CVE-2018-8378
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…
Does this matter?
Lower severity and a low EPSS score (7.31%). Track it; it rarely justifies an emergency change on its own.
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
- 5.5 MEDIUMCVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
- EPSS
- 7.31% probability · 94th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-125, CWE-908
- Affected
- microsoft/excel viewer · microsoft/office · microsoft/office compatibility pack · microsoft/office web apps · microsoft/office word viewer · microsoft/sharepoint enterprise server 2013 · microsoft/sharepoint enterprise server 2016 · microsoft/sharepoint server · microsoft/word automation services
- Source
- secure@microsoft.com
EPSS moved from 5.7% on 21 September 2026 to 7.3% on 27 October 2026, peaking at 8.2% on 22 September 2026. The dashed line is the ten per cent mark our analysts treat as “patch before the next change window”.
References
- http://www.securityfocus.com/bid/104996Third Party Advisory, VDB Entry
- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2018-8378Patch, Vendor Advisory
- http://www.securityfocus.com/bid/104996Third Party Advisory, VDB Entry
- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2018-8378Patch, Vendor Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.