CVE-2026-36176

HIGH

GNCC GP5 7.1.76 - Unauthorized Operations via Plaintext Backblaze B2 Upload URL Exposure

Title source: llm

Description

GNCC GP5 v7.1.76 was discovered to store pre-signed Backblaze B2 upload URLs (PUT requests) in plaintext to the serial console. This allows physically-proximate attackers to extract these active tokens to perform unauthorized operations via monitoring the serial UART interface.

References (3)

Core 3

Core References

http://gncc.com

http://gp5.com

https://github.com/BadChemical/IoT-Vulnerability-Research-Public/blob/main/GNCC-GP5-T23/README.md

View Writeup ZIP pw:eip

Scores

CVSS v3 7.1

EPSS 0.0010

EPSS Percentile 1.2%

Attack Vector PHYSICAL

CVSS:3.1/AV:P/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N

CISA SSVC

Vulnrichment

Exploitation poc

Automatable no

Technical Impact partial

Details

CWE

CWE-312

Status published

Published Jun 04, 2026

Tracked Since Jun 04, 2026