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Limited ExploitationCVE-2023-29357Public Exploit

Microsoft SharePoint Server 2019 - Privilege Escalation (CVE-2023-29357)

PublishedJun 13, 2023
First SeenN/A
Last Seen
Reported
CVSS9.8
Microsoft
MicrosoftMicrosoft SharePoint Server 2019
enterprise_software

Description

Microsoft SharePoint Server Elevation of Privilege Vulnerability

psychologyCrowdSec Analysis

CVE-2023-29357 is a critical privilege escalation vulnerability in Microsoft SharePoint Server 2019. This flaw could allow remote, unauthenticated attackers to gain elevated privileges on the affected SharePoint server, potentially leading to full system compromise and unauthorized access to sensitive data.

CrowdSec has been tracking this vulnerability and its exploits since 8th of April 2026.

CrowdSec has not observed any significant exploitation activity targeting CVE-2023-29357 across its network. As a result, no community-driven trend analysis is available for this vulnerability at this time.

Attackers exploit this vulnerability by sending forged JWT tokens with the "none" algorithm in the Authorization header to SharePoint API endpoints such as /_api/web/siteusers, bypassing authentication and gaining unauthorized access to sensitive SharePoint data.

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EventDate
CVE Published2023-06-13
CISA KEV2024-01-10
CISA Remediation Deadline2024-01-31
Rule Released2026-04-08

Related Weaknesses

CWE-303: Incorrect Implementation of Authentication Algorithm

The requirements for the product dictate the use of an established authentication algorithm, but the implementation of the algorithm is incorrect.

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External References