How severe is CVE-2026-46400?

CVE-2026-46400 has a CVSS 4.0 base score of 8.7, rated high severity.

Is CVE-2026-46400 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (31st percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2026-46400?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2026-46400 have an EU (EUVD) identifier?

Yes. CVE-2026-46400 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-34894.

When was CVE-2026-46400 published?

CVE-2026-46400 was published on 2026-06-05 and last updated on 2026-06-17.

CVE-2026-46400

CVE-2026-46400 is a high-severity vulnerability with a CVSS 4.0 base score of 8.7. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-434.

Key facts

Severity: High (CVSS 4.0 base score 8.7)
EPSS exploit prediction: 0% (31st percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-34894
Weakness: CWE-434
Published: 2026-06-05
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2026-46400?: 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.
How severe is CVE-2026-46400?: CVE-2026-46400 has a CVSS 4.0 base score of 8.7, rated high severity.
Is CVE-2026-46400 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (31st percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2026-46400?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2026-46400 have an EU (EUVD) identifier?: Yes. CVE-2026-46400 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-34894.
When was CVE-2026-46400 published?: CVE-2026-46400 was published on 2026-06-05 and last updated on 2026-06-17.

References

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

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