CVE-2026-18590

Exploitation

Assessed, none found. CISA's assessment recorded neither public exploit code nor evidence of exploitation when it was made.

SSVC decision

• ExploitationnoneCISA recorded no public exploit code and no evidence of exploitation.
• AutomatablenoAt least one step from reconnaissance to exploitation cannot be reliably automated.
• Technical ImpactpartialSuccessful exploitation gives limited control of the vulnerable component.

CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.

EPSS probability

1.07% probability of exploitation activity in the next 30 days.

EPSS percentile

Ranks above 62.4% of scored records. A rank, not a probability.

NVD base score

2.1 (CVSS v4.0), scored by the NVD independently of the CNA.

NVD CVSS vector

CVSS: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/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

NVD analysis status

Deferred. NVD last modified this record on 2026-08-12.

Red Hat severity

No Red Hat rating. Red Hat rates the CVEs that affect its products.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

Published

2026-08-03 06:45Z1 MO AGO

Last updated

2026-08-03 15:37Z1 MO AGO

Reserved

2026-08-02

Assigning CNA

VulDB

Record state

PUBLISHED

Severity

Medium (CVSS 5.3)

CNA CVSS vector

CVSS: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

Weaknesses

• CWE-77Improper Neutralization of Special Elements used in a Command ('Command Injection')Class
• CWE-78Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')Base

Data version

5.2

Document digest

a79f4e286aab364e45ee1cb998aecce0ad5addcdaa20f7c05099b4b7c41ae272

• vuldb.comVDB-385418 | Wavlink WL-NU516U1 Admin Password adm.cgi set_sys_adm os command injectionhttps://vuldb.com/vuln/385418vdb-entrytechnical-description
• vuldb.comVDB-385418 | CTI Indicators (IOB, IOC, TTP, IOA)https://vuldb.com/vuln/385418/ctisignaturepermissions-required
• vuldb.comCVE-2026-18590 | CVE Analysis and Reporthttps://vuldb.com/cve/CVE-2026-18590third-party-advisory
• vuldb.comSubmit #850527 | WAVLINK NU516U1 2026-05-15 (build 708c073-mt7628) Command Injectionhttps://vuldb.com/submit/850527third-party-advisory
• vuldb.comSubmit #850560 | WAVLINK NU516U1 2026-05-15 (build 708c073-mt7628) Command Injection (Duplicate)https://vuldb.com/submit/850560third-party-advisory
• github.comhttps://github.com/oduoke567/WAVLINK-NU516U1-2026-05-1/blob/main/report2.mdbroken-link
• dl.wavlink.comhttps://dl.wavlink.com/firmware/RD/WINSTAR_NU516U1-WO-A-2026-07-13-4b8a21f-mt7628-squashfs-sysupgrade.binbroken-linkpatch