CVE-2025-59245
CWE-502Published: November 20, 2025· Updated: Jun 17, 2026
Official Description
Microsoft SharePoint Online Elevation of Privilege Vulnerability
Risk Analysis
This critical elevation of privilege vulnerability affects Microsoft SharePoint Online, allowing an attacker to gain higher privileges within the system. With a CVSS score of 9.8, this flaw presents a severe risk of unauthorized access and control. The EPSS score is not available to assess exploitation likelihood.
No public exploits are currently known for this vulnerability. The attack is remotely exploitable over the network with low complexity.
Apply the latest security updates and patches for Microsoft SharePoint Online. Regularly review and audit permissions within SharePoint environments.
Technical Analysis
CVE-2025-59245 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.
The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.
A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 9.8.
From a weakness classification perspective (CWE-502): Insecure deserialization vulnerabilities allow attackers to inject malicious objects during deserialization, potentially enabling remote code execution.
CVSS v3.1 Vector Breakdown
Affected Vendors & Products
Exploit & PoC Resources
Official Patches & Advisories
All References (1)
Quick Facts
Related CVEs (CWE-502)
Recommended Actions
- →Apply vendor patches immediately
- →Monitor CVE-2025-59245 in threat intel feeds
- →Review IDS/IPS signatures for exploitation attempts