CVE-2026-20189 in Prime Infrastructure
Summary
by MITRE • 05/06/2026
A vulnerability in the log file download functionality of Cisco Prime Infrastructure could allow an authenticated, remote attacker to download arbitrary log files from the server.
This vulnerability is due to insufficient authorization checks on the download service API. An attacker could exploit this vulnerability by submitting a crafted URL request to an affected device. A successful exploit could allow the attacker to download sensitive log files that they would otherwise not have authorization to access. To exploit this vulnerability, the attacker must have valid credentials to access the web-based management interface of the affected device.
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Analysis
by VulDB Data Team • 06/29/2026
This vulnerability resides within Cisco Prime Infrastructure's log file download functionality, representing a critical authorization flaw that undermines the system's security posture. The vulnerability stems from inadequate validation of user permissions within the download service API, creating a path for authenticated attackers to bypass intended access controls. The flaw allows malicious actors to manipulate API requests and gain access to log files that should remain restricted to authorized personnel only. This represents a significant escalation of privileges within the system's security model, as the attacker can leverage their legitimate credentials to access data beyond their intended scope.
The technical exploitation mechanism relies on crafting specially formatted URL requests that circumvent the authorization checks implemented by the system. This type of vulnerability falls under the CWE-285 category, specifically addressing insufficient authorization controls within web applications. The attacker must first establish a valid session through the web-based management interface, which provides the initial foothold for the attack. Once authenticated, the malicious actor can manipulate the download service API endpoints to request log files that would normally require elevated privileges or specific roles to access. The vulnerability essentially creates a backdoor within the legitimate authentication flow, allowing unauthorized data access through API manipulation rather than direct system compromise.
The operational impact of this vulnerability extends beyond simple data exposure, as log files often contain sensitive information including system configurations, user activities, network traffic patterns, and potentially confidential operational data. An attacker who successfully exploits this vulnerability could gain access to comprehensive audit trails, system error logs, and other diagnostic information that could be used for further attacks or to understand the target environment's operational structure. This information could be particularly valuable for planning more sophisticated attacks or for conducting reconnaissance activities against other systems within the network. The vulnerability essentially undermines the integrity of the system's logging infrastructure and the trust placed in the access control mechanisms.
Organizations affected by this vulnerability should implement immediate mitigations including strengthening the authorization checks within the download service API, implementing proper input validation for all API endpoints, and conducting thorough access control reviews. The recommended approach involves enforcing strict role-based access controls that validate user permissions at the API level for each file access request. Additionally, implementing comprehensive logging of all download activities can help detect unauthorized access attempts. This vulnerability aligns with ATT&CK technique T1078.004, which covers valid accounts with restricted access, and represents a classic case of privilege escalation through API manipulation. The mitigation strategy should include regular security assessments of web application interfaces and implementation of automated tools to detect and prevent unauthorized API access attempts.