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CVE-2021-1718: Microsoft SharePoint Server Tampering Vulnerability

• Severity: medium (CVSS 6.5 v2.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 2.8% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-01-12 · updated 2026-06-17

Description

Microsoft SharePoint Server Tampering Vulnerability

Affected products

• Microsoft SharePoint Foundation 2013 Service Pack 1: 2010-sp2
• Microsoft SharePoint Foundation 2013 Service Pack 1: from 13.0.0 before publication — fixed in publication

How to fix

Upgrade to a fixed version: Microsoft SharePoint Foundation 2013 Service Pack 1 publication. Check the vendor advisory for mitigations.

References

• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-1718
• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-1718

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