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Vulnerability record · CVE-2020-1493 · published 17 August 2020

CVE-2020-1493: Microsoft 365 apps vulnerability

Microsoft · 365 Apps

An information disclosure vulnerability exists when attaching files to Outlook messages. This vulnerability could potentially allow users to share attached files such that they are accessible by anonymous users where they should be restricted to specific users. To exploit this vulnerability, an attacker would have to attach a file as a link to an email. The email could then be shared with individuals that should not have access to the files, ignoring the default organizational setting. The security update addresses the vulnerability by correcting how Outlook handles file attachment links.

5.5 CVSS 3.1 Medium EPSS 7.3% · top 5.8% CWE-922 · CWE-922
5.5CVSS 3.1 base score, v2 4.3
7.3%EPSS exploitation probability, 30 days
NoNot in CISA KEV
3Affected product versions listed by NVD
4References
17 Jun 2026Last modified by NVD

Description

An information disclosure vulnerability exists when attaching files to Outlook messages. This vulnerability could potentially allow users to share attached files such that they are accessible by anonymous users where they should be restricted to specific users. To exploit this vulnerability, an attacker would have to attach a file as a link to an email. The email could then be shared with individuals that should not have access to the files, ignoring the default organizational setting. The security update addresses the vulnerability by correcting how Outlook handles file attachment links.

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N

Affected products

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

References

LinkTags
http://packetstormsecurity.com/files/169960/Microsoft-Outlook-2019-16.0.12624.20424-Out-Of-Bounds-Read.html Third Party AdvisoryVDB Entry
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-1493 PatchVendor Advisory
http://packetstormsecurity.com/files/169960/Microsoft-Outlook-2019-16.0.12624.20424-Out-Of-Bounds-Read.html Third Party AdvisoryVDB Entry
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-1493 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-2020-1493), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.