Description
An issue was discovered in NJHYST HY511 POE core before 2.1 and plugins before 0.1. The vulnerability stems from the device's insufficient cookie verification, allowing an attacker to directly request the configuration file address and download the core configuration file without logging into the device management backend. By reading the corresponding username and self-decrypted MD5 password in the core configuration file, the attacker can directly log in to the backend, thereby bypassing the front-end backend login page.
Affected products
njhyst: hy511 firmware; njhyst: hy511
References2
- github.com/a2148001284/test1/blob/main/%E6%9C%AA%E6%8E%88%E6%9D… ExploitThird Party Advisory
- gist.github.com/a2148001284/bcdda75fc8718454f16a7b9259463719 Third Party Advisory
Metrics
- CVSS 3.1
-
9.8
CRITICAL
Score source: CNA
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - EPSS — exploit probability
- 5% percentile: 93 · as of 11 November 2026
- CWE
- CWE-565
Could this be exploited in your environment?
A patch closes the known hole. A penetration test shows what an attacker can still reach — with proof.