Description

Unauthenticated Cross Site Scripting (XSS) in Tagembed <= 7.4 versions.

Executive Summary

Technical Details

Mitigations

References

Additional Metadata

{
  "score": "7.1",
  "pubDate": "2026-08-20T12:16:32.930Z",
  "pubdate": "2026-08-20T12:16:32.930Z",
  "executiveSummary": "An unauthenticated Cross-Site Scripting (XSS) vulnerability has been identified in the Tagembed product affecting versions 7.4 and prior. This security flaw enables remote attackers to inject malicious client-side scripts, typically JavaScript, into vulnerable web pages rendered by the application. The primary impact of this vulnerability includes potential session hijacking, unauthorized access to sensitive user data, credential theft, and defacement of the affected web application. Because the vulnerability is unauthenticated, threat actors require no prior access, privileges, or user interaction beyond inducing a victim to execute the attack vector. The risk implications are severe, as successful exploitation undermines the integrity and confidentiality of the web application and its user base. Exploitation requirements are minimal, relying primarily on the lack of proper input sanitization and output encoding within the vulnerable Tagembed component. Remediation requires updating the software to a patched version beyond 7.4 or implementing robust input validation and output encoding mechanisms to neutralize malicious payloads.",
  "technicalDetails": "The vulnerability resides in the Tagembed component, specifically affecting versions 7.4 and below. The root cause of the security defect stems from improper neutralization of user-supplied input during web page generation, leading to a Cross-Site Scripting (XSS) vulnerability. Specifically, the application fails to adequately sanitize or encode data parameters before reflecting or rendering them back to the client browser within the Document Object Model (DOM).\nFrom a network exposure perspective, the vulnerable component is accessible over the network without requiring authentication, lowering the barrier to entry for malicious actors. No privilege requirements are mandated for initiating the attack, meaning any anonymous user can craft and deliver an exploit payload.\nThe attack flow proceeds as follows: First, the attacker identifies an injection vector within the Tagembed integration where unsanitized input is processed and rendered by the web application. Second, the attacker crafts a malicious payload containing executable JavaScript encapsulated within HTML tags or event handlers. Third, the attacker delivers this payload to the target application via HTTP requests, leveraging the unauthenticated nature of the endpoint. Fourth, when a victim retrieves the affected resource, the application reflects or stores the malicious script without appropriate context-aware output encoding. Finally, the victim's browser executes the script within the security context of the vulnerable origin.\nThe behavior of the injected payload executes within the Document Object Model of the victim's session, granting the malicious script access to sensitive browser storage mechanisms such as cookies, SessionStorage, and LocalStorage. Post-exploitation impact encompasses session token theft, unauthorized API requests performed on behalf of the authenticated user, keylogging, and redirection to malicious external domains."
}