Administrator account creation via exposed Feign endpoint
Published Aug 28, 2026 · Updated Aug 29, 2026
Missing authorization in SpringBlade 2.7.3 through 4.10.0 allows remote authenticated users to create system administrator accounts. The gateway routes requests to UserClient.saveUser, whose RestController method lacks an authorization check and persists attacker-controlled user fields directly. A valid low-privilege JWT is sufficient; versions through 3.5.0 also expose hardcoded signing keys, enabling forged tokens, cross-tenant writes, and persistent administrator access.
Summary
What happened
Missing authorization in SpringBlade 2.7.3 through 4.10.0 allows remote authenticated users to create system administrator accounts. The gateway routes requests to UserClient.saveUser, whose RestController method lacks an authorization check and persists attacker-controlled user fields directly. A valid low-privilege JWT is sufficient; versions through 3.5.0 also expose hardcoded signing keys, enabling forged tokens, cross-tenant writes, and persistent administrator access.
The record
- CVE
- CVE-2026-56100
- Published
- Aug 28, 2026
- Updated
- Aug 29, 2026
- Vendor
- SpringBlade
- Product
- SpringBlade
- Classifications
- CWE-862, T1136
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- Aug 28, 2026CVE publishedPublication date reported by the CVE source.
- Aug 29, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=2.7.3 <5.0.0
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Public exploit references
- SpringBlade Feign endpoint privilege-escalation proof of conceptfunctional · demonstrated
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Technologies
Your stack
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Your stack
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