CVE-2021-21265— October CMS vulnerable to Potential Host Header Poisoning on misconfigured servers
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I. Basic Information for CVE-2021-21265
Vulnerability Information
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Vulnerability Title
October CMS vulnerable to Potential Host Header Poisoning on misconfigured servers
Source: NVD (National Vulnerability Database)
Vulnerability Description
October is a free, open-source, self-hosted CMS platform based on the Laravel PHP Framework. In October before version 1.1.2, when running on poorly configured servers (i.e. the server routes any request, regardless of the HOST header to an October CMS instance) the potential exists for Host Header Poisoning attacks to succeed. This has been addressed in version 1.1.2 by adding a feature to allow a set of trusted hosts to be specified in the application. As a workaround one may set the configuration setting cms.linkPolicy to force.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:H/A:N
Source: NVD (National Vulnerability Database)
Vulnerability Type
对HTTP头部进行脚本语法转义处理不恰当
Source: NVD (National Vulnerability Database)
Vulnerability Title
October CMS 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
October CMS是一套基于PHP和Laravel Web应用程序框架的开源内容管理系统（CMS）。 October before version 1.1.2 存在安全漏洞，该漏洞源于当运行在配置错误的服务器上时，主机头攻击可能会成功。
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 | < 1.1.2 | - |
II. Public POCs for CVE-2021-21265
| # | POC Description | Source Link | Shenlong Link |
|---|
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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-2026-26067
October: Safe Mode Bypass via CSS Preprocessor Compilers - CVE-2026-25133
October CMS has Stored XSS via SVG Filter Bypass
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-2026-26067
October: Safe Mode Bypass via CSS Preprocessor Compilers - CVE-2026-25133
October CMS has Stored XSS via SVG Filter Bypass
Same weakness: CWE-644
- CVE-2026-33805
@fastify/reply-from vulnerable to connection header abuse en - CVE-2025-66485
Multiple vulnerabilities have been addressed in IBM Aspera S - CVE-2026-33149
Tandoor Recipes Vulnerable to Host Header Injection - CVE-2025-14807
IBM InfoSphere Information Server is vulnerable to HTTP head - CVE-2025-13213
Multiple vulnerabilities in IBM Aspera Orchestrator
V. Comments for CVE-2021-21265
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