# CVE-2026-31272: Missing authorization in n/a

> Unauthenticated attackers can create super administrator accounts due to missing authorization checks in the user controller.

- **Severity:** Critical 9.8 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 7 Apr 2026
- **Updated:** 9 Apr 2026
- **Also known as:** GHSA-84xj-452r-299m

## What is CVE-2026-31272?

CVE-2026-31272 is a critical missing authorization vulnerability in n/a, published on 7 Apr 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

MRCMS 3.1.2 contains an access control vulnerability. The save() method in src/main/java/org/marker/mushroom/controller/UserController.java lacks proper authorization validation, enabling direct addition of super administrator accounts without authentication.

Weakness: CWE-284 (Improper Access Control)

## Which versions are affected by CVE-2026-31272?

It affects 1 product.


Products: Mrcms Mrcms.

## How do I fix CVE-2026-31272?

No fix has been published for CVE-2026-31272 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-31272 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-31272 exists.

## Other vulnerabilities in n/a

- [CVE-2024-48177](https://insights.sbomify.com/CVE-2024-48177/): SQL injection in n/a (high 8.8)
- [CVE-2024-24161](https://insights.sbomify.com/CVE-2024-24161/): Path traversal in n/a (high 7.5)
- [CVE-2024-25428](https://insights.sbomify.com/CVE-2024-25428/): SQL injection in n/a (medium 6.5)
- [CVE-2024-24160](https://insights.sbomify.com/CVE-2024-24160/): Cross-site scripting in n/a (medium 6.1)
- [CVE-2025-25768](https://insights.sbomify.com/CVE-2025-25768/): Code injection in n/a (medium 5.4)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-31272 and fix it if it is affected.

What it is: CVE-2026-31272 is a critical missing authorization vulnerability in n/a, published on 7 Apr 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-31272 exists.

Affected product: n/a. 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-2026-31272/ (Markdown: https://insights.sbomify.com/CVE-2026-31272/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-31272
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-31272
- OSV: https://osv.dev/vulnerability/CVE-2026-31272

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-31272/
Summaries are generated and may contain mistakes; the official description above is the record.