CVE-2026-111633
CVE-2026-111633 · ZKEACMS through 4.4 Authentication Bypass via Hard-Coded JWT Signing Key
This page contains facts from public vulnerability sources. Check the original advisory before updating.
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.
CVSS 8.8 · High · EPSS 0.4%
- Published
- Updated
Affected products and versions
zkeacms
- Versions
- ≥ 0, ≤ 4.4: Affected (custom)
No fix published
Original sources
- https://hackmd.io/@hieuPenguinnn/zkeacms-hardcoded-jwt-signing-key-admin-auth-bypass
- https://github.com/SeriaWei/ZKEACMS/blob/v4.4/src/ZKEACMS/Api/JwtBearerDefaults.cs#L14-L19
- https://github.com/SeriaWei/ZKEACMS/blob/v4.4/src/ZKEACMS/BuilderAuthentication.cs#L41-L52
- https://github.com/SeriaWei/ZKEACMS/issues/531
- https://www.vulncheck.com/advisories/zkeacms-through-4.4-authentication-bypass-via-hard-coded-jwt-signing-key
- https://nvd.nist.gov/vuln/detail/CVE-2026-111633