CVE-2023-21742 — Microsoft SharePoint Server Remote Code Execution Vulnerability

Executive Summary

None

Overview

8.8

CVSS HIGH

Important

MS Severity

Not Exploited

MS Exploit Status

Less Likely

MS Exploit Likelihood

Category Remote Code Execution

Weakness CWE-284: Improper Access Control

Released Jan 10 2023

Last Updated Jan 10 2023

Publicly Disclosed No

CISA KEV Not Listed

Known Exploits None Known

EPSS Score 0.55786 — 0.98953 percentile

NVD CVSS 8.8 HIGH — matches MSRC

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C

ATTACK VECTOR

Network

ATTACK COMPLEXITY

Low

PRIVILEGES REQUIRED

Low

USER INTERACTION

None

SCOPE

Unchanged

CONFIDENTIALITY

High

INTEGRITY

High

AVAILABILITY

High

EXPLOIT CODE MATURITY

Unproven

REMEDIATION LEVEL

Official Fix

REPORT CONFIDENCE

Confirmed

Temporal Score: 7.7

EPSS Score

0.55786

probability of exploitation in the next 30 days

0.98953 percentile - updated 2026-08-14

View on FIRST.org

Affected Products

4 affected products

Product	KB Article	Severity	Impact	Restart Required
Microsoft SharePoint Enterprise Server 2013 Service Pack 1 5002335 (Cumulative Update) 5002336 (Security Update) Important Remote Code Execution 5002319 Base: 8.8 Temporal: 7.7 Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C 15.0.5519.1000 Maybe 5002336 Microsoft SharePoint Enterprise Server 2016	`5002338 (Security Update)`	Important	Remote Code Execution	Maybe
Microsoft SharePoint Foundation 2013 Service Pack 1	`5002336 (Security Update)`	Important	Remote Code Execution	Maybe
Microsoft SharePoint Server 2019	`5002329 (Security Update)`	Important	Remote Code Execution	Maybe
Microsoft SharePoint Server Subscription Edition	`5002331 (Security Update)`	Important	Remote Code Execution	Maybe

Patches

4 patches

Article	Type	Restart
`5002338`	Security Update	Maybe
`5002336`	Security Update	Maybe
`5002329`	Security Update	Maybe
`5002331`	Security Update	Maybe

Exploits & PoC

1 public PoC

Unverified third-party code

Public proof-of-concept repositories aggregated from PoC-in-GitHub. They are not reviewed and may be incomplete, non-functional, or malicious — inspect the code before running anything.

Repository	Stars	Published	Description
ohnonoyesyes/CVE-2023-21742	14	2023-04-07	CVE-2023-21742 Poc

Detection Rules

No public Sigma or Nuclei detection rule has been mapped to this CVE yet. Coverage is concentrated on exploited / high-profile vulnerabilities; check SigmaHQ for updates.

Acknowledgments

Anonymous

References

MSRC Advisory MITRE NVD