CVE-2026-26067— October: Safe Mode Bypass via CSS Preprocessor Compilers
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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: NVD (National Vulnerability Database)
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: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N
Source: NVD (National Vulnerability Database)
Vulnerability Type
授权机制不正确
Source: NVD (National Vulnerability Database)
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
| # | POC Description | Source Link | Shenlong Link |
|---|
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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
- CVE-2026-29179
October: Editor Sub-Permission Bypass for Asset and Blueprin - CVE-2026-27937
October: Reflected XSS via DataTable Form Widget - CVE-2026-26274
October: Safe Mode Bypass via Twig Database Write Operations - CVE-2026-25133
October CMS has Stored XSS via SVG Filter Bypass - CVE-2026-25125
October CMS: Environment Variable Exfiltration via INI Parse
Same vendor: octobercms
- CVE-2026-29179
October: Editor Sub-Permission Bypass for Asset and Blueprin - CVE-2026-27937
October: Reflected XSS via DataTable Form Widget - CVE-2026-26274
October: Safe Mode Bypass via Twig Database Write Operations - CVE-2026-25133
October CMS has Stored XSS via SVG Filter Bypass - CVE-2026-25125
October CMS: Environment Variable Exfiltration via INI Parse
Same weakness: CWE-863
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Privilege Escalation Attack affecting Pelican Web UI - CVE-2025-15633
HCL BigFix WebUI is affected by an improper authorization vu - CVE-2026-42296
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