{"id":"CVE-2026-56100","title":"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 int…","summary":"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 int…","severity":"high","cvss":8.1,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N","cwe":["CWE-862"],"published":"2026-08-28","updated":"2026-09-16","sourceUpdated":"2026-09-16T13:42:45.543","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-56100","references":[{"url":"https://gist.github.com/sud0why/e73405057dd7414a8c221ef17e0d0059#file-cve-2026-56100-springblade-authbypass-en-md","label":"disclosure@vulncheck.com"},{"url":"https://github.com/chillzhuang/SpringBlade","label":"disclosure@vulncheck.com"},{"url":"https://github.com/chillzhuang/SpringBlade/commit/c69b9547c942c697da2f3ee6a9265b6004abd645","label":"disclosure@vulncheck.com"},{"url":"https://github.com/chillzhuang/SpringBlade/releases#release-v5.0.0","label":"disclosure@vulncheck.com"},{"url":"https://www.vulncheck.com/advisories/springblade-privilege-escalation-via-exposed-feign-endpoint","label":"disclosure@vulncheck.com"}],"tags":["nvd","cve.org","exploit-available"],"epss":0.00525,"epssPercentile":0.44317,"ingestedAt":"2026-08-30T07:49:06.431Z","vendor":"SpringBlade","product":"SpringBlade","affected":["SpringBlade >= 2.7.3 < 5.0.0"],"exploitAvailable":true,"ssvc":{"exploitation":"poc","automatable":"no","technicalImpact":"total","timestamp":"2026-08-28T20:29:59.660106Z"},"slug":"CVE-2026-56100","body":"## Overview\n\nSpringBlade 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"midnight","depthScore":57,"depthScoreParts":{"impact":44.6,"likelihood":0.1,"exploitation":12,"ransomware":0},"changes":[{"seq":210267,"id":"CVE-2026-56100","ts":1790264828866,"field":"exploit_available","old":"false","new":"true"}]}