Which versions of Wl Nu516U1 are affected by CVE-2026-4166?

CVE-2026-4166 is a low-severity vulnerability in A vulnerability involving cross-site scripting (CVSS 3.5).

Is there a public PoC exploit available for CVE-2026-4166?

Yes, a public proof-of-concept exploit is available for CVE-2026-4166. Prioritise patching immediately. EPSS: 0.0%.

How to fix or mitigate CVE-2026-4166?

During next maintenance window: Apply vendor patches when convenient. Verify cross-site scripting controls are in place.

Wl Nu516U1 CVE-2026-4166

Q: What is the CVSS score of CVE-2026-4166?

CVE-2026-4166 has a CVSS 4.0 base score of 2.0 (Low). CVSS vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:L/VA:N/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. EPSS exploitation probability: 0.0%.

EUVD-2026-12208 LOW

Cross-site Scripting (XSS) (CWE-79)

2026-03-15 VulDB

XSS Wl Nu516U1

2.0

CVSS 4.0 · NVD

Severity by source

NVD PRIMARY

2.0 LOW

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:L/VA:N/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

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:L/VA:N/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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

Scope

Lifecycle Timeline

Severity Changed

Apr 29, 2026 - 01:11 NVD

MEDIUM LOW

CVSS changed

Apr 29, 2026 - 01:11 NVD

5.1 (MEDIUM) 2.0 (LOW)

Severity Changed

Apr 22, 2026 - 21:37 NVD

LOW MEDIUM

CVSS changed

Apr 22, 2026 - 21:37 NVD

3.5 (LOW) 5.1 (MEDIUM)

PoC Detected

Mar 16, 2026 - 14:53 vuln.today

Public exploit code

EUVD ID Assigned

Mar 15, 2026 - 06:00 euvd

EUVD-2026-12208

Analysis Generated

Mar 15, 2026 - 06:00 vuln.today

CVE Published

Mar 15, 2026 - 05:32 nvd

LOW 3.5

DescriptionCVE.org

A vulnerability was found in Wavlink WL-NU516U1 240425. The impacted element is the function sub_404F68 of the file /cgi-bin/login.cgi. The manipulation of the argument homepage/hostname results in cross site scripting. The attack can be launched remotely. The exploit has been made public and could be used. The vendor was contacted early about this disclosure.

AnalysisAI

A vulnerability was found in Wavlink WL-NU516U1 240425.

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Vulnerability AssessmentAI

Risk Assessment	Attackers can steal session cookies, redirect users to malicious sites, deface content, or perform actions on behalf of authenticated users. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario	An attacker injects a JavaScript payload into a vulnerable input field. When another user views the page, the script executes in their browser, stealing their session token.
Remediation	Encode all user-supplied output contextually (HTML, JS, URL). … Detailed patch versions, workarounds, and compensating controls in full report.

Recommended ActionAI

During next maintenance window: Apply vendor patches when convenient. …

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CVE-2026-4166 vulnerability details – vuln.today

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