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

CVE-2023-29357 · Severity: critical · CVSS 9.8 · Exploited in the wild · Published 2024-01-10

Microsoft SharePoint Server contains a vulnerability in the authentication process that allows an unauthenticated attacker to bypass security measures using spoofed JWT tokens. By exploiting this flaw, an attacker can gain administrative privileges and execute network-based attacks without user interaction.

Technologies: Microsoft SharePoint Server. Vendors: Microsoft.

Quick answers

Is CVE-2023-29357 exploited in the wild?
Yes. CVE-2023-29357 is known to be exploited in the wild, first recorded on 10 January 2024. Treat it as urgent.
How severe is CVE-2023-29357?
Critical severity, with a CVSS score of 9.8, published 10 January 2024.
Which products and versions are affected?
Microsoft SharePoint Server 2019.
Is there a fix for CVE-2023-29357?
No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
How is CVE-2023-29357 attacked?
It is attacked over the network, in a network appliance.
Am I affected by CVE-2023-29357?
Check whether you run Microsoft SharePoint Server. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Affected products

  • Microsoft SharePoint Server 2019

Timeline

  • 2023-06-13: disclosed: NVD Published Date
  • 2024-01-10: kev added: Added to CISA Known Exploited Vulnerabilities Catalog
  • 2024-01-31: other: CISA KEV remediation due date

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