# Office Excel Viewer vulnerabilities > Office Excel Viewer is made by Microsoft. We track 29 published vulnerabilities in it, across 1 version. 2 of them are on the list of flaws known to be exploited, the newest added on 14 April 2026. If you run Office Excel Viewer, check your version against the exploited flaws below and patch those first. Canonical page: https://www.precursorintelligence.com/product/microsoft/office_excel_viewer ## At a glance - **Made by:** [Microsoft](https://www.precursorintelligence.com/vendors/microsoft) - **Published vulnerabilities:** 29 - **Known to be exploited:** 2 - **Versions tracked:** 1 - **Most recently added to the known-exploited list:** [CVE-2009-0238](https://www.precursorintelligence.com/what-is/cve-2009-0238), 14 April 2026. We keep watching the list. ## Which versions of Office Excel Viewer do the exploited flaws hit? Each exploited flaw lists the versions it affects, as published. - [CVE-2009-0238](https://www.precursorintelligence.com/what-is/cve-2009-0238) (Microsoft Office Remote Code Execution): all versions, 2003-sp3 - [CVE-2009-0557](https://www.precursorintelligence.com/what-is/cve-2009-0557) (Microsoft Office Object Record Corruption Vulnerability): 2003-sp3 ## Which Office Excel Viewer vulnerabilities are being exploited? 2 flaws are on the government list of vulnerabilities known to be exploited, newest first: - [CVE-2009-0238](https://www.precursorintelligence.com/what-is/cve-2009-0238): Microsoft Office Remote Code Execution. High, CVSS 8.8, chance of use in 30 days 43%, known exploited since 14 April 2026. - [CVE-2009-0557](https://www.precursorintelligence.com/what-is/cve-2009-0557): Microsoft Office Object Record Corruption Vulnerability. High, CVSS 7.8, chance of use in 30 days 53%, known exploited since 8 June 2022. ## Which Office Excel Viewer flaws are most likely to be used? Ranked by the latest exploit-likelihood forecast (the chance each flaw is used in an attack in the next 30 days): - [CVE-2009-0238](https://www.precursorintelligence.com/what-is/cve-2009-0238): 43%, High (CVSS 8.8), known exploited - [CVE-2009-1134](https://www.precursorintelligence.com/what-is/cve-2009-1134): 36%, Critical (CVSS 9.3) - [CVE-2009-0558](https://www.precursorintelligence.com/what-is/cve-2009-0558): 31%, Critical (CVSS 9.3) - [CVE-2009-0559](https://www.precursorintelligence.com/what-is/cve-2009-0559): 29%, Critical (CVSS 9.3) ## Questions ### How many vulnerabilities does Office Excel Viewer have? We track 29 published vulnerabilities listed under the name Office Excel Viewer, across 1 version. The most recent Office Excel Viewer flaw added to the known-exploited list is CVE-2009-0238, on 14 April 2026. ### Which Office Excel Viewer vulnerabilities are being exploited? 2 are on the list of flaws known to be exploited. The most recently added are CVE-2009-0238 and CVE-2009-0557. ### Which versions of Office Excel Viewer do the exploited flaws affect? Each flaw names its own versions, usually as ranges. The newest, CVE-2009-0238, affects all versions, 2003-sp3. The versions for every exploited flaw are listed on this page. ### How do I get alerts for Office Excel Viewer? Create a Precursor Intelligence account and track Office Excel Viewer. We match it against every published flaw, give each one a risk score from 0 to 100 and keep watching, so you hear about new ones as soon as we know, by email, in the app or by webhook. ## Running Office Excel Viewer? Precursor Intelligence keeps checking for you: - **Tell us what you run.** Pick your software from a list, or let us work it out from your website. - **We match it to every flaw.** Over 400,000 published flaws, checked against your list. - **Ranked by real-world risk.** Every flaw gets a 0 to 100 risk score, kept up to date, led by evidence criminals are using it. - **Told as soon as we know.** An alert by email, in the app or by webhook to your own tools. Start free (no card, nothing to install): https://www.precursorintelligence.com/register Book a demo: https://www.precursorintelligence.com/contact