CVEvulnerability
CVE-2020-28042
5.3 MEDIUM
Official page ↗
- Status
- Modified
- Published
- 2020-11-02
- Last modified
- 2026-06-17
- Assigner
- [email protected]
- CVSS 3.1 ([email protected])
- 5.3 MEDIUM — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
- CVSS 2.0 ([email protected])
- 5.0 MEDIUM — AV:N/AC:L/Au:N/C:N/I:P/A:N
- Weaknesses
- CWE-347
Description
ServiceStack before 5.9.2 mishandles JWT signature verification unless an application has a custom ValidateToken function that establishes a valid minimum length for a signature.
Affected configurations
• servicestack servicestack (< 5.9.2)
Related
Weakness · CWE (1)
- CWE-347 Improper Verification of Cryptographic Signature weakness
References
- https://forums.servicestack.net/t/servicestack-v5-9-2-released/8850 Release Notes, Vendor Advisory
- https://github.com/ServiceStack/ServiceStack/commit/540d4060e877a03ae95343c1a8560a26768585ee Patch, Third Party Advisory
- https://www.shielder.it/advisories/servicestack-jwt-signature-verification-bypass/ Exploit, Third Party Advisory
- https://www.shielder.it/blog/2020/11/re-discovering-a-jwt-authentication-bypass-in-servicestack/ Exploit, Third Party Advisory
- https://forums.servicestack.net/t/servicestack-v5-9-2-released/8850 Release Notes, Vendor Advisory
- https://github.com/ServiceStack/ServiceStack/commit/540d4060e877a03ae95343c1a8560a26768585ee Patch, Third Party Advisory
- https://www.shielder.it/advisories/servicestack-jwt-signature-verification-bypass/ Exploit, Third Party Advisory
- https://www.shielder.it/blog/2020/11/re-discovering-a-jwt-authentication-bypass-in-servicestack/ Exploit, Third Party Advisory