CVE-2026-46395Public exploitNetwork attack vector

Administrator access via exposed HMAC signing key

Published Jun 5, 2026 · Updated Jun 5, 2026

Key disclosure in HAXcms (NodeJS) before 26.0.0 allows remote attackers to forge administrator JWTs via an unauthenticated API. The hmacBase64() function keys HMAC-SHA256 with literal 0, appends privateKey+salt to the digest, and Base64-encodes the combined buffer. The unauthenticated /system/api/connectionSettings endpoint returns these tokens, exposing the signing secret for full site administration.

CVSS severity9.3
Critical
EPSS probability0.29%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Key disclosure in HAXcms (NodeJS) before 26.0.0 allows remote attackers to forge administrator JWTs via an unauthenticated API. The hmacBase64() function keys HMAC-SHA256 with literal 0, appends privateKey+salt to the digest, and Base64-encodes the combined buffer. The unauthenticated /system/api/connectionSettings endpoint returns these tokens, exposing the signing secret for full site administration.

The record

CVE
CVE-2026-46395
Published
Jun 5, 2026
Updated
Jun 5, 2026
Vendor
HAXTheWeb
Product
HAXcms (NodeJS)
Classifications
CWE-200, CWE-321, CWE-327, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 5, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 5, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 26.0.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

HAXTheWeb · HAXcms (NodeJS)version=< 26.0.0

Published CVSS scores

9.3GitHub, Inc.CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-200Exposure of Sensitive Information to an Unauthorized Actor
CWE-321Use of Hard-coded Cryptographic Key
CWE-327Use of a Broken or Risky Cryptographic Algorithm
T1190Exploit Public-Facing Application

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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