Advisory Details

July 25th, 2025

(Pwn2Own) Microsoft SharePoint ToolPane Authentication Bypass Vulnerability

ZDI-25-652
ZDI-CAN-27790

CVE ID CVE-2025-53771
CVSS SCORE 6.5, AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
AFFECTED VENDORS Microsoft
AFFECTED PRODUCTS SharePoint
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
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