Cyber Resilience

CVE-2026-8191

LowPublic PoC

Published: 09 May 2026

Published
09 May 2026
Modified
13 May 2026
KEV Added
—
Patch
—
CVSS Score v4 2.1 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
EPSS Score 0.0534 91.6th percentile
Risk Priority 35 floored blend · peak EPSS

Summary

CVE-2026-8191 is a low-severity Command Injection (CWE-77) vulnerability in Wavlink Wl-Nu516U1 Firmware. Its CVSS base score is 2.1 (Low).

Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked in the top 8.4% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog; a public proof-of-concept is referenced.

Deeper analysis

A vulnerability identified as CVE-2026-8191 affects the Wavlink NU516U1 router running firmware M16U1_V240425. It resides in the wifi_region function within /cgi-bin/adm.cgi, where unsanitized input to the skiplist1 and skiplist2 arguments enables operating system command injection. The issue is tracked under CWE-77 and CWE-78 and carries a CVSS 4.0 score of 2.1.

An authenticated remote attacker can supply crafted parameters to the affected CGI endpoint and execute arbitrary commands on the device. The attack requires no user interaction and can be launched over the network, with a publicly available proof-of-concept already posted to GitHub.

The EPSS score rose from a low baseline to a recorded peak of 0.0106, indicating increased exploitation interest after disclosure. No vendor patch or mitigation guidance is referenced in the available advisories, though the vendor was notified prior to publication.

OWASP Top 10 for Web (2025)

A05:2025 Injection

EU & UK References

Vulnerability details

A vulnerability was identified in Wavlink NU516U1 M16U1_V240425. This affects the function wifi_region of the file /cgi-bin/adm.cgi. Such manipulation of the argument skiplist1/skiplist2 leads to os command injection. The attack can be launched remotely. The exploit is publicly available and…

more

might be used. The vendor was contacted early about this disclosure.

CWE(s)
CWE-77CWE-78

Related Threats

MITRE ATT&CK Enterprise TechniquesAI

T1190 Exploit Public-Facing Application Initial Access
Adversaries may attempt to exploit a weakness in an Internet-facing host or system to initially access a network.
attack.mitre.org →
T1059.004 Unix Shell Execution
Adversaries may abuse Unix shell commands and scripts for execution.
attack.mitre.org →
Why these techniques?

Remote OS command injection in public-facing CGI directly enables T1190 exploitation and Unix shell command execution via T1059.004.

Confidence: HIGH · MITRE ATT&CK Enterprise v19.0

CVEs Like This One

CVE-2026-8192Same product: Wavlink Wl-Nu516U1
CVE-2026-8188Same product: Wavlink Wl-Nu516U1
CVE-2026-8230Same product: Wavlink Wl-Nu516U1
CVE-2026-8189Same product: Wavlink Wl-Nu516U1
CVE-2026-8227Same product: Wavlink Wl-Nu516U1
CVE-2026-8229Same product: Wavlink Wl-Nu516U1
CVE-2026-8228Same product: Wavlink Wl-Nu516U1
CVE-2026-8190Same product: Wavlink Wl-Nu516U1
CVE-2026-3662Same product: Wavlink Wl-Nu516U1
CVE-2026-3661Same product: Wavlink Wl-Nu516U1

Affected Assets

wavlink
wl-nu516u1 firmware
m16u1_v240425

Mitigating Controls

Likely Mitigating Controls AI

Per-CVE control mapping for this CVE has not run yet; the list below is derived from the weakness types (CWEs) cited in the NVD entry.

SC-27 Platform-independent Applications
addresses: CWE-78

Platform-independent apps typically execute inside a managed runtime or sandbox that restricts direct OS command execution, reducing the ability to exploit OS command injection.

SI-10 Information Input Validation
addresses: CWE-78

Validates inputs to block special elements that would alter OS command execution.

References