Vulnerability report

Active exploitation observed Confirmed confidence In CISA KEV

CVE-2023-24955

Microsoft SharePoint Server Remote Code Execution Vulnerability

Microsoft / Microsoft SharePoint Enterprise Server 2016 · affected before 16.0.5395.1000

View live feed Monitor via API Watch CVE-2023-24955
Severity
CVSS 7.2 · High
Confidence
Confirmed
Exploit status
Observed in sensors
EPSS
85.4%
First observed
14 Aug 2026
Last observed
10 Sep 2026

Decision summary

What security teams need to know first

Direct answers before the deeper technical record.

What it is

CVE-2023-24955 is Microsoft SharePoint Server Remote Code Execution Vulnerability.

Is it exploited?

Yes. Previdian sensors observed exploitation attempts with confirmed confidence. Listed in CISA KEV.

Who is affected?

Microsoft / Microsoft SharePoint Enterprise Server 2016 affected before 16.0.5395.1000.

What should we do?

Patch immediately, validate internet-facing exposure, and monitor for matching requests.

Overview

Microsoft SharePoint Server Remote Code Execution Vulnerability

Microsoft SharePoint Server Remote Code Execution Vulnerability

Vendor Product Affected Status
Microsoft Microsoft SharePoint Enterprise Server 2016 Before 16.0.5395.1000 Affected
Microsoft Microsoft SharePoint Server 2019 Before 16.0.10398.20000 Affected
Microsoft Microsoft SharePoint Server Subscription Edition Before 16.0.16130.20420 Affected
View vendor advisory (opens in new tab)
Published
09 May 2023
Exploitation Reported
26 Mar 2024
Attack vector
Remote
Complexity
Low
Privileges
High
User interaction
None

Tags

malware cisa microsoft metasploit ransomware

CVE References

Exploitation evidence

Why Previdian marks this CVE as exploited

Third-party attestation and first-party sensor observation are shown separately so teams can judge the evidence chain.

Exploited in the wild

CISA

Recorded 26 Mar 2024

A trusted third party reported exploitation.

Active exploitation observed

Previdian sensor

First observed 26 Aug 2026

Previdian first observed exploitation attempts targeting this vulnerability in our honeypot sensors.

Used in malware

CISA

Recorded 26 Mar 2024

Malware families have been linked to exploitation of this CVE.

Proof of concept available

GitHub

Recorded 28 Dec 2023

Public scanner or PoC coverage increases practical exploitability.

Known exploited vulnerability sources

Per-source evidence links for KEV attestations are available through the Previdian Pro API.

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Source Added
CISA First 2024-03-26 00:00 UTC
Previdian 2026-08-26 12:00 UTC

Operational indicators for this CVE are listed under Detection.

Sensor telemetry

First-party evidence of exploitation activity

Previdian sensors recorded exploitation attempts targeting this vulnerability. The cards and chart show volume, unique attackers, and daily activity.

77

Attempts observed

19

Unique attacker IPs

9

Attacker countries

FR · HK · ID · NL · RO · RU · SA · SG · US

1

Sensors observed

CVE-2023-24955 exploitation attempts over the last 30 days

Daily events observed by Previdian sensors

Updated 11 Sep 2026

0
1
0
0
0
0
0
0
0
0
0
0
11
34
19
0
7
2
0
0
1
0
0
0
0
1
0
0
1
0
13 Aug 19 Aug 25 Aug 31 Aug 11 Sep

First observed 14 Aug 2026 · Last observed 10 Sep 2026

Pro adds sensor region and window summaries. Enterprise adds raw IPs, paths, User-Agents, and payloads.

Request telemetry access

Detection

Operational artifacts and observed signals

Make the evidence actionable in scanner, SOC, and edge-control workflows.

Observed signals

Request targets
User-Agents
Callback hosts
19
9
1

Request targets and User-Agents available in Pro. Callback host details available in Enterprise.

Virtual patch status

No Previdian virtual patch is currently available. Future rules ship for ModSecurity, Cloudflare, and AWS WAF.

Learn about virtual patches →

Attacker IP Indicators

Attacker IP indicators observed · available in Pro and Enterprise.

Sensor-derived attacker IP indicators are available to Pro and Enterprise accounts under Detection and through the Pro API.

Learn about Pro API access

Scanner Artifacts

Scanner and exploit-framework references linked to this CVE.

Scanner Reference Detected
Metasploit https://github.com/rapid7/metasploit-framework/blob/master/modules/exploits/windows/http/sharepoint_dynamic_proxy_generator_auth_bypass_rce.rb 28 Apr 2025

Risk and context

Severity, weaknesses, and research context

CVSS v3.1

7.2 High
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

EPSS

85.4%

Weaknesses

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

Potential Proof of Concepts

These PoCs are unverified and could contain malware. Use at your own risk.

sharepoint_dynamic_proxy_generator_auth_bypass_rce

metasploit · Created Unknown

Metasploit module for CVE-2023-24955

Timeline

From disclosure to observed exploitation

  1. Observed by Previdian sensors

    Evidence-backed exploitation signal

  2. Indicators of compromise added (19)

    Indicators of compromise recorded

  3. Metasploit module available

    Exploit module available

  4. Public PoC available

    Public proof-of-concept code published

  5. Added to CISA KEV

    Listed in the CISA Known Exploited Vulnerabilities catalog

  6. First public exploitation report

    Exploit observed in malware

  7. CVE published

    Vulnerability disclosed publicly

  8. CVE ID reserved

    Identifier reserved by the CNA

Pro API

Automate this intelligence

Confidence, exploit status, sensor telemetry, PoCs, scanner integrations, mentions, and tags are available programmatically for VM, SOC, and CTI workflows.

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  • Evidence confidence and provenance
  • First-party sensor telemetry
  • PoC and scanner references
  • Affected versions and enrichment
  • Automation-ready JSON delivery

GET /api/v2/pro/kevs/CVE-2023-24955

Free JSON includes basic KEV fields 
{
  "cve_id": "CVE-2023-24955",
  "confidence": "Confirmed",
  "cvss_score": 7.2,
  "cvss_estimated": false,
  "epss_score": 0.85395,
  "exploit_status": {
    "exploited_in_the_wild": true,
    "active_exploitation_observed": true
  },
  "sensor_telemetry": { "attempts": 77, "sensors": 1 }
}