HAX CMS NodeJS application Vulnerable to Denial of Service using Malicious Import Request

published 2026-05-19 5 mo ago modified 2026-09-10 1 mo ago also EUVD-2026-34897 , GHSA-9r33-xhw8-4qqp

cvss: 6.5; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.2%; EPSS 0.2% chance of exploitation in 30 days, percentile 15%
public exploits: 0; none known

HAX CMS helps manage microsite universe with PHP or NodeJs backends. Prior to version 26.0.0, the HAX CMS NodeJS application crashes when an authenticated attacker sends a specially crafted site creation request to the createSite endpoint. A single request is sufficient to take the entire application offline, requiring a manual server restart to restore service. Version 26.0.0 fixes the issue.

Patch / fix

fixed in 2

npm @haxtheweb/haxcms-nodejs 26.0.0
haxtheweb haxcms-nodejs 26.0.0

CISA SSVC

Exploitation: Proof of concept is public
Automatable: no
Technical impact: partial
Assessed: 5 mo ago (2026-06-09)

Exploit prediction

0.24% chance of exploitation in the next 30 days, higher than 15% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

github.com https://github.com/haxtheweb/issues/security/advisories/GHSA-9r33-xhw8-4qqp referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by	version	score	vector
CNA	3.1	6.5	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
GitHub	3.1	6.5	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Affected packages

ecosystem	package	affected	fixed in
npm	@haxtheweb/haxcms-nodejs	<26.0.0	26.0.0

Affected products

haxtheweb haxcms-nodejs

Classification

Weakness

CWE-20 Improper Input Validation
CWE-476 NULL Pointer Dereference

References

github.com /haxtheweb/issues/security/advisories/GHSA-9r33-xhw8-4qqp
exploit, web
nvd.nist.gov /vuln/detail/CVE-2026-46357
advisory
github.com /haxtheweb/issues
package

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.

Summary