CVSS 3.1
5.3 mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:NCVE-2020-28042
Medium (5.3) in servicestack servicestack. EPSS 2.3% chance of exploitation in the next 30 days.
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.
Severity
- EPSS
- 2.3% chance of exploitation in the next 30 days; higher than 83% of CVEs (scores of 2026-10-31)
- CWE
- CWE-347
- Published
- Modified
- Record from
- the NVD, synced
Affected
- servicestack:servicestack
References
- https://forums.servicestack.net/t/servicestack-v5-9-2-released/8850
- https://github.com/ServiceStack/ServiceStack/commit/540d4060e877a03ae95343c1a8560a26768585ee
- https://www.shielder.it/advisories/servicestack-jwt-signature-verification-bypass/
- https://www.shielder.it/blog/2020/11/re-discovering-a-jwt-authentication-bypass-in-servicestack/
- https://forums.servicestack.net/t/servicestack-v5-9-2-released/8850