# CVE-2026-2556: cskefu Endpoint MediaController.java server-side request forgery

> Remote attackers can exploit a server-side request forgery vulnerability in cskefu to access internal resources or bypass security controls.

- **Severity:** Medium 5.3 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 16 Feb 2026
- **Updated:** 23 Feb 2026
- **Also known as:** GHSA-89wr-3g6x-pxxx

## What is CVE-2026-2556?

CVE-2026-2556 is a medium-severity server-side request forgery vulnerability in cskefu, published on 16 Feb 2026. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

A security vulnerability has been detected in cskefu up to 8.0.1. This issue affects some unknown processing of the file com/cskefu/cc/controller/resource/MediaController.java of the component Endpoint. The manipulation of the argument url leads to server-side request forgery. The attack may be initiated remotely. The exploit has been disclosed publicly and may be used. The vendor was contacted early about this disclosure but did not respond in any way.

Weakness: CWE-918 (Server-Side Request Forgery)

## Which versions are affected by CVE-2026-2556?

It affects 1 product.


Products: Cskefu Cskefu.

## How do I fix CVE-2026-2556?

No fix has been published for CVE-2026-2556 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-2556 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-2556 exists.

## Other vulnerabilities in cskefu

- [CVE-2022-36521](https://insights.sbomify.com/CVE-2022-36521/): Missing authorization in n/a (high 7.5)
- [CVE-2026-2557](https://insights.sbomify.com/CVE-2026-2557/): cskefu File Upload MediaController.java upload cross site scripting (medium 5.1)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-2556 and fix it if it is affected.

What it is: CVE-2026-2556 is a medium-severity server-side request forgery vulnerability in cskefu, published on 16 Feb 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-2556 exists.

Affected product: cskefu. 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-2026-2556/ (Markdown: https://insights.sbomify.com/CVE-2026-2556/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-2556
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-2556
- OSV: https://osv.dev/vulnerability/CVE-2026-2556

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-2556/
Summaries are generated and may contain mistakes; the official description above is the record.