CVE-2026-46392— HAX CMS PHP Has a Stored XSS via Case-Sensitivity Mismatch in HTML Upload Validation
Possible ATT&CK Techniques 3AI
T1059 · Command and Scripting Interpreter T1189 · Drive-by Compromise T1505.003 · Web ShellAffected Version Matrix 1
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| 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: NVD (National Vulnerability Database)
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: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N
Source: NVD (National Vulnerability Database)
Vulnerability Type
大小写敏感处理不恰当
Source: NVD (National Vulnerability Database)
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 POCVerified env Premium
Qwen3.6-35B-A3B · 9819 chars
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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
- CVE-2026-46493
haxtheweb/haxcms-php uses insecure method for generating sal - CVE-2026-46400
HAXCMS PHP has a File Upload Validation Bypass - CVE-2026-46398
HAX CMS Missing Secure Flag on Cookie - CVE-2026-46397
haxcms-php Local File Inclusion via saveOutline API Location - CVE-2026-46394
HAX CMS Vulnerable to Command Injection using Git.php
Same vendor: haxtheweb
- CVE-2026-46357
HAX CMS NodeJS application Vulnerable to Denial of Service u - CVE-2026-46493
haxtheweb/haxcms-php uses insecure method for generating sal - CVE-2026-46401
HAX CMS PHP has Insufficient Session Expiration - CVE-2026-46400
HAXCMS PHP has a File Upload Validation Bypass - CVE-2026-46398
HAX CMS Missing Secure Flag on Cookie
Same weakness: CWE-178
- CVE-2026-14617
NousResearch hermes-agent Streaming Reasoning Tag Filter str - CVE-2026-58057
Flowise - Custom MCP Environment Variable Denylist Bypass vi - CVE-2026-57234
Nokogiri: XML::Schema on JRuby allows network requests when - CVE-2026-48794
Authelia has an Edge Case Access Control Rule Mismatch - CVE-2026-47203
Authelia Missing Username Canonicalization in Basic Auth (LD
V. Comments for CVE-2026-46392
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