CVE-2025-39489 in CouponXL Plugin
Summary
by MITRE • 05/23/2025
Incorrect Privilege Assignment vulnerability in pebas CouponXL allows Privilege Escalation. This issue affects CouponXL: from n/a through 4.5.0.
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Analysis
by VulDB Data Team • 05/23/2025
The CVE-2025-39489 vulnerability represents a critical privilege assignment flaw within the pebas CouponXL plugin that enables unauthorized privilege escalation attacks. This vulnerability exists in versions ranging from the initial release through 4.5.0, indicating a prolonged exposure window where malicious actors could exploit this weakness to gain elevated system access. The issue falls under the category of improper privilege management, which directly violates fundamental security principles of least privilege and access control enforcement.
The technical flaw manifests in how the CouponXL plugin handles user role assignments and permission checks during administrative operations. When users with limited privileges attempt to perform certain administrative functions, the system fails to properly validate their authorization levels, allowing them to execute actions typically restricted to higher-privileged users. This misconfiguration creates a pathway for attackers to escalate their privileges without proper authentication or authorization, effectively bypassing the intended access control mechanisms. The vulnerability is particularly dangerous because it operates at the privilege assignment level rather than in the application logic itself, making it more subtle and harder to detect through standard security scanning tools.
The operational impact of this vulnerability extends beyond simple privilege escalation, as it can enable attackers to fully compromise the affected system. Once an attacker successfully exploits this flaw, they can manipulate user accounts, modify coupon data, access sensitive information, and potentially gain complete administrative control over the WordPress installation. This vulnerability particularly affects e-commerce and coupon management environments where user data and transaction information are stored, creating opportunities for data breaches and financial fraud. The exposure across multiple versions suggests that organizations using CouponXL within this range may have been vulnerable for an extended period, increasing the potential attack surface and data exposure risk.
Organizations affected by this vulnerability should immediately implement mitigation strategies including updating to the latest patched version of the CouponXL plugin, reviewing and tightening user role assignments, and implementing additional access controls. The flaw aligns with CWE-276, which addresses improper privilege assignment, and represents a clear violation of the principle of least privilege that forms the foundation of secure system design. From an ATT&CK framework perspective, this vulnerability maps to privilege escalation techniques and can be leveraged as part of broader attack chains targeting web applications. Security teams should conduct comprehensive audits of user permissions and access controls, implement network segmentation, and monitor for suspicious administrative activities that may indicate exploitation attempts. Additionally, organizations should consider implementing web application firewalls and intrusion detection systems to help identify and block exploitation attempts targeting this specific vulnerability.