CVE-2026-87981 in Paymob for WooCommerce Plugin
Summary
by MITRE • 09/23/2026
The Paymob for WooCommerce WordPress plugin before 4.1.14 does not perform a capability check on several admin AJAX actions that manage its payment-gateway configuration, allowing users with contributor-level access to delete, wipe, or modify that configuration, including the stored payment credentials.
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Analysis
by VulDB Data Team • 09/23/2026
The vulnerability identified in Paymob for WooCommerce WordPress plugin versions prior to 4.1.14 represents a critical failure in server-side authorization controls within an administrative context. This flaw specifically affects several AJAX endpoints responsible for managing the payment gateway's configuration settings. In secure web application architecture, any action that modifies sensitive system state or exposes confidential data must be protected by robust capability checks that verify whether the initiating user possesses the necessary privileges to perform such operations. The absence of these checks in this plugin creates a significant security gap where lower-privileged users can execute administrative functions intended exclusively for administrators with elevated access levels.
From a technical perspective, the core issue lies in the implementation of WordPress AJAX handlers which do not invoke standard capability verification mechanisms before processing requests related to payment gateway configuration. These endpoints allow operations such as deleting existing configurations, wiping stored data, or modifying critical parameters including API keys and other authentication credentials required for transaction processing. Because these actions are exposed via public-facing AJAX URLs that accept POST requests from any authenticated user session, the lack of permission validation allows attackers with minimal access rights to interact directly with sensitive backend logic without triggering appropriate error responses or access denials.
The operational impact of this vulnerability is severe due to the nature of the data involved. Payment gateway configurations typically contain high-value secrets such as merchant API keys, secret tokens, and webhook URLs that are essential for processing financial transactions securely. If an attacker successfully exploits this flaw, they can alter these credentials or remove them entirely, leading to immediate disruption of payment services. Furthermore, by modifying the configuration, a contributor-level user could potentially redirect transaction data to malicious endpoints or inject fraudulent settings that compromise the integrity of future payments. This effectively grants unauthorized users administrative control over financial infrastructure despite their nominal role restrictions within the WordPress ecosystem.
This vulnerability aligns with CWE-862, which describes Missing Authorization, as well as CWE-913 regarding improper control of frequency-limiting parameters if rate limiting is also absent, though the primary classification remains a failure in access control enforcement. In terms of attack vectors and tactics, this scenario maps to MITRE ATT&CK technique T1078, specifically Valid Accounts, where an attacker leverages legitimate but low-privileged credentials to perform unauthorized administrative actions. It also relates to T1496, Resource Hijacking, if the modification leads to financial fraud or service disruption that impacts business operations. The exploitation does not require complex injection techniques or remote code execution; it relies solely on crafting valid HTTP requests with appropriate authentication cookies from a compromised low-privilege account.
Mitigation strategies must prioritize immediate patching and access control hardening. Users running versions of the Paymob for WooCommerce plugin earlier than 4.1.14 should upgrade to the latest stable release where these capability checks have been implemented by the developers. In environments where upgrading is not immediately feasible, administrators can implement temporary compensating controls such as restricting AJAX endpoint access through web application firewall rules or custom code snippets that enforce role-based permissions before processing configuration changes. Additionally, auditing user roles and ensuring that only trusted individuals hold contributor-level accounts with potential exposure to administrative interfaces reduces the attack surface significantly. Regular security audits of plugin codebases for proper use of WordPress capability functions like current_user_can are essential to prevent similar authorization bypasses in future updates or other plugins within the same ecosystem.