Vulnerability · Published Aug 11, 2026 · Assigned by microsoft
CVE-2026-63516Microsoft SharePoint Server Spoofing Vulnerability
Medium 6.5
In plain English
A medium-severity unsafe deserialization in Microsoft SharePoint Enterprise Server 2016 from Microsoft. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 1.9% (higher than 79% of all known vulnerabilities).
Severity (CVSS 3.1)6.5Medium
Exploit odds (30 days)1.9%top 20.5% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
Deserialization of untrusted data in Microsoft Office SharePoint allows an authorized attacker to perform spoofing over a network.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Microsoft | Microsoft SharePoint Enterprise Server 2016 | 16.0.0 – before 16.0.5565.1001 |
| Microsoft | Microsoft SharePoint Server 2019 | 16.0.0 – before 16.0.10417.20198 |
| Microsoft | Microsoft SharePoint Server Subscription Edition | 16.0.0 – before 16.0.19725.20522 |
Weakness: CWE-502 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C
References
- Microsoft SharePoint Server Spoofing Vulnerability vendor-advisory, patch