CVE-2025-59245 Microsoft SharePoint Online Elevation of Privilege Vulnerability
An attacker can exploit a deserialization flaw in SharePoint Online to escalate privileges within the cloud service.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2025-59245?
CVE-2025-59245 is a critical unsafe deserialization vulnerability in Microsoft SharePoint Online, published on 20 Nov 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Microsoft SharePoint Online Elevation of Privilege Vulnerability
Weakness: CWE-502
Which versions are affected by CVE-2025-59245?
It affects 1 product.
Products include Microsoft Sharepoint Online.
How do I fix CVE-2025-59245?
No fix has been published for CVE-2025-59245 yet. Limit exposure of the affected software until one is available.
Upgrade, and only deserialise data from trusted sources or with an allow-list of types. More about Unsafe deserialization.
Is CVE-2025-59245 being exploited?
There is no known exploitation of CVE-2025-59245 in the wild and no public exploit code.
Other vulnerabilities in Microsoft SharePoint Online
Sources
Also known as GHSA-rfxj-vg5q-9qc2.