# CVE-2026-31846: Unauthenticated Credential Disclosure via /goform/ate in Nexxt Nebula 300+

> An unauthenticated attacker can retrieve administrator credentials from the device, leading to full administrative access.

- **Severity:** High 7.1 (`CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 23 Mar 2026
- **Updated:** 10 Aug 2026
- **Also known as:** GHSA-gf7h-gjp8-r79h

## What is CVE-2026-31846?

CVE-2026-31846 is a high-severity vulnerability in Nexxt Solutions Nebula 300+ / Tenda F3 V2.0 Firmware, published on 23 Mar 2026. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

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.

Weakness: CWE-306 (Missing Authentication for Critical Functionality)

## Which versions are affected by CVE-2026-31846?


## How do I fix CVE-2026-31846?

No fix has been published for CVE-2026-31846 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-31846 being exploited?

There is no known exploitation of CVE-2026-31846 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-31846 and fix it if it is affected.

What it is: CVE-2026-31846 is a high-severity vulnerability in Nexxt Solutions Nebula 300+ / Tenda F3 V2.0 Firmware, published on 23 Mar 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-31846 in the wild and no public exploit code.

Affected product: Nexxt Solutions Nebula 300+ / Tenda F3 V2.0 Firmware. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-31846/ (Markdown: https://insights.sbomify.com/CVE-2026-31846/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-31846
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-31846
- OSV: https://osv.dev/vulnerability/CVE-2026-31846

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From sbomify Insights: https://insights.sbomify.com/CVE-2026-31846/
Summaries are generated and may contain mistakes; the official description above is the record.