CVE-2026-36176

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.

CVSS v3.1 Score

7.1

HIGH

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

EPSS — Exploit Prediction

0.0010

Probability of exploitation

0.01%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Weakness Type (CWE)

CWE-312 CWE-312

References

Other References

http://gncc.com http://gp5.com https://github.com/BadChemical/IoT-Vulnerability-Research-Public/blob/main/GNCC-GP5-T23/README.md https://github.com/BadChemical/IoT-Vulnerability-Research-Public/blob/main/GNCC-GP5-T23/README.md

Frequently Asked Questions

What is CVE-2026-36176? +

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. It has a CVSS v3.1 base score of 7.1 (HIGH).

How severe is CVE-2026-36176? +

CVE-2026-36176 has a CVSS v3.1 score of 7.1 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching. The EPSS score is 0.0010, placing it in the 0th percentile for exploitation probability.

How do I check if I'm vulnerable to CVE-2026-36176? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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