SB2026071736 - Deserialization of Untrusted Data in Microsoft SharePoint Server
Published: July 17, 2026
Security Bulletin ID
SB2026071736
CSH Severity
High
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Remote access
Highest impact
Code execution
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Deserialization of Untrusted Data (CVE-ID: CVE-2026-58644)
CWE-ID: CWE-502 - Deserialization of Untrusted Data
CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:A/U:Amber
The vulnerability allows a remote attacker to execute arbitrary code.
The vulnerability exists due to deserialization of untrusted data in Microsoft Office SharePoint when processing network requests. A remote attacker can send crafted serialized data to execute arbitrary code.
Exploitation has been detected in the wild.
Remediation
Install update from vendor's website.