# CVE-2026-4623: DefaultFuction Jeson-Customer-Relationship-Management-System API Module System.php server-side request forgery

> Attackers can exploit a server-side request forgery vulnerability in the API module to access internal resources or bypass security controls.

- **Severity:** Medium 6.9 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 24 Mar 2026
- **Updated:** 24 Mar 2026
- **Also known as:** GHSA-qmvm-wg96-h753

## What is CVE-2026-4623?

CVE-2026-4623 is a medium-severity server-side request forgery vulnerability in DefaultFuction Jeson-Customer-Relationship-Management-System, published on 24 Mar 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

A security vulnerability has been detected in DefaultFuction Jeson-Customer-Relationship-Management-System up to 1b4679c4d06b90d31dd521c2b000bfdec5a36e00. This affects an unknown function of the file /api/System.php of the component API Module. The manipulation of the argument url leads to server-side request forgery. The attack can be initiated remotely. The exploit has been disclosed publicly and may be used. Continious delivery with rolling releases is used by this product. Therefore, no version details of affected nor updated releases are available. The identifier of the patch is f76e7123fe093b8675f88ec8f71725b0dd186310/98bd4eb07fa19d4f2c5228de6395580013c97476. It is suggested to install a patch to address this issue.

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

## Which versions are affected by CVE-2026-4623?


## How do I fix CVE-2026-4623?

No fix has been published for CVE-2026-4623 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-4623 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-4623 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-4623 and fix it if it is affected.

What it is: CVE-2026-4623 is a medium-severity server-side request forgery vulnerability in DefaultFuction Jeson-Customer-Relationship-Management-System, published on 24 Mar 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-2026-4623 exists.

Affected product: DefaultFuction Jeson-Customer-Relationship-Management-System. 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-2026-4623/ (Markdown: https://insights.sbomify.com/CVE-2026-4623/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-4623
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-4623
- OSV: https://osv.dev/vulnerability/CVE-2026-4623

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From sbomify Insights: https://insights.sbomify.com/CVE-2026-4623/
Summaries are generated and may contain mistakes; the official description above is the record.