CVE-2026-1840
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 · uneditedThe Aclara Metrum Cellular Web Interface is vulnerable to unauthorized access due to the absence of authentication controls on critical system functions. This weakness exposes essential configuration settings, allowing attackers to alter operational parameters and trigger system restarts without restriction. Such unauthorized changes can disrupt normal functionality and, if performed repeatedly, may lead to a loss of communications to the device.
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 confidenceThe Aclara Metrum Cellular Web Interface lacks authentication controls on critical system functions, allowing unauthenticated attackers to access configuration settings, modify operational parameters, and trigger device restarts. This can disrupt communications and normal device operation.
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
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- None
- Integrity
- None
- Availability
- High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
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 Aclara Metrum Cellular devices in your environmentInventory your network devices and confirm presence of Aclara Metrum Cellular meters or related hardware. Check device documentation, management interfaces, or network scans for Aclara Metrum product identifiers.Affected if You have Aclara Metrum Cellular devices deployed in your environment.
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Locate the web interface access pointIdentify the IP address or hostname used to access the Aclara Metrum Cellular web interface. This is typically configured during device setup and may be documented in device management systems.Affected if You have identified a web interface URL for Aclara Metrum Cellular devices.
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Test unauthenticated access to configuration endpointsAttempt to access common configuration paths on the web interface without providing any login credentials. Common paths may include /config, /settings, /system, /admin, or similar paths related to device configuration.Affected if The web interface returns configuration pages or settings without requiring any authentication.
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Test unauthenticated access to system restart functionsAttempt to access system control endpoints such as /restart, /reboot, /reset, or similar paths without authentication. Observe whether the device accepts these commands without a login session.Affected if The device accepts restart or reset commands without requiring authentication.
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Verify authentication is required for all web interface functionsUse a tool like curl or a browser (incognito/private mode) to send requests to various web interface endpoints and confirm each returns a login page, redirects to authentication, or returns an authentication error.Affected if Any critical endpoint (configuration, operational parameters, system control) is accessible without authentication.
If Aclara Metrum Cellular devices are present and their web interface allows access to configuration, operational parameters, or restart functions without any authentication, the environment is affected by this vulnerability.
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 proper authentication and authorization controls on all web interface endpoints, especially for configuration changes and system restart functions.
- Consultation6.0 h
- Implementation12.0 h
- Testing6.0 h
- Review / QA4.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2026-1840 — 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-2026-1840 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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