Microsoft · SharePoint Server
CVE-2023-29357
Microsoft SharePoint Server Elevation of Privilege Vulnerability
What it is
Microsoft SharePoint Server Elevation of Privilege Vulnerability
CISA: Microsoft SharePoint Server contains an unspecified vulnerability that allows an unauthenticated attacker, who has gained access to spoofed JWT authentication tokens, to use them for executing a network attack. This attack bypasses authentication, enabling the attacker to gain administrator privileges.
What to do
Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
Deadline for US federal agencies: January 31, 2024
More exploited flaws from Microsoft
| Added | Vulnerability | Product | Severity | Attack chance |
|---|---|---|---|---|
| Jul 14, 2026 | Missing Authentication for Critical Function | SharePoint Server | Medium 5.3 | 1.0% |
| Jul 1, 2026 | Deserialization of Untrusted Data | SharePoint Server | High 8.8 | 80% |
| Apr 14, 2026 | Improper Input Validation | SharePoint Server | Medium 6.5 | 43% |
| Mar 26, 2024 | Code Injection | SharePoint Server | High 7.2 | 85% |
| Oct 13, 2026 | Command Injection | Windows | High 8.8 | 9.8% |
| Sep 25, 2026 | Code Injection | SharePoint | High 8.8 | 8.2% |
| Sep 8, 2026 | Link Following | Windows | High 7.8 | 0.4% |
| Sep 8, 2026 | Heap-Based Buffer Overflow | Windows | High 7.8 | 0.4% |
Sources: Known Exploited Vulnerabilities (CISA, public domain), CVE records (cve.org) and EPSS (FIRST). The chance of attacks is the EPSS estimate that someone will try to exploit the flaw in the next 30 days.