Improper access control in Azure Notification Service allows an authorized attacker to elevate privileges over a network
Description
Improper access control in Azure Notification Service allows an authorized attacker to elevate privileges over a network
AI Analyst Comment
Remediation
Apply vendor security updates immediately. Monitor for exploitation attempts and review access logs.
Executive Summary:
A high-severity vulnerability has been identified in multiple products from the vendor 'Improper' related to their use of the Azure Notification Service. This flaw, tracked as CVE-2025-59500, allows an attacker who already has some level of authorized access to the network to gain elevated privileges, potentially leading to unauthorized system control and data compromise.
Vulnerability Details
CVE-ID: CVE-2025-59500
Affected Software: Improper Multiple Products
Affected Versions: See vendor advisory for specific affected versions
Vulnerability: The vulnerability exists due to an improper access control mechanism within the integration of the Azure Notification Service. An authenticated attacker with low-level privileges can send a specially crafted request to the service endpoint. This request bypasses standard authorization checks, resulting in the attacker being granted higher-level permissions on the affected systems, effectively escalating their privileges.
Business Impact
This vulnerability is rated as High severity with a CVSS score of 7.7. Successful exploitation could have a significant business impact, allowing an attacker to move from a position of limited access to one with extensive control over critical systems. Potential consequences include unauthorized access to and exfiltration of sensitive data (e.g., customer information, intellectual property), modification or deletion of critical business data, deployment of ransomware, and complete system compromise, leading to operational downtime, financial loss, and reputational damage.
Remediation Plan
Immediate Action: The primary remediation is to apply the security updates provided by the vendor immediately across all affected assets. Prioritize patching for internet-facing and business-critical systems. After patching, review system and application access logs for any signs of unauthorized privilege escalation or suspicious activity preceding the patch deployment.
Proactive Monitoring: Implement enhanced monitoring focused on detecting potential exploitation attempts. This includes scrutinizing Azure activity logs for unusual API calls to the Notification Service, monitoring application logs for successful or failed privilege escalation events, and analyzing network traffic for anomalous patterns originating from low-privilege user segments. Configure alerts for the creation of new administrative accounts or unexpected changes to user permissions.
Compensating Controls: If immediate patching is not feasible, implement compensating controls to reduce the risk. Enforce the principle of least privilege to ensure user accounts only have the absolute minimum permissions required. Implement network segmentation to isolate affected systems and limit an attacker's ability to move laterally. Strengthen access controls on the affected services to restrict access to only essential personnel and trusted IP addresses.
Exploitation Status
Public Exploit Available: false
Analyst Notes: As of October 24, 2025, there are no known public proof-of-concept exploits or active attacks exploiting this vulnerability in the wild. The vulnerability is not currently listed on the CISA Known Exploited Vulnerabilities (KEV) catalog. However, due to the nature of privilege escalation flaws, threat actors may develop exploits to use in post-compromise scenarios.
Analyst Recommendation
Given the High severity rating (CVSS 7.7) and the risk of privilege escalation, this vulnerability poses a significant threat to the organization. We strongly recommend that the vendor-supplied security updates be treated as a high priority and applied to all affected systems as soon as possible. While there is no current evidence of active exploitation, vulnerabilities of this type are attractive targets for attackers seeking to deepen their foothold within a compromised network. Proactive patching is the most effective defense.