Vulnerability Description
SpringBlade versions from 2.7.3 up to but not including 5.0.0 contain a privilege escalation vulnerability that allows authenticated attackers to create system administrator accounts by sending crafted POST requests to an unprotected internal Feign user-creation endpoint exposed via @RestController without authorization checks. Attackers can exploit the gateway's authentication filter, which only validates JWT parsing without verifying user roles or caller identity, and leverage a hardcoded JWT signing key embedded in publicly available JARs to forge tokens and escalate privileges from a low-privilege user to administrator, enabling cross-tenant data pollution and persistent backdoor access.
CVSS Score
HIGH
Related Weaknesses (CWE)
References
- https://gist.github.com/sud0why/e73405057dd7414a8c221ef17e0d0059#file-cve-2026-5
- https://github.com/chillzhuang/SpringBlade
- https://github.com/chillzhuang/SpringBlade/commit/c69b9547c942c697da2f3ee6a9265b
- https://github.com/chillzhuang/SpringBlade/releases#release-v5.0.0
- https://www.vulncheck.com/advisories/springblade-privilege-escalation-via-expose
FAQ
What is CVE-2026-56100?
CVE-2026-56100 is a vulnerability with a CVSS score of 8.1 (HIGH). SpringBlade versions from 2.7.3 up to but not including 5.0.0 contain a privilege escalation vulnerability that allows authenticated attackers to create system administrator accounts by sending crafte...
How severe is CVE-2026-56100?
CVE-2026-56100 has been rated HIGH with a CVSS base score of 8.1/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-56100?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.