CVE-2025-10000 in Qyrr Plugin
Summary
by MITRE • 09/30/2025
The Qyrr – simply and modern QR-Code creation plugin for WordPress is vulnerable to arbitrary file uploads due to missing file type validation in the blob_to_file() function in all versions up to, and including, 2.0.7. This makes it possible for authenticated attackers, with Contributor-level access and above, to upload arbitrary files on the affected site's server which may make remote code execution possible.
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Analysis
by VulDB Data Team • 09/30/2025
The Qyrr WordPress plugin presents a critical security vulnerability through its blob_to_file() function implementation that fails to validate file types during upload operations. This flaw exists across all versions up to and including 2.0.7, creating an exploitable path for authenticated attackers who possess Contributor-level permissions or higher. The vulnerability stems from insufficient input validation mechanisms that allow malicious file uploads without proper content verification, fundamentally compromising the plugin's security posture and the broader WordPress installation it resides within.
This arbitrary file upload vulnerability operates through the core flaw in the blob_to_file() function which processes file uploads without implementing proper MIME type checking or file extension validation. The absence of these critical security controls enables attackers to bypass normal upload restrictions and potentially upload malicious files such as php scripts, html payloads, or other executable content. The vulnerability's severity is amplified by the low privilege requirements needed to exploit it, as Contributor-level access is sufficient to trigger the vulnerable code path, making it particularly dangerous in multi-user environments where less trusted users may have elevated permissions.
The operational impact of this vulnerability extends beyond simple file upload capabilities and creates potential for remote code execution on affected WordPress servers. When authenticated attackers successfully upload malicious files through the vulnerable plugin, they can leverage these uploads to execute arbitrary code on the target system, potentially leading to complete compromise of the WordPress installation. This exploitation pathway aligns with attack patterns documented in the attack tree methodology where initial access through file upload vulnerabilities serves as a foundation for subsequent privilege escalation and system compromise operations. The vulnerability's potential for remote code execution places it within the ATT&CK framework's initial access and execution phases, specifically targeting the T1190 and T1059 techniques.
The technical implementation of this vulnerability demonstrates a classic security misconfiguration where proper input sanitization and validation mechanisms are absent from critical file handling functions. The CWE database would classify this issue under CWE-434, which describes "Unrestricted Upload of File with Dangerous Type," indicating the lack of proper file type validation and content checking. This misconfiguration creates a direct pathway for attackers to bypass WordPress's built-in security measures and upload files that may contain malicious code or payloads designed to establish persistent access to the compromised system.
Organizations using the Qyrr plugin must implement immediate mitigations to protect their WordPress installations from exploitation. The most effective immediate solution involves updating to the latest plugin version where the vulnerability has been patched, though administrators should verify that the update resolves the specific blob_to_file() function validation issues. Additionally, implementing proper file upload restrictions through WordPress configuration and server-level security measures such as restricting upload file types, implementing content validation, and monitoring upload activities can help mitigate the risk. Security monitoring should focus on detecting unusual file upload patterns and unauthorized access attempts to prevent exploitation of this vulnerability. The implementation of web application firewalls and proper access control measures can further reduce the attack surface and prevent unauthorized users from leveraging this privilege escalation path.