CVE-2026-40784
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 · uneditedAuthorization Bypass Through User-Controlled Key vulnerability in Mahmudul Hasan Arif FluentBoards fluent-boards allows Exploiting Incorrectly Configured Access Control Security Levels.This issue affects FluentBoards: from n/a through <= 1.91.2.
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 · moderate confidenceThis is an Authorization Bypass Through User-Controlled Key vulnerability in FluentBoards <= 1.91.2. Attackers can manipulate a user-controlled key (such as an ID or parameter) to access resources or functionality belonging to other users due to incorrectly configured access control security levels.
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
- High
- Availability
- None
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/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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Determine installed FluentBoards versionCheck the application version in the software itself (typically found in the UI footer, an /about endpoint, or version file in the installation directory)Affected if The installed version is 1.91.2 or lower
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Identify API endpoints accepting user-controlled keysReview application API routes or controller definitions to locate endpoints that accept ID parameters, such as board IDs, item IDs, or record identifiers in the requestAffected if The application exposes endpoints that accept user-controlled identifiers without explicit ownership validation
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Test for broken access control on sensitive operationsUsing an authenticated account, manipulate identifier parameters (such as IDs in URLs or request bodies) in API calls to access resources belonging to a different userAffected if Requests with another user's identifiers are successfully processed without proper authorization failures
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Verify authorization logic for resource accessInspect the application source code or configuration to confirm that access control checks validate ownership/permissions before granting resource accessAffected if Authorization logic is missing or incorrectly validates user-controlled keys before allowing access to sensitive data
A user is affected if FluentBoards version 1.91.2 or lower is installed and the application processes user-controlled keys in requests without proper ownership validation.
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.
From vendor dataApply the vendor patch when available. Until then, implement additional server-side authorization checks on all sensitive operations and verify that user-controlled keys properly validate ownership or permissions before granting access.
- Consultation3.0 h
- Implementation6.0 h
- Testing4.0 h
- Review / QA2.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2026-40784 — 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-2026-40784 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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- Verified mitigations, workarounds, and config changes
- Version or environment caveats, and links to real fixes
- No weaponised exploit code, or anything meant to cause harm
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