Vulnerability in Seriawei Zkeacms
CVE-2026-111633
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.6 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:L.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
- hackmd.io/@hieuPenguinnn/zkeacms-hardcoded-jwt-signing-key-admin-auth-bypass (third-party-advisory)
- github.com/SeriaWei/ZKEACMS/blob/v4.4/src/ZKEACMS/Api/JwtBearerDefaults.cs (technical-description)
- github.com/SeriaWei/ZKEACMS/blob/v4.4/src/ZKEACMS/BuilderAuthentication.cs (technical-description)
- github.com/SeriaWei/ZKEACMS/issues/531 (issue-tracking)
- www.vulncheck.com/advisories/zkeacms-through-4.4-authentication-bypass-via-hard… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-111633?
- CVE-2026-111633 is a high-severity vulnerability in Seriawei Zkeacms, classified under Use of Hard-coded Cryptographic Key. CVSS score: 8.6/10. Published 2026-10-16.
- How severe is CVE-2026-111633?
- High severity. CVSS v3 base score is 8.6 out of 10.