Vulnerability · Published Jun 5, 2026 · Assigned by GitHub_M

CVE-2026-46391HAX open-apis: Credential Theft via Server-Side Request Forgery (SSRF) in open-apis

High 8.7

In plain English

A high-severity server-side request forgery in @haxtheweb/open-apis from haxtheweb. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 40% of all known vulnerabilities). Ready-made attack tooling exists: public proof-of-concept code. Fixed versions are available - upgrade the affected package.

Severity (CVSS 4.0)8.7High

Exploit odds (30 days)0.5%top 60.2% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack tooling1Public PoC

Official description

HAX CMS helps manage microsite universe with PHP or NodeJs backends. Starting in version 9.0.1 and prior to version 26.0.0 of @haxtheweb/open-apis, multiple functions conduct substring-only matching to validate hostnames to which basic authorization should be sent. An attacker can append the matched substrings to an attacker-controlled endpoint and capture authentication. Version 26.0.0 fixes the issue.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
npm	@haxtheweb/open-apis	26.0.0	GHSA-4fg7-f244-3j49

Affected products (as reported)

Vendor	Product	Versions
haxtheweb	@haxtheweb/open-apis	>= 9.0.1, < 26.0.0

Weakness: CWE-183, CWE-918 · Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:L/SI:N/SA:N

References

https://github.com/haxtheweb/issues/security/advisories/GHSA-4fg7-f244-3j49 x_refsource_CONFIRM