CVE-2023-33157Network attack vector

Authenticated remote code execution

Published Jul 11, 2023 · Updated Feb 28, 2025

Code injection in affected Microsoft SharePoint Server 16.0 builds allows remote authenticated users to execute arbitrary code over a network. Microsoft has not published the vulnerable component, request path, or operation that converts attacker-controlled input into executable code. Valid SharePoint credentials are required, and successful exploitation can compromise the server's data and availability.

CVSS severity8.8
High
EPSS probability38.16%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Code injection in affected Microsoft SharePoint Server 16.0 builds allows remote authenticated users to execute arbitrary code over a network. Microsoft has not published the vulnerable component, request path, or operation that converts attacker-controlled input into executable code. Valid SharePoint credentials are required, and successful exploitation can compromise the server's data and availability.

The record

CVE
CVE-2023-33157
Published
Jul 11, 2023
Updated
Feb 28, 2025
Vendor
Microsoft
Product
Microsoft SharePoint Enterprise Server 2016
Classifications
CWE-94
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 11, 2023CVE publishedPublication date reported by the CVE source.
  2. Feb 28, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=16.0.0 <16.0.5404.1000

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Microsoft · Microsoft SharePoint Enterprise Server 2016version=16.0.0 <16.0.5404.1000
Microsoft · Microsoft SharePoint Server 2019version=16.0.0 <16.0.10400.20008
Microsoft · Microsoft SharePoint Server Subscription Editionversion=16.0.0 <16.0.16130.20642

Published CVSS scores

8.8Microsoft CorporationCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-94Improper Control of Generation of Code ('Code Injection')

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo