Microsoft SharePoint Server Privilege Escalation Vulnerability (CVE-2023-29357)
Severity: critical · Patch status: patched · Since 2024-01-10 · CVE-2023-29357
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. CISA added CVE-2023-29357 to its Known Exploited Vulnerabilities catalog on Jan 10, 2024, which means attackers are exploiting it in the wild. CISA reports known use in ransomware campaigns.
What to do
- Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
- US federal agencies must remediate by Jan 31, 2024 (BOD 22-01); treat that as the outer limit.
Sources
All live incidents on Threat Watch
