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CVE-2026-18590— Wavlink WL-NU516U1 Admin Password adm.cgi set_sys_adm os command injection

Quick assessment

Affected
Wavlink WL-NU516U1
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

WAVLINK wl-nu516u1 firmware是中国WAVLINK公司的一款一套无线网卡的固件程序。 WAVLINK wl-nu516u1 firmware 708c073-mt7628版本存在命令注入漏洞，该漏洞源于adm.cgi文件的set_sys_adm函数存在os命令注入，可能导致远程执行任意命令。

CVSS 6.3 · Medium EPSS 1.82% · P78

Affected Version Matrix 1

VendorProduct Version RangeStatus
Wavlink WL-NU516U1 708c073-mt7628 affected
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I. Basic Information for CVE-2026-18590

Vulnerability Information
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Vulnerability Title
Wavlink WL-NU516U1 Admin Password adm.cgi set_sys_adm os command injection
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
OS命令中使用的特殊元素转义处理不恰当(OS命令注入)
Source: CVE Program / CVE List V5
Vulnerability Title
WAVLINK wl-nu516u1 firmware 命令注入漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
WAVLINK wl-nu516u1 firmware是中国WAVLINK公司的一款一套无线网卡的固件程序。 WAVLINK wl-nu516u1 firmware 708c073-mt7628版本存在命令注入漏洞，该漏洞源于adm.cgi文件的set_sys_adm函数存在os命令注入，可能导致远程执行任意命令。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Wavlink WL-NU516U1 708c073-mt7628 cpe:2.3:o:wavlink:wl-nu516u1_firmware:*:*:*:*:*:*:*:*

II. Public POCs for CVE-2026-18590

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III. Intelligence Information for CVE-2026-18590

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Security Blog Posts for CVE-2026-18590 (1)

Same Patch Batch · Wavlink · 2026-08-03 · 5 CVEs total

CVE-2026-18589 9.8 CRITICAL Wavlink WL-NU516U1 nas.cgi change_password stack-based overflow
CVE-2026-18588 9.8 CRITICAL Wavlink WL-NU516U1 nas.cgi fgets stack-based overflow
CVE-2026-18607 8.8 HIGH Wavlink NU516 lighttpd upload.cgi strcpy stack-based overflow
CVE-2026-18587 7.5 HIGH Wavlink WL-NU516U1 Config Import os command injection

IV. Related Vulnerabilities

Same product: WL-NU516U1
Same vendor: Wavlink
Same weakness: CWE-78

V. Comments for CVE-2026-18590

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