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CVE-2020-1523: Microsoft SharePoint Server Tampering Vulnerability

• Severity: medium (CVSS 4.0 v2.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 2.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2020-09-11 · updated 2026-06-17

Description

<p>A tampering vulnerability exists when Microsoft SharePoint Server fails to properly handle profile data. An attacker who successfully exploited this vulnerability could modify a targeted user's profile data.</p> <p>To exploit the vulnerability, an attacker would need to be authenticated on an affected SharePoint Server. The attacker would then need to send a specially modified request to the server, targeting a specific user.</p> <p>The security update addresses the vulnerability by modifying how Microsoft SharePoint Server handles profile data.</p>

Affected products

• Microsoft SharePoint Server: 2019
• Microsoft SharePoint Server: from 16.0.0 before publication — fixed in publication

How to fix

Upgrade to a fixed version: Microsoft SharePoint Server publication. Check the vendor advisory for mitigations.

References

• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-1523
• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-1523

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