Vulnerability in Microsoft Sharepoint Server 2019

CVE-2023-29357

Microsoft SharePoint Server Elevation of Privilege Vulnerability

Published · last modified .

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 1.000 (100.0th percentile), scored .

Very high probability of exploitation in the next 30 days — among the top 0.1% most-likely-to-be-exploited CVEs. 100th percentile — 100.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

The 30-day trend appears once there are two daily scores.

Affected products

Weakness classification (CWE)

CISA KEV (Known Exploited Vulnerabilities)

This CVE is on the CISA KEV catalog, added on . CISA KEV inclusion means CISA has confirmed in-the-wild exploitation; US federal agencies are required to remediate within a published due date.

BOD 22-01 due date: .

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

Known ransomware campaign use: yes.

Public proof-of-concept exploits

References

Frequently asked questions

What is CVE-2023-29357?
CVE-2023-29357 is a critical-severity vulnerability in Microsoft Sharepoint Server 2019, classified under Incorrect Implementation of Authentication Algorithm. CVSS score: 9.8/10. Published 2023-06-14.
How severe is CVE-2023-29357?
Critical severity. CVSS v3 base score is 9.8 out of 10.
Is CVE-2023-29357 known to be exploited?
Yes. CVE-2023-29357 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2024-01-10), indicating it is being actively exploited. 34 public proof-of-concept repositories are indexed.