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Vulnerability record · CVE-2018-8378 · published 15 August 2018

CVE-2018-8378: Microsoft excel viewer out-of-bounds read vulnerability

Microsoft · Excel Viewer

An information disclosure vulnerability exists when Microsoft Office software reads out of bound memory due to an uninitialized variable, which could disclose the contents of memory, aka "Microsoft Office Information Disclosure Vulnerability." This affects Word, Microsoft SharePoint Server, Microsoft Office Word Viewer, Microsoft Excel Viewer, Microsoft SharePoint, Microsoft Office.

5.5 CVSS 3.0 Medium EPSS 8.2% · top 5.3% CWE-125 · Out-of-bounds readCWE-908 · Use of uninitialized resource
5.5CVSS 3.0 base score, v2 4.3
8.2%EPSS exploitation probability, 30 days
NoNot in CISA KEV
9Affected product versions listed by NVD
4References
17 Jun 2026Last modified by NVD

Description

An information disclosure vulnerability exists when Microsoft Office software reads out of bound memory due to an uninitialized variable, which could disclose the contents of memory, aka "Microsoft Office Information Disclosure Vulnerability." This affects Word, Microsoft SharePoint Server, Microsoft Office Word Viewer, Microsoft Excel Viewer, Microsoft SharePoint, Microsoft Office.

CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N

Affected products

9 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://www.securityfocus.com/bid/104996 Third Party AdvisoryVDB Entry
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2018-8378 PatchVendor Advisory
http://www.securityfocus.com/bid/104996 Third Party AdvisoryVDB Entry
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2018-8378 PatchVendor Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2018-8378), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.