

CISA-ADP

No English description supplied.

No references supplied.