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CVE-2026-46399 haxtheweb CVE debrief

CVE-2026-46399 is a critical vulnerability in HAX CMS, a microsite universe management system. The PHP version of HAX CMS prior to version 26.0.0 has an authenticated file overwrite vulnerability. An attacker can exploit this vulnerability to configure malicious Git filter commands and achieve code execution on the HAX CMS server. Version 26.0.0 patches the issue.

Vendor
haxtheweb
Product
haxcms-nodejs
CVSS
CRITICAL 9.4
CISA KEV
Not listed in stored evidence
Original CVE published
2026-06-05
Original CVE updated
2026-06-08
Advisory published
2026-06-05
Advisory updated
2026-06-08

Who should care

Users of HAX CMS, especially those using the PHP version prior to version 26.0.0, should be aware of this vulnerability and take immediate action to patch their systems.

Technical summary

The vulnerability has a CVSS score of 9.4 and is classified as CRITICAL. It allows an attacker to overwrite files on the HAX CMS server, potentially leading to code execution.

Defensive priority

High

Recommended defensive actions

  • Upgrade to version 26.0.0 or later of HAX CMS
  • Review and restrict file overwrite permissions
  • Monitor for suspicious activity on the HAX CMS server

Evidence notes

The vulnerability is confirmed by the CVE record and NVD detail pages. [resourceLinkAnnotations:cve-org,nvd]

Sources and references

Verified primary and authoritative sources

  • CVE-2026-46399 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-46399

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

  • CVE-2026-46399 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-46399

    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.