CVE-2026-6272
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 · uneditedA client holding only a read JWT scope can still register itself as a signal provider through the production kuksa.val.v2 OpenProviderStream API by sending ProvideSignalRequest. 1. Obtain any valid token with only read scope. 2. Connect to the normal production gRPC API (kuksa.val.v2). 3. Open OpenProviderStream. 4. Send ProvideSignalRequest for a target signal ID. 5. Wait for the broker to forward GetProviderValueRequest. 6. Reply with attacker-controlled GetProviderValueResponse. 7. Other clients performing GetValue / GetValues for that signal receive forged data.
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 confidenceThis is an authorization bypass vulnerability in the kuksa.val.v2 gRPC API where JWT scope validation is insufficient. Clients possessing only read permissions can register as signal providers through the OpenProviderStream API by sending ProvideSignalRequest, allowing them to inject attacker-controlled data that will be propagated to other clients performing legitimate GetValue/GetValues requests.
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
- Authentication
- X
- User interaction
- None
- Scope
- X
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:H/SC:N/SI:H/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
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 if kuksa.val.v2 gRPC service is runningCheck for processes or containers exposing the kuksa.val.v2 gRPC API (typically port 8090 or configured port). Use 'ps aux | grep kuksa' or 'docker ps' to locate the service.Affected if The kuksa.val.v2 gRPC service is exposed and accessible.
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Locate the JWT authorization configurationExamine the kuksa.val configuration files (often in /etc/kuksa/, /config/, or environment variables) for JWT validation settings. Look for scope definitions and permission mappings.Affected if JWT-based authorization is configured and read-level tokens are defined.
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Verify scope validation is implemented for OpenProviderStreamInspect the source code or configuration of the kuksa.val.v2 API to determine if OpenProviderStream performs scope checks. Look for provider/write permission enforcement before accepting ProvideSignalRequest.Affected if The OpenProviderStream method lacks proper scope validation for write/provider permissions.
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Test if read-only tokens can access provider functionalityUsing a client with a JWT token containing only read scopes (e.g., 'read' or 'vehicle:#' permissions), attempt to call OpenProviderStream and send ProvideSignalRequest. Observe whether the service accepts the request.Affected if Read-level JWT tokens are able to successfully register as signal providers and inject data.
The environment is affected if the kuksa.val.v2 gRPC service is running and read-only JWT tokens can successfully call OpenProviderStream to register as signal providers, bypassing the required write/provider scope enforcement.
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 dataImplement strict scope validation at the API entry point to ensure only tokens with explicit write or provider scopes can execute ProvideSignalRequest and register as signal providers.
- Consultation4.0 h
- Implementation8.0 h
- Testing6.0 h
- Review / QA4.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $6,176.
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Free · runs locallyCheck whether your project pulls in CVE-2026-6272 — 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-2026-6272 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
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- Version or environment caveats, and links to real fixes
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