# CVE-2018-8598: Microsoft Excel Information Disclosure Vulnerability

CVE-2018-8598 is fixed in 7 products on 1 platform, first by KB4461577, released December 11, 2018. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2018-8598
- Priority: High
- CVSS: n/a (Important)
- EPSS: 0.0622
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Vendor exploitability assessment: Exploitation Less Likely
- Published: Dec 11, 2018
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2018-8598

## Description

<p>An information disclosure vulnerability exists when Microsoft Excel improperly discloses the contents of its memory. An attacker who exploited the vulnerability could use the information to compromise the user’s computer or data.</p> <p>To exploit the vulnerability, an attacker could craft a special document file and then convince the user to open it. An attacker must know the memory address location where the object was created.</p> <p>The update addresses the vulnerability by changing the way certain Excel functions handle objects in memory.</p>

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Microsoft | Microsoft Excel 2010 Service Pack 2 (32-bit editions) |  | [KB4461577](https://patchblox.com/security/data/fix/microsoft/kb4461577.md) | Dec 11, 2018 |
| Microsoft | Microsoft Excel 2010 Service Pack 2 (64-bit editions) |  | [KB4461577](https://patchblox.com/security/data/fix/microsoft/kb4461577.md) | Dec 11, 2018 |
| Microsoft | Microsoft Excel 2013 RT Service Pack 1 |  | [KB4461559](https://patchblox.com/security/data/fix/microsoft/kb4461559.md) | Dec 11, 2018 |
| Microsoft | Microsoft Excel 2013 Service Pack 1 (32-bit editions) |  | [KB4461559](https://patchblox.com/security/data/fix/microsoft/kb4461559.md) | Dec 11, 2018 |
| Microsoft | Microsoft Excel 2013 Service Pack 1 (64-bit editions) |  | [KB4461559](https://patchblox.com/security/data/fix/microsoft/kb4461559.md) | Dec 11, 2018 |
| Microsoft | Microsoft Excel 2016 (32-bit edition) |  | [KB4461542](https://patchblox.com/security/data/fix/microsoft/kb4461542.md) | Dec 11, 2018 |
| Microsoft | Microsoft Excel 2016 (64-bit edition) |  | [KB4461542](https://patchblox.com/security/data/fix/microsoft/kb4461542.md) | Dec 11, 2018 |

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Data as of 2026-11-07T18:46:35Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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