CVE-2026-4562: Php

Overview

A significant security vulnerability, identified as CVE-2026-4562, has been discovered in MacCMS 2025.1000.4052. This flaw resides within the Timming API component, specifically in the application/api/controller/Timming.php file. The vulnerability allows attackers to bypass authentication checks entirely, providing unauthorized access to functionality intended for privileged use only. As the exploit is publicly available, the risk of active attacks is high.

Vulnerability Details

In simple terms, this is a missing authentication flaw. The Timming API endpoint does not properly verify the identity of a user before allowing access. Think of it like a secure building where a specific back door has been left unlocked and without a guard; anyone who finds it can walk right in. This manipulation can be performed remotely over the network, meaning an attacker does not need physical or local access to the server hosting MacCMS.

Impact and Risks

The primary risk is unauthorized access to the Timming API’s functions. Depending on what actions this API controls, attackers could potentially:

• Access, modify, or delete sensitive data.
• Disrupt site operations or functionality.
• Use the access as a foothold for further attacks within the system. With a CVSS score of 7.3 (HIGH), this vulnerability represents a substantial threat to the confidentiality and integrity of affected websites. Organizations should treat this as an urgent issue, especially given the public release of the exploit. For context on how such breaches can unfold, recent incidents are detailed in our breach reports.

Remediation and Mitigation

Immediate action is required to secure affected systems.

1. Update Immediately: The most effective remediation is to upgrade MacCMS to a patched version. Contact the MacCMS vendor or check their official channels for a security update that addresses CVE-2026-4562. Do not run vulnerable versions (specifically 2025.1000.4052).
2. Temporary Mitigation: If an immediate update is not possible, consider disabling the affected Timming API endpoint if it is not critically required for your site’s function. Implement strict network access controls (e.g., firewalls) to limit access to the MacCMS administration and API interfaces to only trusted IP addresses.
3. Monitor for Suspicious Activity: Review server and application logs for any unusual access patterns to the Timming.php file or its associated API paths. Look for requests from unexpected geographic locations or at unusual times.

Stay informed on emerging threats by following the latest security news. For all administrators using MacCMS, prioritizing this update is crucial to protect your web assets from compromise.