October CMS CVE-2026-26067

| EUVD-2026-24153 MEDIUM
Incorrect Authorization (CWE-863)
2026-04-21 GitHub_M GHSA-3888-q23f-x7qh
Authentication Bypass Information Disclosure
4.9
CVSS 3.1
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CVSS VectorNVD

CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N
Attack Vector
Network
Attack Complexity
Low
Privileges Required
High
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
None

Lifecycle Timeline

2
Patch available
Apr 21, 2026 - 18:01 EUVD
Analysis Generated
Apr 21, 2026 - 17:00 vuln.today

DescriptionNVD

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.

AnalysisAI

October CMS versions prior to 3.7.14 and 4.1.10 allow authenticated backend users with Editor permissions to read arbitrary server files by crafting malicious CSS preprocessor files (.less, .sass, .scss) that exploit the compiler's import functionality. The vulnerability persists even when cms.safe_mode is enabled, enabling high-confidence information disclosure of sensitive configuration files, credentials, and application source code without requiring administrative privileges.

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CVE-2026-26067 vulnerability details – vuln.today
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