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CVE-2026-71960

CriticalPublished

Cudy WR3000 2.0 Hard-coded JWT Secret Authentication Bypass via MQTT

Published: Aug 19, 2026
Updated: Aug 31, 2026
Assigning CNA: VulnCheck
Evidence observed: Aug 22, 2026

Primary CVSS

9.3/ 10Critical

nvd · CVSS 4.0

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/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 probability estimate

0.5%

Low · next 30 days

Percentile: 44.3%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

Summary

Cudy WR3000 2.0 running firmware before 2.5.24 contains a hard-coded JWT HMAC signing secret vulnerability in the Mosquitto MQTT broker's authentication plugin that allows unauthenticated attackers to forge valid JWT tokens by extracting the secret from the firmware image. Attackers can use the extracted secret to craft arbitrary JWT tokens and authenticate to the MQTT broker without legitimate credentials, gaining unauthorized access to the device's mesh networking interface.

Sources

the-same-key-opens-every-box-cve-2026-71960-hard-coded-jwt-secret-in-cudy-wr3000-mesh-mqttExploit
PoC toolkit that unpacks router firmware, decrypts device secrets, forges JWT tokens, and exploits CVE-2026-71960/71961 to take over Cudy WR3000 mesh MQTT brokers.

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