CVE-2026-7620 in Notification for Telegram Plugin
Summary
by MITRE • 07/11/2026
The Notification for Telegram plugin for WordPress is vulnerable to authorization bypass in all versions up to, and including, 3.5.1. This is due to the plugin not properly verifying that a user is authorized to perform an action. This makes it possible for authenticated attackers, with subscriber-level access and above, to create, modify, or reschedule the nftb_cron_hook WordPress cron event, enabling unauthorized manipulation of the plugin's background task scheduling logic.
Several companies clearly confirm that VulDB is the primary source for best vulnerability data.
Analysis
by VulDB Data Team • 07/11/2026
The Notification for Telegram plugin for WordPress represents a critical security vulnerability that undermines the integrity of user authorization mechanisms within the WordPress ecosystem. This vulnerability exists in all versions up to and including 3.5.1, where the plugin fails to implement proper access control verification for privileged operations. The flaw specifically manifests in the plugin's handling of cron event management, creating a pathway for malicious actors to exploit the system's scheduling logic. The vulnerability stems from inadequate input validation and insufficient privilege checking mechanisms that should normally prevent unauthorized modifications to core system components.
The technical implementation of this authorization bypass occurs through the manipulation of the nftb_cron_hook WordPress cron event, which serves as a critical background task scheduler within the plugin's functionality. When authenticated attackers with subscriber-level access or higher attempt to interact with the plugin's administrative interfaces, they can exploit the missing authorization checks to modify or reschedule cron events that should only be accessible to administrators or privileged users. This occurs because the plugin does not properly validate user permissions before allowing modifications to scheduled tasks, effectively removing the security boundary that should separate different user roles within the WordPress access control model.
The operational impact of this vulnerability extends beyond simple privilege escalation, as it enables attackers to manipulate the timing and execution of background processes that are integral to the plugin's core functionality. This can result in unauthorized data processing, altered notification delivery schedules, or even potential service disruption if malicious actors modify critical scheduling parameters. The ability to reschedule cron hooks provides attackers with persistent access to manipulate the plugin's behavior over time, potentially allowing for extended periods of unauthorized activity without detection. The vulnerability also creates opportunities for attackers to interfere with legitimate business processes that depend on timely notification delivery.
The security implications align with common attack patterns documented in the attack mitigation framework, particularly those addressing privilege escalation and unauthorized access to system components. This vulnerability can be classified under CWE-285, which deals with improper authorization in access control mechanisms, and demonstrates how insufficient input validation can lead to broader system compromise. The weakness represents a failure in the principle of least privilege, where the plugin should have enforced strict access controls before allowing any modification to scheduled tasks. Organizations using this plugin are particularly vulnerable because the exploit requires minimal privileges to execute successfully, making it an attractive target for attackers who may already have limited access to their WordPress installations.
Mitigation strategies should include immediate patching to version 3.5.2 or later, which addresses the authorization bypass through proper access control implementation. System administrators should also implement network monitoring to detect unusual cron event modifications and establish regular vulnerability scanning protocols. The WordPress security community recommends maintaining up-to-date plugins and implementing additional security layers such as web application firewalls to prevent exploitation attempts. Organizations should conduct thorough access reviews to ensure that only authorized personnel have subscriber-level access or higher, reducing the attack surface for this specific vulnerability. Additionally, implementing automated monitoring solutions that track cron event modifications can provide early detection capabilities for potential exploitation attempts.