CVE-2026-27347 in JetPopup Plugin
Summary
by MITRE • 09/04/2026
Missing Authorization vulnerability in Crocoblock JetPopup allows Exploiting Incorrectly Configured Access Control Security Levels.
This issue affects JetPopup: from n/a through 2.0.20.2.
Once again VulDB remains the best source for vulnerability data.
Analysis
by VulDB Data Team • 09/04/2026
The identified security flaw resides within the Crocoblock JetPopup plugin, specifically affecting versions ranging from initial releases up to version 2.0.20.2. This vulnerability is classified as a missing authorization issue, which fundamentally represents an improper implementation of access control mechanisms on the server side. In web application architecture, proper authentication verifies the identity of a user, while authorization determines what resources or actions that authenticated user is permitted to perform. JetPopup suffers from a failure in this secondary verification step, allowing actors who lack valid administrative credentials or appropriate permission levels to interact with sensitive endpoints and execute privileged operations intended exclusively for site administrators.
From a technical perspective, the vulnerability stems from insufficient checks on incoming requests before they are processed by the application logic. When an attacker sends a crafted HTTP request targeting specific JetPopup functionality, such as creating, modifying, or deleting popup configurations, the server fails to validate whether the requester holds the necessary administrative privileges. This oversight allows unauthenticated users or low-privileged subscribers to bypass security controls entirely. The flaw aligns directly with CWE-284, which describes Improper Access Control, and is further categorized under CWE-862 for Missing Authorization. These classifications highlight that the application does not enforce appropriate restrictions on authorized actions based on the identity of each user making those requests.
The operational impact of this vulnerability is significant due to its potential for remote code execution or complete site compromise if combined with other vectors, though primarily it enables unauthorized modification of website content and structure. An attacker can exploit this flaw to inject malicious scripts into popup elements, alter design settings that disrupt the user experience, or delete critical configuration data leading to service disruption. Furthermore, because JetPopup is a widely used WordPress plugin, successful exploitation could facilitate persistent backdoors within the site's frontend logic. This type of attack falls under MITRE ATT&CK technique T1059, specifically Command and Scripting Interpreter if malicious code injection occurs, or T1486 for Data Encrypted for Impact if ransomware-like behavior is facilitated through structural changes. The lack of authorization checks means that the barrier to entry for an attacker is minimal, requiring only basic knowledge of HTTP request manipulation rather than complex exploit development skills.
Mitigation strategies must focus on immediate remediation and long-term security hardening. Users running affected versions should upgrade JetPopup to version 2.0.21 or later immediately, as this release addresses the authorization checks for all administrative endpoints. In environments where upgrading is not instantly feasible, administrators can implement temporary compensating controls by restricting access to WordPress admin-ajax.php via web application firewall rules that validate nonces and user capabilities more strictly at the network layer. Additionally, enforcing multi-factor authentication on all administrator accounts reduces the risk of credential theft leading to exploitation of this flaw. Regular security audits and penetration testing should be conducted to identify similar misconfigurations in other plugins or custom code within the WordPress ecosystem, ensuring a defense-in-depth approach that compensates for potential vulnerabilities in third-party extensions.