# CVE-2026-31849: Missing CSRF Protection on Administrative Endpoints in Nexxt Nebula 300+

> Attackers can force authenticated administrators to execute unauthorized configuration changes via crafted web requests due to missing CSRF protections.

- **Severity:** High 7.2 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 23 Mar 2026
- **Updated:** 10 Aug 2026
- **Also known as:** GHSA-fgpp-3hfm-jqqh

## What is CVE-2026-31849?

CVE-2026-31849 is a high-severity vulnerability in Nexxt Solutions Nebula 300+, published on 23 Mar 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

### Official description

Nexxt Solutions Nebula 300+ firmware through version 12.01.01.37 does not implement CSRF protections on state-changing endpoints such as /goform/setSysTools and other administrative interfaces. As a result, an attacker can craft malicious web requests that are executed in the context of an authenticated administrator’s browser, leading to unauthorized configuration changes, including enabling services or modifying system settings.

Weakness: CWE-352 (Cross-Site Request Forgery)

## Which versions are affected by CVE-2026-31849?

It affects 1 product.


Products: Nexxtsolutions Nebula300plus Firmware.

## How do I fix CVE-2026-31849?

No fix has been published for CVE-2026-31849 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-31849 being exploited?

There is no known exploitation of CVE-2026-31849 in the wild and no public exploit code.

## Other vulnerabilities in Nexxt Solutions Nebula 300+

- [CVE-2026-31848](https://insights.sbomify.com/CVE-2026-31848/): Reversible ecos_pw Cookie Allows Authentication Bypass in Nexxt Nebula 300+ (high 8.7)
- [CVE-2026-31847](https://insights.sbomify.com/CVE-2026-31847/): Hidden Functionality Enables Remote Telnet Activation via /goform/setSysTools in Nexxt Nebula 300+ (high 8.5)
- [CVE-2026-31851](https://insights.sbomify.com/CVE-2026-31851/): Nexxt Nebula 300+ - Lack of Rate Limiting Enables Brute-Force Attacks (high 7.7)
- [CVE-2026-31850](https://insights.sbomify.com/CVE-2026-31850/): Plaintext Storage of Credentials in Configuration Backup in Nexxt Nebula 300+ (medium 6.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-31849 and fix it if it is affected.

What it is: CVE-2026-31849 is a high-severity vulnerability in Nexxt Solutions Nebula 300+, published on 23 Mar 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2026-31849 in the wild and no public exploit code.

Affected product: Nexxt Solutions Nebula 300+. 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-2026-31849/ (Markdown: https://insights.sbomify.com/CVE-2026-31849/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-31849
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-31849
- OSV: https://osv.dev/vulnerability/CVE-2026-31849

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From sbomify Insights: https://insights.sbomify.com/CVE-2026-31849/
Summaries are generated and may contain mistakes; the official description above is the record.