CVE-2025-53728 Overview
CVE-2025-53728 is an information disclosure vulnerability in Microsoft Dynamics 365 (on-premises). An unauthorized attacker can disclose sensitive information over a network when a targeted user interacts with a crafted resource. The flaw is tracked under CWE-200: Exposure of Sensitive Information to an Unauthorized Actor.
The vulnerability was published to the National Vulnerability Database (NVD) on August 12, 2025. Microsoft published a corresponding advisory in its Security Update Guide.
Critical Impact
Exploitation exposes confidential data stored or processed by Microsoft Dynamics 365 on-premises deployments, undermining data confidentiality in customer relationship management (CRM) workloads.
Affected Products
- Microsoft Dynamics 365 (on-premises)
- Deployments matching CPE cpe:2.3:a:microsoft:dynamics_365:*:*:*:*:on-premises:*:*:*
- Cloud-hosted Dynamics 365 tenants are not identified as affected in the vendor advisory
Discovery Timeline
- 2025-08-12 - CVE-2025-53728 published to NVD
- 2026-06-17 - Last updated in NVD database
Technical Details for CVE-2025-53728
Vulnerability Analysis
CVE-2025-53728 is an Information Disclosure vulnerability in Microsoft Dynamics 365 (on-premises). The weakness maps to CWE-200, where an application exposes sensitive information to actors that are not explicitly authorized to access it.
The attack occurs over the network and requires user interaction. An attacker cannot trigger the flaw without a targeted user performing an action, such as opening a crafted link or resource. No prior authentication is required to launch the attack.
Successful exploitation impacts confidentiality only. Integrity and availability of the Dynamics 365 environment are not affected according to the vendor's assessment. The Exploit Prediction Scoring System (EPSS) reports a probability of 1.18% with a percentile of 64.08 as of July 13, 2026.
Root Cause
Microsoft has not publicly disclosed the exact code path. Based on the CWE-200 classification, the root cause is improper restriction of access to sensitive data returned by Dynamics 365 components. Data intended for authorized users is reachable through an interaction-triggered flow that lacks sufficient access checks.
Attack Vector
The attack vector is network-based. An unauthenticated attacker crafts content or a request that, once the victim interacts with it, causes Dynamics 365 to return sensitive information to the attacker. Because user interaction is required, phishing and social engineering are the most likely delivery mechanisms.
No public proof-of-concept exploit or exploit database entry is currently available for CVE-2025-53728. The vulnerability is not listed in the CISA Known Exploited Vulnerabilities catalog.
See the Microsoft CVE-2025-53728 Update for vendor-provided technical details.
Detection Methods for CVE-2025-53728
Indicators of Compromise
- Unexpected outbound requests from Dynamics 365 front-end servers correlated with user click-through events on external links.
- Anomalous HTTP responses from Dynamics 365 endpoints returning larger-than-typical payloads to unauthenticated sessions.
- Phishing emails referencing Dynamics 365 URLs, forms, or CRM record identifiers targeting internal users.
Detection Strategies
- Inspect Dynamics 365 IIS logs for anonymous or low-privilege sessions requesting resources that normally require authentication.
- Correlate email gateway telemetry with web proxy logs to identify users interacting with suspicious Dynamics 365 links.
- Baseline normal Dynamics 365 API response sizes and flag statistical outliers that may indicate data exfiltration.
Monitoring Recommendations
- Enable verbose auditing on Dynamics 365 on-premises servers, including request URIs, referrers, and authenticated user context.
- Forward web server and application logs to a centralized SIEM for retention and correlation with identity telemetry.
- Monitor Active Directory and Dynamics 365 role assignments for unexpected changes that could amplify data exposure.
How to Mitigate CVE-2025-53728
Immediate Actions Required
- Apply the Microsoft security update referenced in the Microsoft CVE-2025-53728 Update advisory to all Dynamics 365 on-premises servers.
- Inventory all on-premises Dynamics 365 deployments and confirm patch level against the vendor's fixed build.
- Educate users on phishing risks and validate email filtering rules that block spoofed Dynamics 365 messages.
Patch Information
Microsoft has released a security update for Microsoft Dynamics 365 (on-premises) addressing CVE-2025-53728. Administrators should consult the Microsoft Security Response Center advisory for the exact update package applicable to their deployed version and apply it through standard change management processes.
Workarounds
- Restrict network access to Dynamics 365 on-premises interfaces to trusted corporate networks or VPN ranges until patching is complete.
- Enforce multi-factor authentication (MFA) on all accounts that can access Dynamics 365 to reduce downstream impact from disclosed information.
- Increase user awareness training to reduce the likelihood of interaction-based exploitation delivered through phishing.
# Verify installed Dynamics 365 on-premises version on Windows Server
Get-ItemProperty "HKLM:\SOFTWARE\Microsoft\MSCRM" | Select-Object CRM_Server_Version, InstalledOn
# List installed updates for correlation with the Microsoft advisory
Get-HotFix | Sort-Object -Property InstalledOn -Descending | Select-Object -First 20
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
