EUVD-2026-77525
GHSA-45m3-3j6g-xv67
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Nimbus is network-accessible (AV:N) but requires specific non-default group-only config (AC:H); valid authenticated credentials required (PR:L); full cluster operations exposed (C:H/I:H/A:H).
Primary rating from Vendor (CNA).
CVSS VectorVendor
Lifecycle Timeline
5Description PRE-NVD
Articles & Coverage 1
AnalysisAI
Authorization bypass in Apache Storm Client 3.0.0 permits any authenticated Nimbus principal to perform unrestricted user-level cluster operations when access control is configured via nimbus.groups alone. The SimpleACLAuthorizer evaluates user-level commands by returning early with a grant when nimbus.users is empty, never reaching the group evaluation branch, so group restrictions are silently ignored. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires three concurrent conditions: (1) `org.apache.storm:storm-client` version 3.0.0 through 3.0.x deployed with an active Nimbus instance; (2) the operator has configured `nimbus.groups` with at least one group entry intending to restrict cluster access, while `nimbus.users` is explicitly empty or unset; (3) the attacker holds valid Nimbus authentication credentials for any recognized principal regardless of group membership. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | No CVSS vector or EPSS score was provided in the input; all metric assessments below are independently derived from the advisory description. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Upgrade `org.apache.storm:storm-client` to version 3.1.0, confirmed as the fix release in the Apache Storm oss-security advisory. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, identify all Storm 3.0.0 deployments configured with nimbus.groups-only by reviewing configuration files and audit logs for suspicious topology submissions or file uploads that may indicate prior unauthorized access. …
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Same weakness CWE-863 – Incorrect Authorization
View allSame technique Authentication Bypass
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External POC / Exploit Code
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