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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.","state":0,"publishedAt":"2026-08-28T18:00:36.953+00:00","modifiedAt":"2026-10-01T15:20:03.258+00:00","affected":[{"ecosystem":"Vendor product","name":"SpringBlade","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"defaultStatus\": \"affected\",\n                    \"vendor\": \"SpringBlade\",\n                    \"product\": \"SpringBlade\",\n                    \"repo\": \"https://gitee.com/smallc/SpringBlade\",\n                    \"versions\": [\n                        {\n                            \"status\": \"affected\",\n                            \"version\": \"2.7.3\",\n                            \"versionType\": \"semver\",\n                            \"lessThan\": \"5.0.0\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 4.0","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N","score":8.6,"severity":"HIGH"},{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N","score":8.1,"severity":"HIGH"}],"references":["https://gist.github.com/sud0why/e73405057dd7414a8c221ef17e0d0059#file-cve-2026-56100-springblade-authbypass-en-md","https://github.com/chillzhuang/SpringBlade/releases#release-v5.0.0","https://github.com/chillzhuang/SpringBlade/commit/c69b9547c942c697da2f3ee6a9265b6004abd645","https://github.com/chillzhuang/SpringBlade","https://www.vulncheck.com/advisories/springblade-privilege-escalation-via-exposed-feign-endpoint"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-56100","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-56100","identifiers":["CVE-2026-56100"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. 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