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CVE-2026-46392— HAX CMS PHP Has a Stored XSS via Case-Sensitivity Mismatch in HTML Upload Validation

Quick assessment

Affected
haxtheweb haxcms-php
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

HAX是HAX The Web开源的一个HAX+CMS使用PHP后端管理的微型网站。 HAX 26.0.0之前版本存在安全漏洞，该漏洞源于saveFile端点验证上传扩展名不区分大小写但.htaccess规则区分大小写，可能导致上传大写扩展名的HTML文件绕过强制下载头并在浏览器中内联渲染执行JavaScript。

CVSS 8.7 · High EPSS 0.37% · P29

Affected Version Matrix 1

VendorProduct Version RangeStatus
haxtheweb haxcms-php < 26.0.0 affected
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I. Basic Information for CVE-2026-46392

Vulnerability Information
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Vulnerability Title
HAX CMS PHP Has a Stored XSS via Case-Sensitivity Mismatch in HTML Upload Validation
Source: CVE Program / CVE List V5
Vulnerability Description
HAX CMS helps manage microsite universe with PHP or NodeJs backends. Prior to version 26.0.0 of HAX CMS PHP, the `saveFile` endpoint validates upload extensions case-insensitively and writes the filename to disk verbatim, but the `.htaccess` rule that forces `Content-Disposition: attachment` on HTML files is case-sensitive. An HTML file uploaded with an uppercase extension (`.HTML`, `.Html`, `.HTM`) is still served as `text/html` but the forced-download header never applies, so the browser renders it inline and executes any embedded JavaScript in the HAXcms origin. This bypasses the mitigation shipped for CVE-2026-22704. Version 26.0.0 contains a fix.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
大小写敏感处理不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
HAX 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
HAX是HAX The Web开源的一个HAX+CMS使用PHP后端管理的微型网站。 HAX 26.0.0之前版本存在安全漏洞，该漏洞源于saveFile端点验证上传扩展名不区分大小写但.htaccess规则区分大小写，可能导致上传大写扩展名的HTML文件绕过强制下载头并在浏览器中内联渲染执行JavaScript。
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
haxtheweb haxcms-php < 26.0.0 -

II. Public POCs for CVE-2026-46392

# POC Description Source Link Shenlong Link
AI-Generated POC Verified env Premium
Qwen3.6-35B-A3B · 9819 chars
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Vulnerability reproduction recording (real sandbox build + trigger, exclusive)
In-depth vulnerability mechanism
Trigger conditions & impact
Full executable POC code
Exploit chain & mitigation
POC zip download
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III. Intelligence Information for CVE-2026-46392

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Vendor Advisories for CVE-2026-46392 (1)

Same Patch Batch · haxtheweb · 2026-06-05 · 16 CVEs total

CVE-2026-46493 7.5 HIGH haxtheweb/haxcms-php uses insecure method for generating salt
CVE-2026-46357 6.5 MEDIUM HAX CMS NodeJS application Vulnerable to Denial of Service using Malicious Import Request
CVE-2026-46397 6.5 MEDIUM haxcms-php Local File Inclusion via saveOutline API Location Parameter v2.0
CVE-2026-46396 HAX CMS has a stored XSS via <iframe> that allows access to sensitive client-side data and
CVE-2026-46401 HAX CMS PHP has Insufficient Session Expiration
CVE-2026-46390 HAX CMS has Unauthenticated Git Access via User-Controlled Key
CVE-2026-46394 HAX CMS Vulnerable to Command Injection using Git.php
CVE-2026-46496 HAX CMS: Stored XSS via '<video-player>' component allows arbitrary JavaScript execution a
CVE-2026-46398 HAX CMS Missing Secure Flag on Cookie
CVE-2026-46395 HAX CMS Vulnerable to Private Key Disclosure via Broken HMAC Implementation
CVE-2026-46511 HAXcms: Mass Token Exfiltration and Cross-Tenant Hijack
CVE-2026-46400 HAXCMS PHP has a File Upload Validation Bypass
CVE-2026-46391 HAX open-apis: Credential Theft via Server-Side Request Forgery (SSRF) in open-apis
CVE-2026-46393 HAXcms createSite SSRF Enables Arbitrary File Read
CVE-2026-46399 Authenticated Remote Code Execution via File Overwrite

IV. Related Vulnerabilities

Same product: haxcms-php
Same vendor: haxtheweb
Same weakness: CWE-178

V. Comments for CVE-2026-46392

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