How severe is CVE-2026-46399?

CVE-2026-46399 has a CVSS 4.0 base score of 9.4, rated critical severity.

Is CVE-2026-46399 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (21st percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2026-46399?

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

Does CVE-2026-46399 have an EU (EUVD) identifier?

Yes. CVE-2026-46399 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-34880.

When was CVE-2026-46399 published?

CVE-2026-46399 was published on 2026-06-05 and last updated on 2026-06-17.

CVE-2026-46399

CVE-2026-46399 is a critical-severity vulnerability with a CVSS 4.0 base score of 9.4. 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-15.

Key facts

Severity: Critical (CVSS 4.0 base score 9.4)
EPSS exploit prediction: 0% (21st percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-34880
Weakness: CWE-15
Published: 2026-06-05
Last modified: 2026-06-17

Description

HAX CMS helps manage microsite universe with PHP or NodeJs backends. 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.

Frequently asked questions

What is CVE-2026-46399?: HAX CMS helps manage microsite universe with PHP or NodeJs backends. 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.
How severe is CVE-2026-46399?: CVE-2026-46399 has a CVSS 4.0 base score of 9.4, rated critical severity.
Is CVE-2026-46399 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (21st percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2026-46399?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
Does CVE-2026-46399 have an EU (EUVD) identifier?: Yes. CVE-2026-46399 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-34880.
When was CVE-2026-46399 published?: CVE-2026-46399 was published on 2026-06-05 and last updated on 2026-06-17.

References

https://github.com/haxtheweb/issues/security/advisories/GHSA-q759-vxg8-vq5j

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