# CVE-2026-8797: Privilege escalation in ExpressUpdate Agent for Windows

> A malicious user with local access can execute arbitrary code with SYSTEM privileges due to an access control flaw in the ExpressUpdate Agent.

- **Severity:** High 8.5 (`CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 26 Jun 2026
- **Updated:** 26 Jun 2026
- **Also known as:** GHSA-cxm7-54mf-pwwg

## What is CVE-2026-8797?

CVE-2026-8797 is a high-severity vulnerability in NEC Corporation ExpressUpdate Agent for Windows, published on 26 Jun 2026. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

An access control deficiency vulnerability exists in ExpressUpdate Agent for Windows. If a malicious user gains access to the product, arbitrary code could be executed with SYSTEM privileges.

Weakness: CWE-782 (Exposed IOCTL with Insufficient Access Control)

## Which versions are affected by CVE-2026-8797?


## How do I fix CVE-2026-8797?

No fix has been published for CVE-2026-8797 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-8797 being exploited?

There is no known exploitation of CVE-2026-8797 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-8797 and fix it if it is affected.

What it is: CVE-2026-8797 is a high-severity vulnerability in NEC Corporation ExpressUpdate Agent for Windows, published on 26 Jun 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-8797 in the wild and no public exploit code.

Affected product: NEC Corporation ExpressUpdate Agent for Windows. 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-2026-8797/ (Markdown: https://insights.sbomify.com/CVE-2026-8797/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-8797
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-8797
- OSV: https://osv.dev/vulnerability/CVE-2026-8797

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From sbomify Insights: https://insights.sbomify.com/CVE-2026-8797/
Summaries are generated and may contain mistakes; the official description above is the record.