---
id: CVE-2026-111633
title: ZKEACMS through 4.4 Authentication Bypass via Hard-Coded JWT Signing Key
summary: >-
  ZKEACMS through 4.4 contains an authentication bypass vulnerability that
  allows unauthenticated attackers to forge REST API JWT bearer tokens using a
  hard-coded HMAC-SHA256 signing key in JwtBearerDefaults.cs. Attackers can sign
  a token …
severity: high
cvss: 8.6
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:L'
cvssSource: cna
cwe:
  - CWE-321
vendor: SeriaWei
product: ZKEACMS
affected:
  - ZKEACMS <= 4.4
published: '2026-10-16'
updated: '2026-10-16'
sourceUpdated: '2026-10-16T17:39:06.226Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-111633'
references:
  - url: >-
      https://hackmd.io/@hieuPenguinnn/zkeacms-hardcoded-jwt-signing-key-admin-auth-bypass
  - url: >-
      https://github.com/SeriaWei/ZKEACMS/blob/v4.4/src/ZKEACMS/Api/JwtBearerDefaults.cs#L14-L19
  - url: >-
      https://github.com/SeriaWei/ZKEACMS/blob/v4.4/src/ZKEACMS/BuilderAuthentication.cs#L41-L52
  - url: 'https://github.com/SeriaWei/ZKEACMS/issues/531'
  - url: >-
      https://www.vulncheck.com/advisories/zkeacms-through-4.4-authentication-bypass-via-hard-coded-jwt-signing-key
    label: >-
      VulnCheck Advisory: ZKEACMS through 4.4 Authentication Bypass via
      Hard-Coded JWT Signing Key
tags:
  - cve.org
ingestedAt: '2026-10-16T18:43:08.686Z'
---

## Overview

ZKEACMS through 4.4 contains an authentication bypass vulnerability that allows unauthenticated attackers to forge REST API JWT bearer tokens using a hard-coded HMAC-SHA256 signing key in JwtBearerDefaults.cs. Attackers can sign a token with the Name claim set to 'admin' to call ApiAuthorize endpoints, modifying articles and products and reading form submissions.

## Affected

- `ZKEACMS <= 4.4`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.