CVE-2020-1025

critical Microsoft
CVSS v3 Base Score
9.8
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS Score
13.8%
Exploitation probability in 30 days
Top 6% most likely to be exploited
Attack Characteristics
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Confidentiality
High
Integrity
High
Availability
High
Published: July 14, 2020 (2130 days ago)
Last Modified: February 23, 2026
Vendor: Microsoft

Description

An elevation of privilege vulnerability exists when Microsoft SharePoint Server and Skype for Business Server improperly handle OAuth token validation. An attacker who successfully exploited the vulnerability could bypass authentication and achieve improper access. To exploit this vulnerability, an attacker would need to modify the token. The update addresses the vulnerability by modifying how Microsoft SharePoint Server and Skype for Business Server validate tokens.

CWE

CWE-20

Affected Products

microsoft lyncmicrosoft sharepoint enterprise servermicrosoft sharepoint foundationmicrosoft sharepoint servermicrosoft skype for business

References

🔗 portal.msrc.microsoft.com 🔗 portal.msrc.microsoft.com