CVE-2026-46400

HAXCMS PHP has a File Upload Validation Bypass

HIGH

8.7

CVSS Score

Published: June 5, 2026 at 07:15 PM UTC

Updated: July 23, 2026 at 07:35 AM UTC

1 product affected across 1 vendorHaxcms PHP

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Severity

HIGH8.7

Exploit prediction

EPSS 0.4%

SSVC

PoC

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

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Haxcms PHP · Haxtheweb

60%

v < 25.0.0

Affected range stops below 25.0.0, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

References (1)

x_refsource_CONFIRM

Source: cverecord

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

SSVC — Action Prioritization

SSVCPoCNot automatableTotal impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

8.7HIGHGitHub_M

Vector?

Quick Info

StatusDEFERRED

CWE

CWE-434

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