CVE-2026-2500 in Quick Playground Plugin
Summary
by MITRE • 06/06/2026
The Quick Playground plugin for WordPress is vulnerable to Path Traversal in all versions up to, and including, 1.3.4. This is due to the `qckply_data()` function passing the user-supplied `filename` POST parameter directly to `file_get_contents()` without any validation, sanitization, or path restriction. This makes it possible for authenticated attackers, with Administrator-level access and above, to read arbitrary files on the server, such as `wp-config.php` or `/etc/passwd`, which can contain sensitive information. Note: This vulnerability is only exploitable when the site has been synced with WordPress Playground (the `is_qckply_clone` option is set) or when running on `playground.wordpress.net`.
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Analysis
by VulDB Data Team • 06/07/2026
The Quick Playground plugin for WordPress presents a critical path traversal vulnerability that affects all versions up to and including 1.3.4, representing a significant security risk for WordPress installations. This vulnerability stems from improper input validation within the qckply_data() function which directly passes user-supplied filename POST parameters to the file_get_contents() function without any sanitization or path restriction mechanisms. The flaw creates an environment where authenticated attackers with administrator-level privileges or higher can exploit this weakness to access arbitrary files on the compromised server. The vulnerability is particularly concerning because it allows attackers to read sensitive system files such as wp-config.php which contains database credentials and cryptographic keys, or even system files like /etc/passwd that reveal user account information. This type of vulnerability falls under the CWE-22 category of Path Traversal, which is classified as a serious weakness that enables unauthorized access to files outside of the intended directory structure.
The operational impact of this vulnerability extends beyond simple information disclosure, as it provides attackers with critical system information that can be leveraged for further attacks. When an attacker successfully exploits this vulnerability, they gain access to configuration files that often contain database passwords, API keys, and other sensitive credentials that can be used to escalate privileges or move laterally within the network. The attack vector requires authentication with administrator-level privileges, which makes the vulnerability somewhat less likely to be exploited by casual attackers but still poses a significant risk in environments where administrative credentials may be compromised or when insider threats exist. The vulnerability is specifically tied to WordPress Playground functionality, meaning it only becomes exploitable when the site has been synchronized with WordPress Playground (indicated by the is_qckply_clone option being set) or when the site is running on the playground.wordpress.net domain, which creates a more controlled environment for exploitation.
The security implications of this vulnerability align with several ATT&CK techniques including T1005 (Data from Local System) and T1566 (Phishing with Social Engineering), as attackers can use the information gained from reading system files to craft more sophisticated attacks or to gain additional access to the system. Organizations should consider implementing additional security controls such as web application firewalls that can detect and block suspicious file access patterns, as well as regular security audits that check for proper input validation in all user-supplied parameters. The vulnerability demonstrates the importance of the principle of least privilege, where even administrators should not be able to access arbitrary files on the system through plugin functions. Mitigation strategies should include immediate patching to versions that address this vulnerability, implementing proper input validation and sanitization for all user-supplied data, and monitoring for unusual file access patterns that could indicate exploitation attempts. Additionally, security teams should ensure that the is_qckply_clone option is properly controlled and monitored, as this setting determines whether the vulnerable functionality is active on the system.