CVE-2026-111633
Received Received - Intake

Authentication Bypass in ZKEACMS via Hard-Coded JWT Key

Publication date: 2026-10-16

Last updated on: 2026-10-16

Assigner: VulnCheck

Description
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.

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Meta Information

Published
2026-10-16
Last Modified
2026-10-16
Generated
2026-10-16
AI Q&A
2026-10-16
EPSS Evaluated
N/A
NVD
CVE-2026-111633
EUVD
EUVD-2026-103055

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
SeriaWei ZKEACMS 0

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-321 The product uses a hard-coded, unchangeable cryptographic key.

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Executive Summary

ZKEACMS through version 4.4 has an authentication bypass flaw. Unauthenticated attackers can forge REST API JWT bearer tokens using a hard-coded HMAC-SHA256 signing key. By signing a token with the Name claim set to 'admin', attackers can gain elevated privileges to call ApiAuthorize endpoints.

Detection Guidance

Detecting this vulnerability requires checking for unauthenticated access to REST API endpoints and verifying JWT token signing keys. Inspect JwtBearerDefaults.cs for hard-coded HMAC-SHA256 keys and test if tokens with Name=admin can bypass authentication.

Impact Analysis

Attackers could modify articles and products, read form submissions, and perform unauthorized actions as an admin. This could lead to data breaches, unauthorized changes to content, and potential loss of sensitive information.

Compliance Impact

This vulnerability could lead to unauthorized access and data exposure, violating GDPR's data protection requirements and HIPAA's security rules. Non-compliance may result in legal penalties, fines, and reputational damage.

Mitigation Strategies

Immediately update ZKEACMS to the latest version beyond 4.4. Remove any hard-coded HMAC-SHA256 keys in JwtBearerDefaults.cs and regenerate all JWT signing keys. Restrict API access to authenticated users only and monitor for unauthorized admin-level actions.

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