CVE-2026-50748
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 malicious actor with access to the network and low privileges could exploit an Improper Input Validation vulnerability found in UniFi Access Application to execute a Command Injection on the host 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 confidenceUniFi Access Application contains an Improper Input Validation vulnerability that allows a remote attacker with low-privilege network access to inject and execute arbitrary operating system commands on the host device, potentially leading to complete system compromise.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.
NVD · CPE data< 4.2.29CVSS 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
- Changed
- Confidentiality
- High
- Integrity
- High
- Availability
- High
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/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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Confirm UniFi Access Application is installedLocate the UniFi Access Application on the system. Check for processes named 'unifi-access', 'ua', or similar UniFi-related services running on the host.Affected if The application is present and running on the system
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Identify installed versionQuery the installed UniFi Access Application for its version number. This is typically accessible via the application UI, command-line tool, or system package manager.Affected if Version returned is lower than 4.2.29
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Verify low-privilege network access is possibleCheck network configuration to determine if the UniFi Access Application management interface or API is accessible over the network to unauthenticated or low-privilege users.Affected if The application interface is exposed to untrusted network segments without proper access controls
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Confirm command injection vector existsReview application logs or test input fields within the UniFi Access Application that accept user-supplied data (such as user management, door settings, or API endpoints).Affected if Input fields accept special characters without sanitization, indicating potential injection points
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Check for existing compromise indicatorsExamine system logs (/var/log, application logs) for unexpected shell command executions, unusual process spawning, or unauthorized account modifications.Affected if Evidence of arbitrary command execution or unexpected system changes is found
The environment is affected if UniFi Access Application is running with a version lower than 4.2.29 and is accessible over the network to low-privilege users.
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 · scoped4.2.29
Apply vendor-provided security patches immediately, restrict network access to the UniFi Access Application to trusted sources, and audit accounts and permissions following the principle of least privilege.
UniFi Access Application 4.2.29 or later
- 1. Identify the current UniFi Access Application version currently installed on the system
- 2. Create a backup of the current UniFi Access configuration
- 3. Download UniFi Access Application version 4.2.29 or later from the official Ubiquiti downloads
- 4. Stop the UniFi Access Application service before upgrading
- 5. Install the updated UniFi Access Application package (version 4.2.29 or newer)
- 6. Start the UniFi Access Application service
- 7. Verify the application is running the updated version (4.2.29 or later)
- 8. Confirm normal operation by testing access control functionality
Generated from the published advisory — verify against the referenced sources before acting.
- Consultation4.0 h
- Implementation2.0 h
- Testing6.0 h
- Review / QA3.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2026-50748 — 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-2026-50748 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
- No spam, self-promotion, credentials, or personal data