# CVE-2022-50898: NanoCMS 0.4 - Remote Code Execution (RCE) (Authenticated)

> Authenticated attackers can upload malicious PHP files to NanoCMS to achieve remote code execution on the server.

- **Severity:** High 8.6 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N`)
- **Exploited in the wild:** Not known
- **Login needed:** An administrator
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 13 Jan 2026
- **Updated:** 29 Jan 2026
- **Also known as:** GHSA-534f-4cxm-43gw

## What is CVE-2022-50898?

CVE-2022-50898 is a high-severity vulnerability in kalyan02 NanoCMS, published on 13 Jan 2026. An attacker needs administrator access to exploit it, with no action from the victim.

### Official description

NanoCMS 0.4 contains an authenticated file upload vulnerability that allows remote code execution through unvalidated page content creation. Authenticated attackers can upload PHP files with arbitrary code to the server's pages directory by exploiting the page creation mechanism without proper input sanitization.

Weakness: CWE-434 (Unrestricted Upload of File with Dangerous Type)

## Which versions are affected by CVE-2022-50898?

It affects 1 product.


Products: Kalyan02 Nanocms.

## How do I fix CVE-2022-50898?

No fix has been published for CVE-2022-50898 yet. Limit exposure of the affected software until one is available.

## Is CVE-2022-50898 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2022-50898 exists.

## Other vulnerabilities in kalyan02 NanoCMS

- [CVE-2026-1978](https://insights.sbomify.com/CVE-2026-1978/): kalyan02 NanoCMS User Information pagesdata.txt direct request (medium 6.9)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2022-50898 and fix it if it is affected.

What it is: CVE-2022-50898 is a high-severity vulnerability in kalyan02 NanoCMS, published on 13 Jan 2026. An attacker needs administrator access to exploit it, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2022-50898 exists.

Affected product: kalyan02 NanoCMS. 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-2022-50898/ (Markdown: https://insights.sbomify.com/CVE-2022-50898/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2022-50898
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2022-50898
- OSV: https://osv.dev/vulnerability/CVE-2022-50898

---
From sbomify Insights: https://insights.sbomify.com/CVE-2022-50898/
Summaries are generated and may contain mistakes; the official description above is the record.