CVE-2024-30043Public exploitNetwork attack vector

Authenticated file disclosure via XML resolver confusion

Published May 14, 2024 · Updated May 3, 2025

XXE in Microsoft SharePoint Server 2016, 2019, and Subscription Edition allows remote authenticated users to read service-account files. BaseXmlDataSource gives an attacker-controlled DataFile URL to SPXmlDataSource and XmlSecureResolver; inconsistent parsing of a malformed file URL grants unrestricted resolution before DTD blocking occurs. A low-privileged user who can upload XML and add a data source to a SharePoint page can read local files as the farm service account or issue server-side requests.

CVSS severity6.5
Medium
EPSS probability54.66%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

XXE in Microsoft SharePoint Server 2016, 2019, and Subscription Edition allows remote authenticated users to read service-account files. BaseXmlDataSource gives an attacker-controlled DataFile URL to SPXmlDataSource and XmlSecureResolver; inconsistent parsing of a malformed file URL grants unrestricted resolution before DTD blocking occurs. A low-privileged user who can upload XML and add a data source to a SharePoint page can read local files as the farm service account or issue server-side requests.

The record

CVE
CVE-2024-30043
Published
May 14, 2024
Updated
May 3, 2025
Vendor
Microsoft
Product
Microsoft SharePoint Enterprise Server 2016
Classifications
CWE-611, T1005
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. May 14, 2024CVE publishedPublication date reported by the CVE source.
  2. May 3, 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 <16.0.5448.1000

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Microsoft · Microsoft SharePoint Enterprise Server 2016version=16.0.0 <16.0.5448.1000
Microsoft · Microsoft SharePoint Server 2019version=16.0.0 <16.0.10409.20047
Microsoft · Microsoft SharePoint Server Subscription Editionversion=16.0.0 <16.0.17328.20292

Published CVSS scores

6.5Microsoft CorporationCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

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 exploitPublished

Weakness, pattern, technique

CWE-611Improper Restriction of XML External Entity Reference
T1005Data from Local System

Public exploit references

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

Technologies

Your stack

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Your stack

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