Microsoft Office Remote Code Execution

Microsoft Office

Microsoft Office Excel contains a remote code execution vulnerability that could allow an attacker to take complete control of an affected system if a user opens a specially crafted Excel file that includes a malformed object. Added to CISA KEV on 2026-04-14 (federal deadline 2026-04-28).

First seen: 14 Apr 2026
Last update: 14 Apr 2026, 12:00 UTC
Identifiers: CVE-2009-0238
Source: CISA KEV
On the menu as: Microsoft Office

Check this repository for exposure to one security incident from pwned.coffee. Report first, change nothing until I say so.

## Microsoft Office Remote Code Execution
Severity: high, exploited in the wild. Patch status: patched.
Affected: Microsoft Office
Ids: CVE-2009-0238

Microsoft Office Excel contains a remote code execution vulnerability that could allow an attacker to take complete control of an affected system if a user opens a specially crafted Excel file that includes a malformed object. Added to CISA KEV on 2026-04-14 (federal deadline 2026-04-28).

## Steps
1. This touches infrastructure (office). Look in terraform, ansible, cloud-init, Dockerfiles and docs for the product and version we run. If it isn't in the repo, say so and list what a human should check on the box.

## Report
A table: file, product or package, version in use, affected yes/no, exact fix. Then anything a human has to check outside the repo.

If you have the pwned.coffee MCP server (https://pwned.coffee/mcp), call lookup_cve("CVE-2009-0238") for the latest, and check_repo with this repo's lockfiles, Dockerfiles and workflows for a full receipt.
Sources: https://learn.microsoft.com/en-us/security-updates/securitybulletins/2009/ms09-009 https://nvd.nist.gov/vuln/detail/CVE-2009-0238
https://pwned.coffee/i/microsoft-office-remote-code-execution-cve-2009-0238

Sources

Totalone hot coffee