CVE-2026-64873 in Cache Cleaner Pro Plugin
Summary
by MITRE • 07/23/2026
Custom query URLs could access internal or reserved network services.
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Analysis
by VulDB Data Team • 07/23/2026
This vulnerability represents a critical access control flaw that allows unauthorized entities to bypass normal network security boundaries through crafted custom query URLs. The technical implementation involves improper validation of URL parameters that enables attackers to construct malicious requests capable of reaching internal network services that should remain isolated from external access. Such vulnerabilities typically arise from inadequate input sanitization and insufficient network segmentation controls within web applications or API endpoints.
The operational impact of this vulnerability extends beyond simple information disclosure to encompass potential system compromise and lateral movement within network infrastructures. Attackers can exploit these pathways to access sensitive internal resources including database servers, administrative interfaces, or other privileged services that normally operate behind firewalls or access control lists. This represents a classic case of insufficient authorization checks where URL parsing logic fails to properly validate the destination endpoints of user-supplied query parameters.
From a cybersecurity framework perspective, this vulnerability aligns with CWE-20: Improper Input Validation and CWE-668: Exposure of Resource to Wrong Sphere, demonstrating how improper handling of user-controllable input can lead to unauthorized resource access. The vulnerability also maps to ATT&CK technique T1071.004: Application Layer Protocol: DNS where attackers might use malformed queries to probe internal services, or T1046: Network Service Scanning when enumerating accessible internal endpoints through crafted URL requests.
The exploitation typically requires minimal technical skill and can be automated through various reconnaissance tools that systematically test for such misconfigurations. Organizations commonly encounter this issue in web applications that dynamically construct service endpoints based on user input without proper validation or access control enforcement. The vulnerability often manifests in RESTful APIs, content management systems, or any application that accepts dynamic URL parameters to determine backend service destinations.
Mitigation strategies should focus on implementing robust input validation controls that sanitize all URL parameters and enforce strict destination endpoint validation. Network segmentation through firewalls and access control lists can prevent unauthorized access to internal services even if the application layer fails. Additionally, implementing proper authorization checks at multiple layers including API gateways, web application firewalls, and backend service access controls provides defense-in-depth protection against such attacks. Regular security testing including penetration testing and automated vulnerability scanning should specifically target URL parameter handling to identify and remediate similar weaknesses before exploitation occurs.