CVE-2026-116394 in Evently Plugin
Summary
by MITRE • 10/26/2026
Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS) vulnerability in Magepeople inc. WpEvently mage-eventpress allows Code Injection.This issue affects WpEvently: from n/a through 5.7.9.
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Analysis
by VulDB Data Team • 10/26/2026
The identified security flaw represents a classic Cross-Site Scripting vulnerability, specifically categorized under CWE-80 as Improper Neutralization of Script-Related HTML Tags in a Web Page. This type of weakness occurs when an application accepts untrusted input and includes it within the context of a web page without proper validation or encoding. In this specific instance affecting Magepeople Inc.'s WpEvently plugin, also known as mage-eventpress, the system fails to adequately sanitize user-supplied data before rendering it in HTML responses. This oversight allows an attacker to inject malicious script tags into the application's output, which are then executed by the victim's web browser when they view the affected page. The vulnerability spans versions from n/a through 5.7.9, indicating a long-standing issue that has persisted across multiple releases of the software.
From a technical perspective, this flaw enables Code Injection attacks where an attacker can execute arbitrary JavaScript code in the context of the victim's session. This is not merely a display error but a critical execution vulnerability because scripts injected via XSS run with the same permissions as the rest of the website. Consequently, attackers can manipulate DOM elements, steal sensitive cookies or session tokens, perform actions on behalf of the user without their consent, and redirect users to malicious sites designed for phishing or further malware distribution. The impact is severe because it compromises the confidentiality, integrity, and availability of the web application's data and functionality. Users interacting with compromised event pages may find their accounts hijacked or their personal information exfiltrated to remote servers controlled by the attacker.
In terms of threat modeling, this vulnerability aligns with MITRE ATT&CK technique T1059.007, which covers JavaScript execution within web browsers. Attackers typically exploit such flaws through stored XSS vectors where malicious scripts are saved into a database and served to other users upon request, or reflected XSS vectors where the script is immediately returned in an HTTP response. Given that WpEvently handles event data likely submitted by various users including organizers and attendees, the risk of persistent storage-based exploitation is high. Once executed, the injected code can interact with the browser's local storage, access authentication cookies, and send requests to external domains, effectively bypassing same-origin policies if not properly configured or if additional vulnerabilities exist in session management.
Mitigation strategies must focus on implementing robust input validation and output encoding mechanisms. Developers should ensure that all user-supplied data is strictly validated against a whitelist of allowed characters before processing. More importantly, when rendering this data back to the browser, it must be encoded using context-appropriate methods such as HTML entity encoding for general text content or JavaScript string escaping if inserted into script blocks. Utilizing Content Security Policy headers can also provide an additional layer of defense by restricting the sources from which scripts are allowed to load and execute. For immediate remediation, users running affected versions should upgrade to a patched release that addresses this sanitization failure. Until updates are applied, administrators might consider implementing Web Application Firewall rules designed to detect and block common XSS payloads in HTTP requests targeting vulnerable endpoints.