CVE-2026-39760 in Real 3D FlipBook Plugin
Summary
by MITRE • 10/06/2026
Unauthenticated Cross Site Scripting (XSS) in Real 3D FlipBook <= 5.5 versions.
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Analysis
by VulDB Data Team • 10/06/2026
The vulnerability identified as an unauthenticated cross-site scripting flaw within the Real 3D FlipBook plugin for WordPress, affecting versions up to and including 5.5, represents a significant security risk due to its lack of authentication requirements. This specific characteristic allows any remote attacker with network access to the targeted web application to exploit the weakness without needing valid credentials or prior interaction with an authenticated user session. The core technical flaw stems from insufficient sanitization and validation of user-supplied input within the plugin's handling mechanisms, likely in parameters related to book configuration, URL redirection, or dynamic content rendering that are processed by the server-side PHP code before being reflected back into the HTML response sent to the client browser.
From a technical perspective, this vulnerability aligns with CWE-79, which describes Improper Neutralization of Input During Web Page Generation commonly known as Cross-site Scripting. The attacker can inject malicious JavaScript payloads into input fields or URL parameters that are subsequently rendered by the victim's web browser without proper encoding. Because the plugin generates interactive 3D flipbook experiences, it likely relies heavily on client-side scripting to manage page turns, animations, and media playback. If these scripts do not adequately escape special characters such as angle brackets, quotes, and ampersands in user-controlled data, an injected script will execute within the context of the victim's session with the website hosting the flipbook content.
The operational impact of this vulnerability is severe because it enables a wide range of malicious activities that compromise both end-user privacy and potentially administrative control over the web application. Attackers can steal sensitive information such as session cookies, which may allow them to hijack user sessions if secure cookie flags are not properly configured or if the victim has an active authenticated session on the same domain. Furthermore, the attacker can perform actions on behalf of the victim, manipulate page content to display phishing forms that mimic legitimate login pages, redirect users to malicious sites hosting malware, or deface the website's appearance. In environments where multiple administrators manage content, this could lead to privilege escalation if combined with other vulnerabilities or social engineering tactics aimed at administrative accounts.
This type of attack is categorized under MITRE ATT&CK technique T1059, specifically Command and Scripting Interpretation via JavaScript, as it involves executing arbitrary code within the browser environment. It also relates to T1189 Drive-by Compromise if the payload leads to further exploitation or malware download through exploit kits hosted on external malicious servers linked from the injected script. The unauthenticated nature of this flaw means that the attack surface is broad, potentially affecting any visitor who views a page containing an affected flipbook component, thereby increasing the likelihood of successful compromise compared to authenticated-only vulnerabilities.
Mitigation strategies must focus on immediate remediation and long-term defensive measures. The primary solution is to upgrade the Real 3D FlipBook plugin to version 5.6 or later where this vulnerability has been patched by implementing proper input validation and output encoding techniques such as HTML entity encoding for all user-supplied data before rendering it in the DOM. Administrators should also ensure that Content Security Policy headers are implemented on their web servers to restrict the sources from which scripts can be loaded, thereby mitigating the impact of any successful XSS injection even if patching is delayed temporarily. Additionally, enabling HTTP-only flags on session cookies and using Secure attributes for cookie transmission over HTTPS will reduce the risk of data theft resulting from this vulnerability. Regular security audits and penetration testing should be conducted to identify similar input handling flaws in other plugins or custom code within the WordPress environment.