What’s Vulnerable › Vulnerabilities

CVE-2026-46400: HAXCMS PHP has a File Upload Validation Bypass

• Severity: high (CVSS 8.7 v4.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-06-05 · updated 2026-07-23
• Weakness: CWE-434

Description

HAX CMS helps manage microsite universe with PHP or NodeJs backends. Starting in version 11.0.6 and prior to version 25.0.0, the file upload functionality in HAXCMS PHP only validates file extensions using a regex pattern without checking the actual file content or MIME type. This allows attackers to upload malicious files (e.g., PHP webshells) disguised as legitimate image files, potentially leading to remote code execution. Version 25.0.0 contains a fix for the issue.

Affected products

• haxtheweb haxcms-php: from 11.0.6, < 25.0.0

References

• https://github.com/haxtheweb/issues/security/advisories/GHSA-ffxv-9qv2-v2v8
• https://github.com/haxtheweb/issues/security/advisories/GHSA-ffxv-9qv2-v2v8

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