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

Quick assessment

Affected
octobercms october
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

October是October开源的一个内容管理系统 (CMS) 和网络平台。 October 3.7.14之前版本和4.1.10之前版本存在安全漏洞，该漏洞源于CSS预处理器文件处理不当，可能导致具有Editor权限的后端用户读取服务器任意文件。

CVSS 4.9 · Medium EPSS 0.42% · P34

Possible ATT&CK Techniques 1 AI

T1005 · Data from Local System
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I. Basic Information for CVE-2026-26067

Vulnerability Information
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Vulnerability Title
October: Safe Mode Bypass via CSS Preprocessor Compilers
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制不正确
Source: CVE Program / CVE List V5
Vulnerability Title
October 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
October是October开源的一个内容管理系统 (CMS) 和网络平台。 October 3.7.14之前版本和4.1.10之前版本存在安全漏洞，该漏洞源于CSS预处理器文件处理不当，可能导致具有Editor权限的后端用户读取服务器任意文件。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
octobercms october >= 4.0.0, < 4.1.10 -

II. Public POCs for CVE-2026-26067

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III. Intelligence Information for CVE-2026-26067

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Vendor Advisories for CVE-2026-26067 (1)

Same Patch Batch · octobercms · 2026-04-21 · 4 CVEs total

CVE-2026-26274 6.6 MEDIUM October: Safe Mode Bypass via Twig Database Write Operations
CVE-2026-29179 3.3 LOW October: Editor Sub-Permission Bypass for Asset and Blueprint File Operations
CVE-2026-27937 3.1 LOW October: Reflected XSS via DataTable Form Widget

IV. Related Vulnerabilities

Same product: october
Same vendor: octobercms
Same weakness: CWE-863

V. Comments for CVE-2026-26067

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