Description of the security update for SharePoint Server Subscription Edition: June 9, 2026 (KB5002873)

None None...

PT-2026-58524

Name of the Vulnerable Software and Affected Versions Microsoft Office SharePoint affected versions not specified Description Improper neutralization of input during web page generation leads to a cross-site scripting issue. This allows an authorized attacker to perform spoofing over a network,...

PT-2026-58556

Name of the Vulnerable Software and Affected Versions Microsoft Office SharePoint affected versions not specified Description Missing authorization allows an authorized attacker to elevate privileges over a network, which enables them to affect the system. Recommendations At the moment, there is ...

PT-2026-58539

Name of the Vulnerable Software and Affected Versions Microsoft Office SharePoint affected versions not specified Description Improper neutralization of input during web page generation leads to a cross-site scripting issue, which allows an authorized attacker to perform spoofing over a network...

PT-2026-58045

Name of the Vulnerable Software and Affected Versions Microsoft Office SharePoint affected versions not specified Description Weaknesses in the validation of JSON Web Tokens JWTs allow a remote, unauthenticated attacker to bypass authentication checks. By knowing or enumerating a target user's...

PT-2026-58569

Name of the Vulnerable Software and Affected Versions Microsoft Office SharePoint affected versions not specified Description Improper neutralization of input during web page generation leads to a cross-site scripting issue, which allows an authorized attacker to perform spoofing over a network...

PT-2026-58555

Name of the Vulnerable Software and Affected Versions Microsoft Office SharePoint affected versions not specified Description A server-side request forgery SSRF issue exists in Microsoft Office SharePoint. This flaw allows an authorized attacker to disclose sensitive information over a network...

PT-2026-58639

Name of the Vulnerable Software and Affected Versions Microsoft Office SharePoint affected versions not specified Description Improper authorization allows an authorized attacker to elevate privileges over a network, enabling them to affect the system. Recommendations At the moment, there is no...

PT-2026-58284

Name of the Vulnerable Software and Affected Versions Microsoft SharePoint Enterprise Server 2016 versions prior to 16.0.5556.1005 Microsoft SharePoint Server 2019 versions prior to 16.0.10417.20153 Microsoft SharePoint Server Subscription Edition versions prior to 16.0.19725.20384 Description Th...

PT-2026-58260

Name of the Vulnerable Software and Affected Versions Microsoft SharePoint Server affected versions not specified Microsoft SharePoint Server Subscription Edition affected versions not specified Microsoft SharePoint Enterprise Server affected versions not specified Description Missing...

PT-2026-58592

Name of the Vulnerable Software and Affected Versions Microsoft Office SharePoint affected versions not specified Description Improper access control allows an authorized attacker to perform spoofing over a network, which enables them to affect the system. Recommendations At the moment, there is ...

PT-2026-58525

Name of the Vulnerable Software and Affected Versions Microsoft Office SharePoint affected versions not specified Description Improper neutralization of input during web page generation leads to cross-site scripting, which allows an authorized attacker to perform spoofing over a network...

PT-2026-58526

Name of the Vulnerable Software and Affected Versions Microsoft Office SharePoint affected versions not specified Description Improper neutralization of input during web page generation leads to a cross-site scripting issue, which allows an authorized attacker to perform spoofing over a network...

Microsoft SharePoint Server - Authentication Bypass (ToolShell)

Microsoft Office SharePoint Server contains an improper authentication vulnerability that allows unauthorized attackers to perform spoofing over a network. By crafting a POST request to /layouts/15/ToolPane.aspx with a forged Referer header /layouts/SignOut.aspx, attackers can bypass authenticati...

Microsoft SharePoint Server - Remote Code Execution (ToolShell)

Deserialization of untrusted data in on-premises Microsoft SharePoint Server allows an unauthorized attacker to execute code over a network. This vulnerability is part of the ToolShell exploit chain and when combined with CVE-2025-53771 authentication bypass, enables unauthenticated remote code...

CVE-2025-53828

SharePoint for ownCloud is an application for using SharePoint with the file storage, synchronization, and sharing application ownCloud Classic. In SharePoint for ownCloud prior to version 0.4.1, which corresponds to ownCloud 10 prior to 10.15.3, an attacker with administrative privileges can use...

CVE-2025-53828

SharePoint for ownCloud is an application for using SharePoint with the file storage, synchronization, and sharing application ownCloud Classic. In SharePoint for ownCloud prior to version 0.4.1, which corresponds to ownCloud 10 prior to 10.15.3, an attacker with administrative privileges can use...

CVE-2025-53828

CVE-2025-53828 describes a SSRF vulnerability in SharePoint for ownCloud prior to 0.4.1 (affecting ownCloud 10 prior to 10.15.3). An attacker with administrative privileges can trigger SSRF to execute arbitrary code on the system. The fixed version is SharePoint for ownCloud 0.4.1, delivered with...

CVE-2025-53828 SharePoint for ownCloud 10 is vulnerable to Server-Side Request Forgery (SSRF)

SharePoint for ownCloud is an application for using SharePoint with the file storage, synchronization, and sharing application ownCloud Classic. In SharePoint for ownCloud prior to version 0.4.1, which corresponds to ownCloud 10 prior to 10.15.3, an attacker with administrative privileges can use...

PT-2026-55939

Name of the Vulnerable Software and Affected Versions SharePoint for ownCloud versions prior to 0.4.1 ownCloud 10 versions prior to 10.15.3 Description An attacker with administrative privileges can exploit a Server-Side Request Forgery SSRF in the SharePoint app to execute arbitrary code on the...