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VulnerabilityPublished Updated

CVE-2026-46391: @haxtheweb/open-apis · Permissive List of Allowed Inputs

Affects @haxtheweb/open-apisSource CVE Database V5

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Not known to be exploited · CVSS 8.7 High : upgrade to 26.0.0 soon.

Data as of 30 Oct 2026, 06:59 UTC

CVSS 4.0 base score
8.7High
How severe the flaw is on the 0–10 CVSS scale.
EPSS
0.4% chance of exploitation in 30 days – higher than 39% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch
Available – fixed in 26.0.0
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

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 5 Jun 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: evidence found.

    Public exploit code: GitHub proofs of concept

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), GitHub proofs of concept, the Metasploit, Exploit-DB and nuclei-templates index as of 29 Oct 2026.

What to do

Upgrade @haxtheweb/open-apis to 26.0.0.

Affected software

ProductAffectedFixed in
haxtheweb@haxtheweb/open-apisAffected
  • >=9.0.1 <26.0.0
Fixed in
  • 26.0.0
npm@haxtheweb/open-apispkg:npm/@haxtheweb/open-apisOther threatsAffected
  • >=9.0.1 <26.0.0
Fixed in
  • 26.0.0

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

Upgrade to version 26.0.0 or later of @haxtheweb/open-apis, where the hostname validation issue is fixed. No other official remediation or temporary fix is documented. Patch status is not explicitly confirmed by a vendor advisory, but the version 26.0.0 release is identified as the fix.

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.

References

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