Description

Unauthenticated Cross Site Scripting (XSS) in SSL Zen <= 4.7.43 versions.

Executive Summary

Technical Details

Mitigations

References

Additional Metadata

{
  "score": "7.1",
  "pubDate": "2026-08-18T14:17:02.587Z",
  "pubdate": "2026-08-18T14:17:02.587Z",
  "executiveSummary": "An unauthenticated Cross-Site Scripting (XSS) vulnerability has been identified in the SSL Zen plugin in versions 4.7.43 and below. This security flaw enables remote, unauthenticated threat actors to inject malicious client-side scripts, typically JavaScript, into victim browsers via vulnerable application parameters.\nThe primary impact of this vulnerability includes session hijacking, credential theft, unauthorized actions performed on behalf of authenticated users, and defacement of the affected web application. Because the vulnerability requires no authentication, any external attacker with network access to the target web server can initiate exploitation attempts.\nThe affected product is the SSL Zen plugin across all versions up to and including 4.7.43. The risk implications are severe for deployments running vulnerable versions, as successful exploitation compromises the integrity of user sessions and exposes sensitive application data.\nExploitation requirements are minimal, relying primarily on tricking a user into interacting with a specially crafted URL or leveraging an unauthenticated request vector processed insecurely by the vulnerable software.",
  "technicalDetails": "The root cause of the vulnerability stems from insufficient input sanitization and output encoding within the SSL Zen plugin for versions <= 4.7.43. When user-supplied data is processed by the application and subsequently rendered back to the browser without proper context-aware escaping, arbitrary JavaScript execution occurs.\nThe vulnerable component resides within the request handling and parameter processing logic of the SSL Zen plugin. Network exposure is external, meaning attackers over the internet can target the web application endpoint without prior system access.\nAuthentication requirements are absent, classified as unauthenticated, and no specific privileges are required to deliver the malicious payload to the vulnerable parameter. The attack vector involves HTTP requests containing malicious payloads crafted to bypass weak filtering mechanisms.\nThe attack flow proceeds as follows: First, the attacker identifies the vulnerable parameter handled by the SSL Zen plugin. Second, the attacker crafts a malicious URL or request containing a payload consisting of HTML and JavaScript tags (e.g., event handlers or script tags). Third, the victim accesses the maliciously crafted link or is exposed to the injection vector via drive-by methods. Fourth, the server processes the input and reflects it back in the HTTP response without adequate sanitization. Finally, the victim's browser parses the response, executing the injected payload within the security context of the victim's session.\nPayload behavior involves executing arbitrary JavaScript in the Document Object Model (DOM) of the victim's browser. This allows the script to read document.cookie, access local storage, interact with the DOM, and make unauthorized asynchronous requests to the server using the victim's credentials.\nPost-exploitation impact includes complete session compromise, unauthorized administrative actions if an administrative user falls victim to the exploit, and potential pivoting to other client-side functionalities associated with the vulnerable WordPress site."
}