Vulnerability · Published Aug 11, 2026 · Assigned by microsoft
CVE-2026-66805Microsoft SharePoint Server Remote Code Execution Vulnerability
High 8.8
In plain English
A high-severity unsafe deserialization in Microsoft SharePoint Server Subscription Edition from Microsoft. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 2.0% (higher than 81% of all known vulnerabilities).
Severity (CVSS 3.1)8.8High
Exploit odds (30 days)2.0%top 18.7% 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 execute code over a network.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Microsoft | Microsoft SharePoint Server Subscription Edition | 16.0.0 – before 16.0.20326.20190 |
Weakness: CWE-502 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
References
- Microsoft SharePoint Server Remote Code Execution Vulnerability vendor-advisory, patch