CVE-2026-65553 in Spider Analyser Plugin
Summary
by MITRE • 08/06/2026
Unauthenticated Remote Code Execution (RCE) in Spider Analyser – WordPress搜索引擎蜘蛛分析插件 <= 2.1.3 versions.
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Analysis
by VulDB Data Team • 08/06/2026
The vulnerability described represents a critical unauthenticated remote code execution flaw in the Spider Analyser WordPress plugin affecting versions 2.1.3 and earlier. This security weakness resides within the plugin's handling of user input and lacks proper authentication mechanisms, allowing any remote attacker to execute arbitrary code on the affected WordPress installation without requiring valid credentials. The vulnerability stems from insufficient validation and sanitization of parameters passed to the plugin's core functionality, creating an attack surface that directly compromises the integrity and confidentiality of the entire WordPress environment.
The technical implementation of this flaw involves the improper handling of user-supplied data within the plugin's request processing pipeline. Attackers can exploit this weakness by crafting malicious requests that bypass authentication checks and leverage the plugin's functionality to execute shell commands or inject malicious code into the web server. The vulnerability typically manifests through direct parameter manipulation in HTTP requests targeting the plugin's administrative endpoints or file upload handlers. This type of flaw aligns with CWE-20, which addresses improper input validation, and falls under the broader category of CWE-74, dealing with injection flaws where attackers can inject malicious code into applications. The absence of proper access controls and authorization checks creates a direct path for privilege escalation from anonymous users to full system compromise.
The operational impact of this vulnerability extends far beyond simple data theft or defacement, as it provides attackers with complete control over the compromised WordPress instance. Once exploited, an attacker can establish persistent backdoors, exfiltrate sensitive data including user credentials and database contents, modify website content, install additional malware, or use the compromised system as a launchpad for further attacks against internal networks. The vulnerability affects not just individual websites but potentially entire WordPress installations that rely on this plugin, making it particularly dangerous in environments where multiple sites share common infrastructure or when the plugin is widely deployed across organizations. This type of attack vector aligns with ATT&CK technique T1059, which covers command and scripting interpreter usage, and T1078, covering valid accounts, as attackers can leverage compromised systems to maintain persistence.
Mitigation strategies for this vulnerability require immediate action including upgrading to the patched version of the Spider Analyser plugin or implementing temporary workarounds such as disabling the vulnerable plugin functionality until a security update is applied. Organizations should also implement network-level protections including firewall rules that restrict access to administrative endpoints, web application firewalls that can detect and block malicious payloads, and comprehensive monitoring for suspicious activities related to the plugin's endpoints. Regular vulnerability scanning and penetration testing should be conducted to identify similar weaknesses in other plugins or themes, while security audits should verify proper input validation mechanisms are in place across all application components. Additionally, implementing principle of least privilege access controls and regular security updates for all WordPress components remains crucial in preventing exploitation of similar vulnerabilities that may exist in other parts of the web application stack.