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.
CVE-2026-56100
HIGHPre-NVD 8.18.1—Trending — 4 sources updated this weekElevated
EchelonGraph scoreHIGH confidence
Score 8.1 from GitHub Security Advisory (severity: HIGH) published 2026-08-28. a secondary CVSS source baseline 8.1; sources differ by 0.0.
Triggered by: GitHub Security Advisory CVSS
Sources: ghsa, secondary
8.1EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
- High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 8.1Exploit: Elevated riskExposed: 0
No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.
- CVSS v3
- 8.1
- EG Score
- 8.1(high)
- EG Risk
- 52(Track*)EG Risk 52/100SSVC: Track*
EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).
How it’s computedSeverity81% × 45%Exploitation40% × 40%Automatability0% × 15%Action: Watch closely — could escalate to Attend. - EPSS PROB
- 0%
- EPSS %ILE
- 21%
- KEV
- Not listed
Published
August 28, 2026
Last Modified
August 29, 2026
Advisory Details (4)
Auto-updated Aug 28, 2026No patch confirmed yet.
generic
SpringBlade 2.7.3 < 5.0.0 Privilege Escalation via Exposed Feign Endpoint | Advisories | VulnCheck
https://www.vulncheck.com/advisories/springblade-privilege-escalation-via-exposed-feign-endpointgeneric
GitHub - chillzhuang/SpringBlade: SpringBlade 是一个由商业级项目升级优化而来的微服务架构，采用Spring Boot 4 、Spring Cloud 2025、Java 21 等核心技术构建，完全遵循阿里巴巴编码规范。提供基于React和Vue的两个前端框架用于快速搭建企业级的SaaS多租户微服务平台。 · GitHub
https://github.com/chillzhuang/SpringBladegeneric
Releases · chillzhuang/SpringBlade · GitHub
https://github.com/chillzhuang/SpringBlade/releases#release-v5.0.0generic
CVE-2026-56100-SpringBlade-AuthBypass · GitHub
https://gist.github.com/sud0why/e73405057dd7414a8c221ef17e0d0059#file-cve-2026-56100-springblade-authbypass-en-mdVendor Advisories for CVE-2026-56100(1)
These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.
Weakness Classification(1)
MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.
Data Freshness Timeline
(refreshed 14× in last 7d / 14× in last 30d)
Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.
- 2026-08-30 01:22 UTCEPSS rescore
- 2026-08-29 23:40 UTCGHSA enrichment
- 2026-08-29 12:20 UTCEG score recompute
- 2026-08-29 12:19 UTCGHSA enrichment
- 2026-08-29 11:58 UTCEG score recompute
- 2026-08-29 11:58 UTCGHSA enrichment
- 2026-08-29 10:05 UTCGHSA enrichment
- 2026-08-28 22:45 UTCEG score recompute
- 2026-08-28 22:44 UTCGHSA enrichment
- 2026-08-28 22:09 UTCEG score recompute
- 2026-08-28 22:09 UTCGHSA enrichment
- 2026-08-28 20:24 UTCEG score recompute
- 2026-08-28 19:38 UTCEG score recompute
- 2026-08-28 19:36 UTCMITRE cvelistV5first tracked
Related CVEs(same CWE)
Same CWE
10 shownCWE-862
- CVE-2013-3960EG 9.9CRITICAL
- CVE-2015-10143EG 9.8CRITICAL
- CVE-2016-11036EG 9.8CRITICAL
- CVE-2018-11541EG 9.8CRITICAL
- CVE-2011-4183NVD 6.5EG 9.8CRITICAL
- CVE-2018-10251EG 9.8EPSS p90CRITICAL
- CVE-2018-1217EG 9.8EPSS p97CRITICAL
- CVE-2018-0015EG 9.8CRITICAL
- CVE-2017-12582EG 9.8CRITICAL
- CVE-2017-1000056EG 9.8CRITICAL
Frequently asked(5)
What is CVE-2026-56100?
CVE-2026-56100 is a high vulnerability published on August 28, 2026. 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…
When was CVE-2026-56100 disclosed?
CVE-2026-56100 was first published in the National Vulnerability Database on August 28, 2026, with the most recent update on August 29, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-56100 actively exploited?
CVE-2026-56100 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 79.0% of all scored CVEs.
What is the CVSS score of CVE-2026-56100?
CVE-2026-56100 has a CVSS v3 base score of 8.1 (NVD).
How do I remediate CVE-2026-56100?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-56100, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.
Dependency Blast Radius
Explore the affected products and dependency analysis for CVE-2026-56100
Is Your Infrastructure Affected by CVE-2026-56100?
EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.