Description

Unauthenticated Cross Site Scripting (XSS) in Event Tickets <= 5.29.2.1 versions.

Executive Summary

Technical Details

Mitigations

References

Additional Metadata

{
  "score": "7.1",
  "pubDate": "2026-08-24T22:17:20.133Z",
  "pubdate": "2026-08-24T22:17:20.133Z",
  "executiveSummary": "An unauthenticated Cross-Site Scripting (XSS) vulnerability has been identified in the Event Tickets plugin affecting versions 5.29.2.1 and prior. This security flaw allows remote, unauthenticated threat actors to inject malicious scripts, typically JavaScript, into vulnerable input fields or endpoints processed by the application. When an unsuspecting user or administrator renders the compromised page within their browser, the injected payload executes within the context of their session.\nThe primary impact of this vulnerability includes session hijacking, credential theft, unauthorized actions performed on behalf of the victim, and potential defacement of the affected web application. Because exploitation does not require prior authentication or privileged access, the attack surface is significantly broadened, exposing any deployment running vulnerable versions to automated exploitation over the network.\nRisk implications are severe for organizations relying on the ticketing platform for user interaction and event management, as successful attacks compromise the confidentiality, integrity, and availability of client-side application logic. Mitigation strictly requires upgrading the Event Tickets plugin to a patched version subsequent to 5.29.2.1 as soon as officially available, alongside implementing robust output encoding practices.",
  "technicalDetails": "The vulnerability stems from improper neutralization of user-supplied input before it is rendered within the Document Object Model (DOM) by the Event Tickets plugin. Specifically, the vulnerable component fails to enforce adequate context-aware output encoding or strict input sanitization on parameters processed by the application.\nAttackers exploit this flaw by crafting malicious HTTP requests containing arbitrary script payloads—such as script tags or event handlers—targeted at vulnerable endpoints handled by the affected software. Since the system lacks authentication requirements, any remote user can transmit the malicious payload directly over the network without possessing valid user credentials or elevated privileges.\nThe attack flow proceeds as follows: First, the unauthenticated attacker crafts a URL or form submission containing the malicious JavaScript payload designed to target the vulnerable parameters in Event Tickets. Second, the server processes the input and stores or reflects it back within the HTTP response without proper sanitization. Third, the victim's browser receives the HTTP response containing the unencoded payload and parses it as executable script code.\nOnce executed in the victim's browser, the payload operates with the privileges of the victim's active session. If the victim happens to be an administrative user, the script can perform privileged actions such as creating malicious administrative accounts, modifying site configurations, or exfiltrating sensitive session cookies and tokens via asynchronous HTTP requests to attacker-controlled infrastructure. The post-exploitation impact spans full client-side takeover within the scope of the affected application."
}