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CVE-2026-2717— HTTP Headers <= 1.19.2 - Authenticated (Administrator+) CRLF Injection via Custom Header Values

Quick assessment

Affected
zinoui HTTP Headers
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.

WordPress和WordPress plugin都是WordPress基金会的产品。WordPress是一套使用PHP语言开发的博客平台。该平台具有在基于PHP和MySQL的服务器上架设个人博客网站的功能。WordPress plugin是一个应用插件。 WordPress plugin HTTP Headers 1.19.2及之前版本存在注入漏洞，该漏洞源于自定义标头名称和值字段在写入Apache .htaccess文件前清理不足，可能导致具有管理员及以上权限的认证攻击者注入任意换行符和Apache

CVSS 5.5 · Medium EPSS 0.56% · P45

Possible ATT&CK Techniques 1 AI

T1505.003 · Web Shell
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I. Basic Information for CVE-2026-2717

Vulnerability Information
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Vulnerability Title
HTTP Headers <= 1.19.2 - Authenticated (Administrator+) CRLF Injection via Custom Header Values
Source: CVE Program / CVE List V5
Vulnerability Description
The HTTP Headers plugin for WordPress is vulnerable to CRLF Injection in all versions up to, and including, 1.19.2. This is due to insufficient sanitization of custom header name and value fields before writing them to the Apache .htaccess file via `insert_with_markers()`. This makes it possible for authenticated attackers, with Administrator-level access and above, to inject arbitrary newline characters and additional Apache directives into the .htaccess configuration file via the 'Custom Headers' settings, leading to Apache configuration parse errors and potential site-wide denial of service.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:L/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
对CRLF序列的转义处理不恰当(CRLF注入)
Source: CVE Program / CVE List V5
Vulnerability Title
WordPress plugin HTTP Headers 注入漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
WordPress和WordPress plugin都是WordPress基金会的产品。WordPress是一套使用PHP语言开发的博客平台。该平台具有在基于PHP和MySQL的服务器上架设个人博客网站的功能。WordPress plugin是一个应用插件。 WordPress plugin HTTP Headers 1.19.2及之前版本存在注入漏洞，该漏洞源于自定义标头名称和值字段在写入Apache .htaccess文件前清理不足，可能导致具有管理员及以上权限的认证攻击者注入任意换行符和Apache
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
zinoui HTTP Headers 0 ~ 1.19.2 -

II. Public POCs for CVE-2026-2717

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III. Intelligence Information for CVE-2026-2717

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Same Patch Batch · zinoui · 2026-04-22 · 3 CVEs total

CVE-2026-4132 7.2 HIGH HTTP Headers <= 1.19.2 - Authenticated (Administrator+) External Control of File Name or P
CVE-2026-1379 4.4 MEDIUM HTTP Headers <= 1.19.2 - Authenticated (Administrator+) Stored Cross-Site Scripting via 'C

IV. Related Vulnerabilities

Same product: HTTP Headers
Same vendor: zinoui
Same weakness: CWE-93

V. Comments for CVE-2026-2717

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