Auth bypass in Nexxt Solutions Nebula 300+ / Tenda F3 V2.0 Firmware

CVE-2026-31846

Missing authentication in the /goform/ate endpoint in Nexxt Solutions Nebula 300+ firmware through version 12.01.01.37 allows an adjacent unauthenticated attacker to retrieve sensitive device information, including the administrator password. An attacker can decode this value to obtain valid administrative credentials and authenticate to the device.

Vulnerability class: Broken Authentication

Published · last modified .

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.

EPSS exploit prediction

EPSS: 0.004 (31.1th percentile), scored .

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 31st percentile — 31.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS trend (30 days)EPSS over the last 30 days for CVE-2026-31846: held from 0.003 to 0.004.

EPSS over last 30 days · oldest: 0.003 · newest: 0.004 · change: +0.001

Affected products

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2026-31846?
CVE-2026-31846 is a medium-severity vulnerability in Nexxt Solutions Nebula 300+ / Tenda F3 V2.0 Firmware, classified under Missing Authentication for Critical Function. CVSS score: 6.5/10. Published 2026-03-23.
How severe is CVE-2026-31846?
Medium severity. CVSS v3 base score is 6.5 out of 10.