# CVE-2026-7791: Local Privilege Escalation via TOCTOU Race Condition in Amazon WorkSpaces Skylight Agent

> A local non-admin user can escalate privileges to SYSTEM by exploiting improper privilege management in the log rotation mechanism of Amazon WorkSpaces for Windows.

- **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:** 4 May 2026
- **Updated:** 20 Oct 2026
- **Also known as:** GHSA-rp3m-v2vr-fvq8

## What is CVE-2026-7791?

CVE-2026-7791 is a high-severity vulnerability in Amazon Workspaces, published on 4 May 2026. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

Improper privilege management in the log rotation mechanism of the Skylight Workspace Config Service in Amazon WorkSpaces for Windows before 2.6.2034.0 allows a local non-admin authenticated user to place arbitrary files into arbitrary locations bypassing file system permission protections, leading to local privilege escalation to SYSTEM.

Weakness: CWE-367 (Time-of-check Time-of-use (TOCTOU) Race Condition)

## Which versions are affected by CVE-2026-7791?


## How do I fix CVE-2026-7791?

No fix has been published for CVE-2026-7791 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-7791 being exploited?

There is no known exploitation of CVE-2026-7791 in the wild and no public exploit code.

Public exploit code:

- Local Privilege Escalation in Amazon WorkSpaces via TOCTOU and Arbitrary File Write (github_poc): https://github.com/BenZamir/CVE-2026-7791

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-7791 and fix it if it is affected.

What it is: CVE-2026-7791 is a high-severity vulnerability in Amazon Workspaces, published on 4 May 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-2026-7791 in the wild and no public exploit code.

Affected product: Amazon Workspaces. 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-2026-7791/ (Markdown: https://insights.sbomify.com/CVE-2026-7791/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-7791
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-7791
- OSV: https://osv.dev/vulnerability/CVE-2026-7791

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-7791/
Summaries are generated and may contain mistakes; the official description above is the record.