CVE-2020-16952

Microsoft SharePoint Remote Code Execution Vulnerability

CVSS 3.1 High 8.6

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:L/E:P/RL:O/RC:C

Description

A remote code execution vulnerability exists in Microsoft SharePoint when the software fails to check the source markup of an application package. An attacker who successfully exploited the vulnerability could run arbitrary code in the context of the SharePoint application pool and the SharePoint server farm account. Exploitation of this vulnerability requires that a user uploads a specially crafted SharePoint application package to an affected version of SharePoint. The security update addresses the vulnerability by correcting how SharePoint checks the source markup of application packages.

Key data

CVSS 3.1 High 8.6

Score published by microsoft in the CVE record.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:L/E:P/RL:O/RC:C

Attack vector: Network
The vulnerable component can be reached over a network, possibly from the Internet.
Attack complexity: Low
No special conditions are needed. The attack can be repeated at will.
Privileges required: None
No account or privileges are needed.
User interaction: None
No action from any user is needed.
Scope: Unchanged
The impact stays within the vulnerable component.
Confidentiality impact: Low
Limited effect on the secrecy of data.
Integrity impact: High
Serious or total effect on the trustworthiness of data.
Availability impact: Low
Limited effect on availability.

Metric	Value	What it means
Attack vector	Network	The vulnerable component can be reached over a network, possibly from the Internet.
Attack complexity	Low	No special conditions are needed. The attack can be repeated at will.
Privileges required	None	No account or privileges are needed.
User interaction	None	No action from any user is needed.
Scope	Unchanged	The impact stays within the vulnerable component.
Confidentiality impact	Low	Limited effect on the secrecy of data.
Integrity impact	High	Serious or total effect on the trustworthiness of data.
Availability impact	Low	Limited effect on availability.

CVSS is owned and managed by FIRST.Org, Inc. (FIRST) and is used by permission. Each CVSS score on this site is shown together with its vector string, as published in the CVE record by the source named next to it. Learn more at first.org/cvss.

EPSS

Exploit Prediction Scoring System by FIRST: an estimate of the probability that exploitation activity will be observed in the next 30 days.

Score: 0.71095 (71.1% probability)
Percentile: 99.4%
Scores of: Nov 10, 2026
Model: v2026.06.15

Affected products

Products listed in the CVE record, as the CNA published them.

Microsoft SharePoint Enterprise Server 2016
- affected: 16.0.0 up to before publication
Microsoft SharePoint Server 2019
- affected: 16.0.0 up to before publication
Microsoft SharePoint Foundation 2013 Service Pack 1
- affected: 15.0.0 up to before publication

References

Links listed in the CVE record. They lead to other sites, which CubePath does not control.

Timeline

ID reservedAug 4, 2020
Record publishedOct 16, 2020
Record last updatedAug 4, 2024

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Data from the CVE Program (MITRE), CISA KEV and FIRST EPSS. CVSS is owned by FIRST and used by permission. Not affiliated with or endorsed by MITRE, CISA or FIRST. Data as of Nov 10, 2026, 19:50 UTC. Sources and licenses