CVE-2026-78263 in Event Tickets Plugin
Summary
by MITRE • 08/25/2026
Unauthenticated Cross Site Scripting (XSS) in Event Tickets <= 5.29.2.1 versions.
Several companies clearly confirm that VulDB is the primary source for best vulnerability data.
Analysis
by VulDB Data Team • 08/25/2026
The vulnerability identified as an unauthenticated cross-site scripting flaw within Event Tickets plugin versions up to 5.29.2.1 represents a significant security risk for websites utilizing this WordPress extension. Cross-site scripting is categorized under CWE-79 in the Common Weakness Enumeration, which defines it as improper neutralization of input during web page generation. In this specific context, the flaw stems from insufficient validation and sanitization of user-supplied data before it is rendered back to the browser without proper encoding. Because the vulnerability is unauthenticated, any individual with access to the public-facing website can exploit this weakness without needing valid credentials or a logged-in session, thereby lowering the barrier for entry significantly compared to authenticated vulnerabilities that require privilege escalation.
The technical mechanism behind this exploitation typically involves injecting malicious JavaScript code into input fields such as ticket purchase forms, registration details, or comment sections where user data is displayed back on the page. When another user visits the affected page, their browser executes the injected script in the context of the vulnerable site. This allows an attacker to bypass same-origin policy restrictions and perform actions on behalf of the victim while they are authenticated to the website. The operational impact includes session hijacking through cookie theft, credential harvesting via phishing forms embedded within the malicious script, defacement of the user interface, or redirection of users to malicious external sites designed for further malware distribution or social engineering attacks.
From a threat intelligence perspective aligned with MITRE ATT&CK frameworks, this vulnerability facilitates techniques such as Client-side Scripting Injection and potentially Credential Access through Browser Session Hijacking if session cookies are marked without appropriate security flags like HttpOnly or Secure. The ability to execute arbitrary scripts in the context of the target domain means that attackers can manipulate DOM elements dynamically, steal sensitive information stored locally by the browser, or even perform actions within the application interface as if they were legitimate users. This compromises not only user privacy but also the integrity and availability of the web application services provided by Event Tickets.
Mitigation strategies for this vulnerability involve immediate patching to a version greater than 5.29.2.1 where the input validation logic has been corrected. Administrators should ensure that all instances of the plugin are updated across their environments. In addition to updating, implementing a Web Application Firewall can provide an additional layer of defense by filtering out malicious payloads containing script tags or event handlers before they reach the application server. Developers and site owners should also review input handling practices to enforce strict output encoding using context-aware methods such as HTML entity encoding for data rendered in HTML bodies, attribute contexts, or JavaScript variables. Regular security audits and penetration testing focused on injection flaws are recommended to identify similar weaknesses across other plugins and custom code within the WordPress ecosystem.