(Pwn2Own) Microsoft SharePoint ToolPane Authentication Bypass Vulnerability
July 25th, 2025
Vulnerability Details
This vulnerability allows remote attackers to bypass authentication on affected installations of Microsoft SharePoint. Authentication is not required to exploit this vulnerability.
The specific flaw exists within the ToolPane endpoint. The application does not adequately restrict access to a protected API. An attacker can leverage this vulnerability to bypass authentication on the system.
Additional Details
Microsoft has issued an update to correct this vulnerability. More details can be found at:
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-53771
Disclosure Timeline
- 2025-07-24 - Vulnerability reported to vendor
- 2025-07-25 - Coordinated public release of advisory
- 2025-07-25 - Advisory Updated
Credit
Viettel Cyber Security
