CVE-2026-5727 in Hello Plus Plugin
Summary
by MITRE • 10/10/2026
The Hello Plus plugin for WordPress is vulnerable to authorization bypass in all versions up to, and including, 1.7.7. 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 Contributor-level access and above, to publish their own Hello+ header/footer templates and draft currently active templates owned by higher-privileged users.
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Analysis
by VulDB Data Team • 10/10/2026
The vulnerability identified in the Hello Plus plugin for WordPress represents a critical authorization bypass flaw affecting all versions up to and including 1.7.7. This security defect stems from an insufficient verification of user permissions when executing administrative or configuration-related actions within the plugin's interface. Specifically, the application fails to enforce proper access controls on endpoints responsible for managing header and footer templates. Consequently, any authenticated user possessing Contributor-level privileges or higher can manipulate these settings without adequate authorization checks. This lack of server-side validation allows lower-privileged users to perform actions that should be restricted to administrators or editors with specific template management rights.
From a technical perspective, the core issue lies in the absence of robust role-based access control mechanisms during the processing of requests related to Hello+ header and footer templates. When an authenticated user submits data to create or modify these templates, the backend logic does not adequately verify whether the requesting user holds the necessary privileges to perform such operations. This oversight enables attackers with Contributor-level access or above to publish their own custom template configurations. Furthermore, the vulnerability extends beyond mere creation of new assets; it allows malicious actors to draft currently active templates owned by higher-privileged users. This capability effectively grants unauthorized individuals control over critical visual elements of the website, potentially leading to defacement or further exploitation vectors depending on how these templates are rendered and integrated into the site's frontend.
The operational impact of this vulnerability is significant for organizations relying on WordPress sites with multiple user roles. An attacker exploiting this flaw can inject malicious code through custom HTML or JavaScript within the header or footer sections, which are typically loaded on every page view. This could facilitate cross-site scripting attacks against visitors, session hijacking if sensitive cookies are accessible via injected scripts, or phishing attempts by altering site branding and content to mimic legitimate pages. Additionally, the ability to draft active templates owned by administrators suggests a potential for privilege escalation scenarios where an attacker might manipulate system behavior in ways that disrupt service availability or compromise data integrity. The persistence of these changes means that even after initial detection, residual malicious code may remain embedded within the site's configuration unless thoroughly audited and cleaned.
To mitigate this risk, immediate action is required to update the Hello Plus plugin to a version newer than 1.7.7 where the authorization checks have been properly implemented. Administrators should also review user roles on their WordPress installations to ensure that only trusted individuals with appropriate administrative responsibilities are granted Contributor-level or higher access. Implementing strict role-based access control policies and regularly auditing user permissions can help prevent similar vulnerabilities from being exploited in the future. Additionally, deploying a web application firewall may provide an additional layer of defense by detecting and blocking suspicious requests associated with unauthorized template modifications. Regular security assessments and penetration testing should be conducted to identify and remediate any remaining authorization flaws within custom plugins or themes used on the platform.
This vulnerability aligns with CWE-284 Improper Access Control, as it involves a failure to restrict access to resources based on user roles. It also corresponds to MITRE ATT&CK technique T1098 Account Manipulation, specifically in the context of adding credentials or modifying account permissions indirectly through unauthorized configuration changes. By addressing these gaps and adhering to secure coding practices that emphasize rigorous input validation and permission verification, organizations can significantly reduce their attack surface and protect against exploitation of such authorization bypass flaws.