CVE-2026-78528 in BerqWP Plugin
Summary
by MITRE • 09/17/2026
Unauthenticated Broken Access Control in BerqWP <= 4.1.15 versions.
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Analysis
by VulDB Data Team • 09/17/2026
The vulnerability identified as an unbroken access control issue within BerqWP versions prior to or equal to 4.1.15 represents a critical failure in the application's security architecture, specifically concerning authentication mechanisms and role-based permissions. This flaw allows attackers who have not yet authenticated themselves against the WordPress platform to perform administrative actions that should strictly be reserved for authorized users with elevated privileges. In typical web applications, particularly those built on frameworks like WordPress, access control checks are designed to verify user identity and permission levels before executing sensitive operations such as modifying site settings, managing plugins, or altering content structures. The absence of these necessary verification steps in BerqWP creates a direct pathway for unauthorized entities to interact with the application's backend logic without providing valid credentials.
From a technical perspective, this vulnerability stems from insufficient validation of user roles and session states during request processing. When an unauthenticated actor sends requests to specific endpoints or utilizes certain features within the plugin, the server fails to enforce mandatory access controls that would otherwise reject such attempts. This misconfiguration effectively bypasses the standard authentication gatekeepers, allowing actions like creating new administrator accounts, changing site configurations, or potentially executing code depending on the specific functions exposed by the vulnerable version. The root cause lies in the developer's oversight of implementing robust checks for user capability before processing state-changing requests, a common pitfall in plugin development where security assumptions are sometimes made without rigorous testing against unauthenticated attack vectors.
The operational impact of this vulnerability is severe due to its potential for complete system compromise. An attacker can exploit this flaw to gain full administrative control over the WordPress installation. This level of access enables the injection of malicious code, such as web shells or backdoors, which can lead further into network infiltration and data exfiltration. Furthermore, because BerqWP is a plugin that likely interacts with other parts of the CMS ecosystem, compromising it may serve as an entry point for broader attacks against the underlying server infrastructure. The ability to create new administrator accounts ensures persistent access even if initial credentials are discovered or changed by site owners, making remediation difficult without manual intervention and thorough auditing of user roles.
This vulnerability aligns with CWE-284, which describes Improper Access Control, specifically highlighting failures in enforcing restrictions on actions performed by unauthenticated users. It also maps to the MITRE ATT&CK framework under techniques related to Initial Access and Privilege Escalation, particularly those involving exploitation of software vulnerabilities for unauthorized access. Security professionals should note that this type of flaw is often exploited using automated tools that scan for known vulnerable versions or test common administrative endpoints without authentication headers.
To mitigate this risk, immediate action is required by upgrading BerqWP to a version later than 4.1.15 where the developer has presumably implemented proper access control checks and validated user permissions before allowing sensitive operations. Until an update can be applied, site administrators should consider restricting public access to administrative areas through IP whitelisting or additional web application firewall rules that block unauthenticated requests to known vulnerable endpoints. Regular security audits and penetration testing are recommended to identify similar misconfigurations in other plugins or themes within the WordPress environment, ensuring a holistic approach to maintaining the integrity of the content management system against unauthorized access attempts.