CVE-2026-18590Network attack vector

Authenticated command execution via admin password handler

Published Aug 3, 2026 · Updated Aug 3, 2026

OS command injection in Wavlink WL-NU516U1 firmware 708c073-mt7628 allows remote authenticated users to execute commands. The record identifies set_sys_adm in adm.cgi's Admin Password Handler, but the referenced GitHub report is unavailable and the exact input-to-shell operation is undisclosed. Authenticated access is required; successful exploitation executes operating-system commands on the network print-server appliance.

CVSS severity6.3
Medium
EPSS probability1.07%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

OS command injection in Wavlink WL-NU516U1 firmware 708c073-mt7628 allows remote authenticated users to execute commands. The record identifies set_sys_adm in adm.cgi's Admin Password Handler, but the referenced GitHub report is unavailable and the exact input-to-shell operation is undisclosed. Authenticated access is required; successful exploitation executes operating-system commands on the network print-server appliance.

The record

CVE
CVE-2026-18590
Published
Aug 3, 2026
Updated
Aug 3, 2026
Vendor
Wavlink
Product
WL-NU516U1
Classifications
CWE-78, CWE-77, T1059
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 3, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=708c073-mt7628

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Wavlink · WL-NU516U1version=708c073-mt7628

Published CVSS scores

6.3VulDBCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L
2.1VulDBCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P
6.5VulDBAV:N/AC:L/Au:S/C:P/I:P/A:P

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-78Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
CWE-77Improper Neutralization of Special Elements used in a Command ('Command Injection')
T1059Command and Scripting Interpreter

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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