November 13, 2026

CVE Watchtower

CVE-2026-75491Shenzhen Cudy Technology Co., Ltd. TR3000

NVD

Vulnerability Summary

Cudy TR3000 before 2.5.42 contains an authentication bypass vulnerability in the Mosquitto plugin auth_plugin_jwt.so that accepts unsigned JWTs using alg none. Attackers holding any Cudy-trusted client certificate can authenticate as admincudydevice on port 8883 and publish batchcmd requests to execute commands as root.
Severity Level
CRITICAL(9.2)
Published Date
Nov 13, 2026
Last Modified
Nov 13, 2026
Exploitation Status
No confirmed exploitation yet
Root Weakness (CWE)
CWE-347 β†—
See the MITRE CWE entry for the full definition of this weakness.
CVSS v4.0 Base Metrics — Score 9.2 (CRITICAL)
CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Attack VectorNetwork
Attack ComplexityHigh
Attack RequirementsPresent
Privileges RequiredNone
User InteractionNone
Confidentiality (Vulnerable System)High
Integrity (Vulnerable System)High
Availability (Vulnerable System)High
Confidentiality (Subsequent System)None
Integrity (Subsequent System)None
Availability (Subsequent System)None
Show CVSS v3.x metrics (score 8.1)
CVSS v3.1 Base Metrics — Score 8.1 (HIGH)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack VectorNetwork
Attack ComplexityHigh
Privileges RequiredNone
User InteractionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh

Affected & Patched Versions

Affected Versions
  • Shenzhen Cudy Technology Co., Ltd. TR3000 1.0 < 2.5.42
Patched Versions
  • Shenzhen Cudy Technology Co., Ltd. TR3000 1.0 2.5.42

What to do

Plan remediation soon. No exploitation is confirmed yet, but the severity is critical.

  1. Check whether you run Shenzhen Cudy Technology Co., Ltd. TR3000 and which version.
  2. Update to a patched version listed above, then confirm the new version.

Timeline

  • Nov 13, 2026Published
  • Nov 13, 2026Record last modified

Score, severity and exploitation changes are tracked from the day Watchtower started logging them.

Get notified about new Shenzhen Cudy Technology Co., Ltd. TR3000 CVEsYou are reading CVE-2026-75491. Get an email when KEV listings, exploits or new CVEs match your stack.
Set up CVE alerts

External References

Data last checked: Nov 13, 2026 10:08 (site time)