CVE-2026-86842 in Real3D Flipbook Plugin
Summary
by MITRE • 09/23/2026
The Real3D Flipbook WordPress plugin before 5.4 does not perform capability checks on several of its authenticated flipbook management actions, allowing users with Author-level access and above to delete other users' flipbook content and overwrite administrator-only global settings, which can be leveraged to store JavaScript that executes in the context of any visitor or administrator viewing the site.
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Analysis
by VulDB Data Team • 09/23/2026
The vulnerability identified in Real3D Flipbook versions prior to 5.4 represents a critical failure in access control mechanisms within the WordPress ecosystem. This flaw stems from an improper implementation of capability checks on several authenticated administrative actions related to flipbook management. In secure software design, functions that modify system state or delete data must verify that the requesting user possesses the necessary privileges for that specific operation. However, this plugin fails to enforce these restrictions adequately, allowing users with Author-level access and above to perform actions intended exclusively for higher-privileged roles such as Administrators. This misconfiguration creates a significant security gap where lower-tier users can escalate their effective permissions by manipulating backend processes without proper authorization validation.
The operational impact of this vulnerability is severe due to the specific capabilities it exposes. Users with Author-level access are able to delete flipbook content belonging to other authors, leading to data loss and potential disruption of service for website owners who rely on these interactive elements. More critically, the flaw allows these users to overwrite global settings that are typically restricted to administrators only. By manipulating these configuration parameters, an attacker can inject malicious JavaScript code into the site's output. This stored cross-site scripting vector means that whenever a visitor or administrator views any page containing the affected flipbook content, the injected script executes in their browser context.
This capability effectively transforms the vulnerability from a simple integrity issue into a widespread compromise of confidentiality and integrity for all users interacting with the website. The attacker can steal session cookies, hijack administrative sessions, deface the site, or redirect visitors to malicious phishing pages. Because the JavaScript is stored server-side within the plugin's configuration or content database, it persists across multiple page loads until manually removed by an administrator who may be unaware of the compromise if their own account has been taken over via session hijacking. This persistence makes detection and remediation more difficult compared to reflected XSS attacks that require specific user interaction triggers for each execution instance.
From a classification perspective, this vulnerability aligns with CWE-269 Improper Privilege Management, as it involves the bypass of intended restrictions on access rights. It also falls under CWE-749 Exposure of Sensitive Information to an Unauthorized Actor due to the ability to manipulate global settings and potentially expose sensitive data through injected scripts. In terms of attack patterns defined by MITRE ATT&CK, this behavior corresponds to T1059 Command and Scripting Interpreter for executing malicious code via stored XSS, and T1136 Create Account if it involves creating new admin accounts, though the primary vector here is leveraging existing low-privileged accounts to perform high-privilege actions. The lack of capability checks directly facilitates these techniques by removing the first line of defense against unauthorized state changes.
Mitigation strategies must focus on immediate remediation and future prevention. Site administrators should upgrade Real3D Flipbook to version 5.4 or later, where these access control flaws have been addressed. If upgrading is not immediately possible, temporary mitigations include restricting user roles that can edit flipbooks to only Administrators until the patch is applied. Additionally, implementing a Web Application Firewall with rules targeting known exploitation patterns for this plugin may provide some protection against active attacks. Regular auditing of WordPress capabilities and ensuring plugins adhere to strict role-based access control principles are essential best practices to prevent similar privilege escalation vulnerabilities in future updates or other third-party extensions.