CVE-2018-8378

What it is

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.

At a glance

Exploitability

Can be exploited locally on the machine without logging in, but needs a user to act. High risk of data exposure.

Exploit odds

7.3% chance of exploitation in the next 30 days (EPSS).

Fix

A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

1. 2018-08-15 17:29 UTC PublishedDisclosed publicly on CVE.org and NVD
2. 2026-06-17 02:04 UTC Last updatedMost recent change to the record

Why it ranks here

• Exploited in the wild: no, CISA does not list it.
• Exploit odds: 7.3% in the next 30 days (EPSS).
• Severity: 5.5 MEDIUM (CVSS).
• Fix: a patch or advisory is linked.

Details

Published

2018-08-15 17:29 UTC

Last modified

2026-06-17 02:04 UTC

Exploit probability

7.3% · EPSS, next 30 days

Weakness

CWE-125 · Out-of-bounds read

Record status

Modified

Affected

• Microsoft Excel Viewer 2007
• Microsoft Office 2010
• Microsoft Office 2013
• Microsoft Office 2016
• Microsoft Office Compatibility Pack
• Microsoft Office Web Apps 2010
• Microsoft Office Web Apps 2013
• Microsoft Office Word Viewer

Attack profile CVSS 3.0 · 5.5

Attack vector

Local

Complexity

Low

Privileges needed

None

User interaction

Required

Scope

Unchanged

Confidentiality

High

Integrity

None

Availability

None

Is it in your code?

Hand this to your coding agent. It searches your project for the affected products and checks versions. Nothing leaves your machine.

Read https://cve-list.com/agent/cve/CVE-2018-8378.md and follow it. Check whether this project is affected by CVE-2018-8378. Read only. Don't change anything and don't upload my code. Tell me yes, no or not sure, with the file as proof.

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