January 10, 2024 · Applied Cybernetics Group
CVE-2023-29357 — Microsoft SharePoint Server
known ransomware use
Microsoft SharePoint Server Privilege Escalation Vulnerability
- Added to KEV
2024-01-10- Federal due date
2024-01-31- Vendor
- Microsoft
- Product
- SharePoint Server
- EPSS
- 100.0th percentile (score 0.944, as of
2026-06-08) - NVD CVSS v3.1
- —
- Ransomware use
- Known
- Upstream
- https://nvd.nist.gov/vuln/detail/CVE-2023-29357
CISA short description
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.
Required action
Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.