CVE-2026-40009
Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.
NVD · uneditedImproper Privilege Management, Improper Access Control vulnerability in Apache IoTDB. Authenticated users can escalate to full tree-path access by renaming themselves to __internal_auditor. This issue affects Apache IoTDB: from 2.0.8 before 2.0.10. Users are recommended to upgrade to version 2.0.10, which fixes the issue.
Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.
dbcve analysis · high confidenceAuthenticated Apache IoTDB users can escalate privileges to full tree-path access by renaming their account to the reserved __internal_auditor username, exploiting improper privilege management in the user authentication system.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.
From the vector- Attack vector
- Network
- Complexity
- Low
- Privileges
- Low
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- None
- Availability
- None
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.
dbcve checksWork through these to decide whether this CVE applies to you.
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Identify installed Apache IoTDB versionRun 'iotdb --version' or check the installation directory for version files, or query the system via the SQL interface with 'SHOW VERSION'Affected if The installed version is earlier than 2.0.10 (e.g., 2.0.x versions before 2.0.10, or 1.x versions)
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List all users in the systemConnect to IoTDB and execute 'LIST USER' or query the user management system to retrieve all registered usernamesAffected if A user account has been renamed to or currently exists with the reserved username '__internal_auditor'
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Check privileges assigned to __internal_auditorIf the __internal_auditor user exists, query its privileges with 'LIST PRIVILEGES OF USER __internal_auditor' or similar privilege inspection commandAffected if The __internal_auditor user holds full tree-path access privileges or elevated system privileges beyond normal user permissions
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Inspect user authentication configurationExamine the IoTDB configuration files (iotdb-common.properties, iotdb-datanode.properties) for user management settings and look for any user rename or privilege assignment operations in audit logs if availableAffected if User account renaming is permitted or there are logs indicating accounts were renamed to the reserved __internal_auditor username
You are affected if running Apache IoTDB version before 2.0.10 and the reserved __internal_auditor user account exists with elevated privileges in your environment.
Generated from the published advisory. Verify against your own configuration.
Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.
dbcve · scopedUpgrade Apache IoTDB to version 2.0.10 or later to remediate this privilege escalation vulnerability.
2.0.10
- 1. Back up your existing Apache IoTDB data and configuration
- 2. Download Apache IoTDB version 2.0.10 from the official Apache IoTDB distribution (https://iotdb.apache.org/)
- 3. Follow the official upgrade instructions for your deployment method (standalone or cluster)
- 4. Restore your data and configuration to the new installation
- 5. Start the upgraded IoTDB 2.0.10 service
Generated from the published advisory — verify against the referenced sources before acting.
- Consultation3.0 h
- Implementation4.0 h
- Testing3.0 h
- Review / QA2.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $3,408.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2026-40009 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2026-40009 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
No notes yet
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- Version or environment caveats, and links to real fixes
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