CVE-2025-30391: Microsoft Dynamics Input Validation Vulnerability Leading to Unauthorized Information Disclosure

Overview

In the realm of cybersecurity, every potential point of unauthorized access or data leakage is a matter of grave concern. This blog post focuses on one such vulnerability, CVE-2025-30391, found within the popular business application software, Microsoft Dynamics. This critical flaw, due to improper input validation, could allow an unauthorized attacker to disclose sensitive information over a network. Companies relying on Microsoft Dynamics need to be aware of this vulnerability and the potential for system compromise or data leakage.

Vulnerability Summary

CVE ID: CVE-2025-30391
Severity: High, CVSS score of 8.1
Attack Vector: Network
Privileges Required: None
User Interaction: None
Impact: Unauthorized information disclosure, potential system compromise or data leakage

Affected Products

Product | Affected Versions

Microsoft Dynamics | All versions up to and including the latest version at the time of discovery

How the Exploit Works

The vulnerability stems from a flaw in the input validation process of Microsoft Dynamics. An attacker can craft a malicious payload that is embedded in a seemingly benign request. This payload, when processed by the vulnerable software, triggers the vulnerability, allowing the attacker to gain unauthorized access to sensitive information over the network. Without the need for any user interaction or privilege escalation, this exploit can lead to a potentially devastating system compromise or data leakage.

Conceptual Example Code

Here is a conceptual example of how the vulnerability might be exploited. This is a hypothetical HTTP request containing a malicious payload:

POST /dynamics/api/endpoint HTTP/1.1
Host: target.example.com
Content-Type: application/json
{ "malicious_payload": "<script>...</script>" }

In this example, the attacker has embedded a malicious script within the payload of the request. Once the request is processed by the vulnerable endpoint, the malicious script can be executed, leading to unauthorized information disclosure.

Mitigation Guidance

Until a patch is issued by the vendor, the mitigation strategy against this vulnerability includes using a Web Application Firewall (WAF) or an Intrusion Detection System (IDS) to monitor incoming network traffic and detect any malicious payloads. Furthermore, it is recommended to regularly monitor and update the software to ensure its security.
In conclusion, CVE-2025-30391 is a severe vulnerability within Microsoft Dynamics that could potentially lead to unauthorized information disclosure and system compromise. Organizations using this software should take immediate steps to mitigate this vulnerability until a patch is available.