Description

Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in themeStek ThemeStek Extras for LabtechCO Theme themestek-labtechco-extras allows Reflected XSS.This issue affects ThemeStek Extras for LabtechCO Theme: from n/a through 8.4.

Executive Summary

Technical Details

Mitigations

References

Additional Metadata

{
  "score": "7.1",
  "pubDate": "2026-10-10T17:17:01.090Z",
  "pubdate": "2026-10-10T17:17:01.090Z",
  "executiveSummary": "The ThemeStek Extras plugin for the LabtechCO theme is susceptible to a Reflected Cross-Site Scripting (XSS) vulnerability. This security flaw originates from improper neutralization of user-supplied input during web page generation, allowing an attacker to inject and execute arbitrary malicious scripts within the context of a victim's browser session.\nThe vulnerability affects all versions of the ThemeStek Extras plugin from n/a through 8.4. By crafting a specifically engineered URL containing malicious JavaScript, an attacker can coerce an authenticated or unauthenticated user into executing code without their consent.\nThe impact of this vulnerability is significant, as it enables attackers to perform unauthorized actions on behalf of the victim, steal session cookies, capture sensitive information, or perform full-page defacement. Since the malicious script executes within the security context of the target site, it can bypass traditional Same-Origin Policy (SOP) protections. There are no authentication requirements for an attacker to initiate this attack, making it reachable via standard web vectors. Organizations using the affected LabtechCO theme components should treat this as a high-priority risk and implement restrictive input sanitization policies while awaiting potential vendor-provided security patches.",
  "technicalDetails": "The vulnerability is classified under CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting'). The root cause of this flaw lies in the application's failure to adequately sanitize or encode user-provided input parameters before reflecting them back to the HTTP response body.\nIn the affected versions (n/a through 8.4), the ThemeStek Extras plugin processes GET or POST parameters that are directly rendered into the HTML document. When an application accepts input and embeds it into the DOM without sufficient output encoding (such as converting special characters like '<', '>', '&', and '\"' into their corresponding HTML entities), the browser interprets the input as executable code rather than plain text.\nThe exploitation flow typically follows these steps: First, the attacker identifies a URL parameter or input field processed by the ThemeStek Extras plugin that is reflected in the server response. Second, the attacker crafts a malicious payload containing JavaScript, such as '<script>alert(document.cookie)</script>' or more sophisticated obfuscated code designed to exfiltrate session identifiers to an attacker-controlled listener. Third, the attacker distributes the weaponized URL to targeted users through phishing, social engineering, or public forum posts. Finally, when the victim navigates to the malicious link, the vulnerable server reflects the injected script, and the victim's browser executes the payload within the active session.\nBecause the execution happens on the client side, the victim's browser treats the script as legitimate code originating from the trusted domain. This allows for session hijacking, where the attacker can obtain administrative session tokens if an administrator clicks the link. Furthermore, the attacker can leverage this primitive to perform cross-site request forgery (CSRF) bypasses or inject content that alters the visual integrity of the site to facilitate credential harvesting (e.g., overlaying fake login forms). The vulnerability does not require authentication; however, the impact is magnified if the victim possesses higher-level administrative privileges, as the XSS payload can be used to make changes to the WordPress configuration, install rogue plugins, or create new administrative user accounts via background API calls."
}