# CVE-2026-40058: Vulnerability Affecting Office Macro Removal in CrowdStrike Falcon Sensor for Windows

> A race condition in the Office Macro Removal feature allows unprivileged users to write arbitrary files to protected locations, leading to local privilege escalation.

- **Severity:** High 8.8 (`CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H`)
- **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:** 15 Sep 2026
- **Updated:** 15 Sep 2026
- **Also known as:** GHSA-437q-4cw6-qcwj

## What is CVE-2026-40058?

CVE-2026-40058 is a high-severity vulnerability in CrowdStrike Falcon sensor for Windows, published on 15 Sep 2026. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

CrowdStrike released a security update to address a vulnerability in the Falcon sensor for Windows. The vulnerability only exists when the Microsoft Office File Malicious Macro Removal Windows policy setting is enabled and customers remain protected through the Cloud Anti-malware for Microsoft Office Files settings.

An update is available immediately for versions 7.34 and above, 7.32 LTS, and 7.16 for Windows 7/2008 R2 systems. The Falcon sensor for Mac, Linux, and Legacy Systems are not affected. 

This vulnerability could expose an arbitrary file write to protected locations from an unprivileged context, potentially leading to local privilege escalation.

The CrowdStrike Laroux Malware Cleanup Tool, based off of the same feature in the CrowdStrike Falcon sensor for Windows, is also affected. An update for this tool is also available immediately.

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

## Which versions are affected by CVE-2026-40058?


## How do I fix CVE-2026-40058?

No fix has been published for CVE-2026-40058 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-40058 being exploited?

There is no known exploitation of CVE-2026-40058 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-40058 and fix it if it is affected.

What it is: CVE-2026-40058 is a high-severity vulnerability in CrowdStrike Falcon sensor for Windows, published on 15 Sep 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-2026-40058 in the wild and no public exploit code.

Affected product: CrowdStrike Falcon sensor 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-2026-40058/ (Markdown: https://insights.sbomify.com/CVE-2026-40058/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-40058
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-40058
- OSV: https://osv.dev/vulnerability/CVE-2026-40058

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From sbomify Insights: https://insights.sbomify.com/CVE-2026-40058/
Summaries are generated and may contain mistakes; the official description above is the record.