# CVE-2026-5251: z-9527 admin User Update Endpoint user.js dynamically-determined object attributes

> Attackers can escalate privileges to admin by manipulating the isAdmin argument in the user update endpoint of z-9527 admin.

- **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:** 1 Apr 2026
- **Updated:** 1 Apr 2026
- **Also known as:** GHSA-vwp7-r9vq-p5wq

## What is CVE-2026-5251?

CVE-2026-5251 is a medium-severity vulnerability in z-9527 admin, published on 1 Apr 2026. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

A vulnerability was identified in z-9527 admin 1.0/2.0. This impacts an unknown function of the file /server/routes/user.js of the component User Update Endpoint. Such manipulation of the argument isAdmin with the input 1 leads to dynamically-determined object attributes. It is possible to launch the attack remotely. The exploit is publicly available and might be used. The vendor was contacted early about this disclosure but did not respond in any way.

Weakness: CWE-915 (Improperly Controlled Modification of Dynamically-Determined Object Attributes), CWE-913 (Improper Control of Dynamically-Managed Code Resources)

## Which versions are affected by CVE-2026-5251?


## How do I fix CVE-2026-5251?

No fix has been published for CVE-2026-5251 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-5251 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-5251 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-5251 and fix it if it is affected.

What it is: CVE-2026-5251 is a medium-severity vulnerability in z-9527 admin, published on 1 Apr 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-2026-5251 exists.

Affected product: z-9527 admin. 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-2026-5251/ (Markdown: https://insights.sbomify.com/CVE-2026-5251/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-5251
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-5251
- OSV: https://osv.dev/vulnerability/CVE-2026-5251

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-5251/
Summaries are generated and may contain mistakes; the official description above is the record.