{"id":"CVE-2026-56100","aliases":[],"url":"https://o3.security/vulnerability/CVE-2026-56100","summary":"SpringBlade versions 2.7.3 through 3.5.0 contain a privilege escalation vulnerability that allows authenticated attackers to create system administrator accounts by sending crafted…","details":"SpringBlade versions 2.7.3 through 3.5.0 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.","published":"2026-08-28T20:18:30.640","modified":"2026-08-28T20:18:30.640","cvss":{"score":8.1,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N"},"epss":null,"cisaKev":null,"exploitsKnown":null,"affectedPackages":[],"fix":{"url":"https://github.com/chillzhuang/SpringBlade/commit/c69b9547c942c697da2f3ee6a9265b6004abd645","label":"chillzhuang/SpringBlade@c69b954"},"references":[{"type":"WEB","url":"https://gist.github.com/sud0why/e73405057dd7414a8c221ef17e0d0059#file-cve-2026-56100-springblade-authbypass-en-md"},{"type":"WEB","url":"https://github.com/chillzhuang/SpringBlade"},{"type":"WEB","url":"https://github.com/chillzhuang/SpringBlade/commit/c69b9547c942c697da2f3ee6a9265b6004abd645"},{"type":"WEB","url":"https://github.com/chillzhuang/SpringBlade/releases#release-v5.0.0"},{"type":"WEB","url":"https://www.vulncheck.com/advisories/springblade-privilege-escalation-via-exposed-feign-endpoint"}],"provenance":{"sources":["OSV.dev","NVD","FIRST.org (EPSS)"],"lastVerified":"2026-08-28T20:18:30.640"}}