Microsoft Office Code Injection From 2009 Added to CISA's Known Exploited Vulnerabilities Catalog with an April 28th Federal Deadline That Has Since Passed

Last refreshed2026-09-27

Status: KEV | Advisory ID: CVE-2009-0238

Key Details

CVE	CVE-2009-0238
Vulnerability Name	Microsoft Office Remote Code Execution
Affected products	Microsoft Office
Exploitation status	Listed in CISA's Known Exploited Vulnerabilities (KEV) catalog, indicating confirmed active exploitation.
Classified as	CWE-94 (Improper Control of Generation of Code ('Code Injection'))
KEV listing	Added to CISA's Known Exploited Vulnerabilities (KEV) catalog on 2026-04-14.
Exploitation prediction (EPSS)	43.21% probability of exploitation in the next 30 days (99% percentile) -- FIRST.org's EPSS model.
Federal remediation deadline	2026-04-28 (CISA KEV, Binding Operational Directive).

Affected Products, Subsystems & Sectors

Vendor	Product	Affected Versions	Patch Status
Microsoft	Office

Vendor

Product

Affected Versions

Patch Status

Microsoft

Office

Subsystems	General OT
Sectors	Multiple

What to Know

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.

What to Do

Monitor Microsoft's web page for any future patch releases.

References

Source	Reference
NVD	https://nvd.nist.gov/vuln/detail/CVE-2009-0238
CVE	https://www.cve.org/CVERecord?id=CVE-2009-0238

Source

Reference

NVD

https://nvd.nist.gov/vuln/detail/CVE-2009-0238

CVE

https://www.cve.org/CVERecord?id=CVE-2009-0238

KEV Required Action

Field	Value
KEV Link	https://www.cisa.gov/known-exploited-vulnerabilities-catalog
Date Added to KEV	2026-04-14
Required Action Due Date	2026-04-28
Required Action	Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

Field

Value

KEV Link

https://www.cisa.gov/known-exploited-vulnerabilities-catalog

Date Added to KEV

2026-04-14

Required Action Due Date

2026-04-28

Required Action

Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.