CVE-2026-46392 (GCVE-0-2026-46392)
Vulnerability from cvelistv5 – Published: 2026-06-05 18:20 – Updated: 2026-06-05 19:11
VLAI
EPSS
VEX
Title
HAX CMS PHP Has a Stored XSS via Case-Sensitivity Mismatch in HTML Upload Validation
Summary
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.
Severity
8.7 (High)
SSVC
Exploitation: poc
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-06-05 19:11 UTC
CWE
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://github.com/haxtheweb/issues/security/advi… | x_refsource_CONFIRM |
Impacted products
1 product
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| haxtheweb | haxcms-php |
Affected:
< 26.0.0
|
guessed |
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Browse all ATT&CK techniques and the vulnerabilities related to each.
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