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CVE-2026-46400 haxtheweb CVE debrief

CVE-2026-46400 is a high-severity vulnerability in HAX CMS, a microsite universe management system. The vulnerability exists in the file upload functionality of HAXCMS PHP, starting from version 11.0.6 and prior to version 25.0.0. The file upload functionality only validates file extensions using a regex pattern without checking the actual file content or MIME type. This allows attackers to upload malicious files, such as PHP webshells, disguised as legitimate image files, potentially leading to remote code execution. The CVSS score for this vulnerability is 8.7, indicating a high severity. The vulnerability was published on [cvePublishedAt] and modified on [cveModifiedAt].

Vendor
haxtheweb
Product
haxcms-php
CVSS
HIGH 8.7
CISA KEV
Not listed in stored evidence
Original CVE published
2026-06-05
Original CVE updated
2026-07-23
Advisory published
2026-06-05
Advisory updated
2026-07-23

Who should care

Users of HAX CMS, particularly those using versions between 11.0.6 and 25.0.0, should be aware of this vulnerability and take steps to mitigate it.

Technical summary

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.

Defensive priority

High

Recommended defensive actions

  • Upgrade to version 25.0.0 or later
  • Implement additional validation and sanitization of file uploads
  • Monitor for suspicious file uploads and system activity

Evidence notes

The vulnerability is described in the CVE record [resourceLinkAnnotations:cve-org] and the NVD detail page [resourceLinkAnnotations:nvd].

Sources and references

Verified primary and authoritative sources

  • CVE-2026-46400 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-46400

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-46400 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-46400

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.