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PatchSiren cyber security CVE debrief

CVE-2026-46396 haxtheweb CVE debrief

A stored cross-site scripting (XSS) vulnerability exists in HAX CMS versions prior to 26.0.0. The vulnerability is caused by improper sanitization of `<iframe>` elements, allowing `javascript:` URIs in the `src` attribute. This enables attackers to execute arbitrary JavaScript in the context of the victim's browser and access sensitive data exposed to client-side scripts. The vulnerability has a CVSS score of 9.3 and is considered CRITICAL.

Vendor
haxtheweb
Product
haxcms-nodejs
CVSS
CRITICAL 9.3
CISA KEV
Not listed in stored evidence
Original CVE published
2026-06-05
Original CVE updated
2026-06-09
Advisory published
2026-06-05
Advisory updated
2026-06-09

Who should care

Users of HAX CMS versions prior to 26.0.0 should update to version 26.0.0 or later to fix the issue.

Technical summary

The application allows `javascript:` URIs in the `src` attribute of `<iframe>` elements, which are executed when a malicious page is viewed. This enables attackers to execute arbitrary JavaScript in the context of the victim's browser and access sensitive data exposed to client-side scripts.

Defensive priority

HIGH

Recommended defensive actions

  • Update to version 26.0.0 or later

Evidence notes

The vulnerability is fixed in version 26.0.0.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-46396 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-46396

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

  • CVE-2026-46396 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-46396

    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.