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Privacy Statement Third-Party Cookies AcceptRejectManage cookies MSRC  Customer Guidance  Security Update Guide  Vulnerabilities  CVE-2026-56157 Microsoft SharePoint Server Spoofing Vulnerability New On this page  CVE-2026-56157  Subscribe RSS PowerShell  API  CSAF Security Vulnerability Released: Jul 14, 2026 Assigning CNA Microsoft CVE.org link CVE-2026-56157  Impact Spoofing Max Severity Important Weakness CWE-284: Improper Access Control CVSS Source Microsoft Vector String CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N/E:U/RL:O/RC:C Metrics CVSS:3.1 5.4 / 4.7  Base score metrics: 5.4 / Temporal score metrics: 4.7  Expand all  Collapse all Metric Value   Base score metrics(8) Attack Vector Network Attack Complexity Low Privileges Required Low User Interaction None Scope Unchanged Confidentiality Low Integrity Low Availability None   Temporal score metrics(3) Exploit Code Maturity Unproven Remediation Level Official Fix Report Confidence Confirmed Please see Common Vulnerability Scoring System for more information on the definition of these metrics. Executive Summary Improper access control in Microsoft Office SharePoint allows an authorized attacker to perform spoofing over a network. Exploitability The following table provides an exploitability assessment for this vulnerability at the time of original publication. Publicly disclosed No Exploited No Exploitability assessment Exploitation Less Likely FAQ I am running SharePoint Server 2016. Do the updates for SharePoint Enterprise Server 2016 also apply to the version I am running? Yes. The same KB number applies to both SharePoint Server 2016 and SharePoint Enterprise Server 2016. Customers running either version should install the security update to be protected from this vulnerability. According to the CVSS metrics, successful exploitation of this vulnerability could lead to some loss of confidentiality (C:L), and integrity (I:L) but lead to no loss of availability (A:N). What is the impact of this vulnerability? An attacker who successfully exploited the vulnerability could view some sensitive information (Confidentiality), make changes to disclosed information (Integrity), but cannot limit access to the resource (Availability). Acknowledgements Microsoft recognizes the efforts of those in the security community who help us protect customers through coordinated vulnerability disclosure. See Acknowledgements for more information. Security Updates To determine the support lifecycle for your software, see the Microsoft Support Lifecycle. Release date Descending  Edit columns  Download  Filters  Product Family  Max Severity  Impact  Platform   Clear Release date  Product Platform Impact Max Severity Article Download Build Number Assigning CNA Title: Release date, Content: Jul 14, 2026 Microsoft SharePoint Server Subscription Edition - Spoofing Important Title: Knowledge Base Articles for Microsoft SharePoint Server Subscription Edition, Content:, 1 link 5002882  Title: Download Security Update for Microsoft SharePoint Server Subscription Edition, Content:, 1 link Security Update  Title: Build numbers, Content: 16.0.19725.20434 Title: Assigning CNA, Content: Microsoft Title: Release date, Content: Jul 14, 2026 Microsoft SharePoint Server 2019 - Spoofing Important Title: Knowledge Base Articles for Microsoft SharePoint Server 2019, Content:, 1 link 5002883  Title: Download Security Update for Microsoft SharePoint Server 2019, Content:, 1 link Security Update  Title: Build numbers, Content: 16.0.10417.20175 Title: Assigning CNA, Content: Microsoft Title: Release date, Content: Jul 14, 2026 Microsoft SharePoint Enterprise Server 2016 - Spoofing Important Title: Knowledge Base Articles for Microsoft SharePoint Enterprise Server 2016, Content:, 1 link 5002891  Title: Download Security Update for Microsoft SharePoint Enterprise Server 2016, Content:, 1 link Security Update  Title: Build numbers, Content: 16.0.5561.1001 Title: Assigning CNA, Content: Microsoft All results loaded Loaded all 3 rows Disclaimer The information provided in the Microsoft Knowledge Base is provided "as is" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply. Revisions version revisionDate description 1.0 Jul 14, 2026 Information published.  How satisfied are you with the MSRC Security Update Guide? Rating  Broken  Bad  Below average  Average  Great!  Your Privacy Choices Consumer Health Privacy Privacy & Cookies