CVE-2023-29357: Microsoft SharePoint Server Privilege Escalation Vulnerability

CISA Known Exploited Vulnerability (KEV)

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 (CISA)

Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.

Notes

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-29357; https://nvd.nist.gov/vuln/detail/CVE-2023-29357

Weakness behind it

CISA records this vulnerability as an instance of CWE-303. From there the chain continues into CAPEC attack patterns and ATT&CK techniques, all inside this corpus.

References

• NVD: https://nvd.nist.gov/vuln/detail/CVE-2023-29357
• KEV catalog: https://www.cisa.gov/known-exploited-vulnerabilities-catalog