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Command InjectionWeakness · CWE-77

CVE-2026-18590

MEDIUM · 6.3 CVSS v3.1 Published 2026-08-03
No fix yet
No fix has been published. The vendor has not shipped a fixed release or patch. You remain exposed.
See remediation →
69/100
Remediation priority · Elevated
Remotely reachable Zero-click 2 weeks old

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 · unedited
A vulnerability was determined in Wavlink WL-NU516U1 708c073-mt7628. Affected is the function set_sys_adm of the file adm.cgi of the component Admin Password Handler. This manipulation causes os command injection. The attack is possible to be carried out remotely. The exploit has been publicly disclosed and may be utilized. It is suggested to upgrade the affected component. The vendor was contacted early, responded in a very professional manner and quickly released a fixed version of the affected product.

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
How this class of weakness works · CWE-77

User input reaches a command interpreter without being fully separated from the command itself, so an attacker can append instructions of their own. Because those run with the application's privileges, it frequently means control of the host. The lasting fix is to avoid constructing commands from input — call APIs directly and pass arguments as data, never as concatenated strings.

General guidance for the command injection class — the official description and references above are authoritative for this specific CVE. Want a bespoke review and a reviewed fix? Ask our team →

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
Low
Integrity
Low
Availability
Low

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L

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 · scoped
Recommended fix Moderate confidence

Wavlink WL-NU516U1 latest firmware (vendor released fix - obtain from dl.wavlink.com)

  1. 1. Identify the current firmware version of the Wavlink WL-NU516U1 device by accessing the admin web interface or checking the device label
  2. 2. Visit the official Wavlink support page at dl.wavlink.com to download the latest firmware version
  3. 3. Navigate to the admin interface (typically at http://192.168.1.1 or similar) and log in with administrator credentials
  4. 4. Locate the firmware upgrade section in the admin settings (usually under Administration > Firmware Upgrade or System > Backup/Restore)
  5. 5. Upload the downloaded firmware file and initiate the upgrade process
  6. 6. Wait for the device to reboot and verify the new firmware version is installed
  7. 7. After upgrading, verify that the adm.cgi endpoint no longer accepts malicious command injection payloads in the admin password handler parameters
Caveat Standard firmware upgrade risks apply - ensure stable power during update; settings may reset to defaults

Generated from the published advisory — verify against the referenced sources before acting.

No vendor fix exists The vendor has not published a patch for this.

There is no version to upgrade to and no patch to apply. Every affected install stays exposed until the vendor ships a fix — or somebody else builds one.

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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2026-18590 in production — separate from our analysis above.

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