Description

Unauthenticated Cross Site Scripting (XSS) in Smart Forms <= 2.6.104 versions.

Executive Summary

Technical Details

Mitigations

References

Additional Metadata

{
  "score": "7.1",
  "pubDate": "2026-10-06T09:17:43.000Z",
  "pubdate": "2026-10-06T09:17:43.000Z",
  "executiveSummary": "Smart Forms versions 2.6.104 and earlier are susceptible to an unauthenticated Cross-Site Scripting (XSS) vulnerability. This security flaw enables remote, unauthenticated attackers to inject malicious JavaScript into the application's client-side environment. By bypassing authentication requirements, threat actors can execute arbitrary scripts within the context of a victim's browser session. The primary risk associated with this vulnerability includes the unauthorized theft of sensitive session cookies, session hijacking, phishing through dynamic content modification, and the potential redirection of users to malicious external domains. Given the unauthenticated nature of this flaw, it represents a critical risk to the confidentiality and integrity of user interactions within the Smart Forms platform. Organizations relying on affected versions are vulnerable to web-based attacks that require minimal user interaction, potentially leading to full compromise of client-side data processed by the vulnerable component.",
  "technicalDetails": "The vulnerability resides in the input handling mechanism of the Smart Forms plugin, which fails to adequately sanitize or encode user-supplied data before reflecting it in the application's Document Object Model (DOM). This improper input validation allows for the injection of arbitrary HTML and JavaScript payloads into the affected page context. Because the vulnerability exists in an unauthenticated endpoint, no prior access or user authorization is required to trigger the exploit.\nThe root cause is identified as an insufficient sanitization process within the processing functions of Smart Forms versions <= 2.6.104. When a request is crafted with malicious parameters, the application fails to distinguish between legitimate form data and executable script tags. Consequently, the server reflects the malicious payload back to the browser, where the victim's client executes the script as a trusted component of the origin site.\nThe attack flow proceeds as follows: First, the attacker identifies a vulnerable input field or URL parameter exposed by the Smart Forms component that interacts with the client-side UI. Second, the attacker constructs a crafted URI containing a malicious JavaScript payload, such as a script tag designed to exfiltrate document.cookie or perform unauthorized actions via the victim's session. Third, the attacker distributes this payload through social engineering, direct links, or automated web crawling. Upon the victim clicking the link or navigating to the maliciously crafted URL, the Smart Forms application renders the input without proper contextual output encoding. The victim's browser, interpreting the reflected input as valid code, executes the attacker-supplied script.\nThe impact of successful exploitation is broad. Because the malicious code executes in the same origin as the Smart Forms application, the attacker gains the capability to bypass Same-Origin Policy (SOP) protections. This allows the attacker to read and manipulate sensitive data displayed on the page, intercept sensitive tokens, and perform actions on behalf of the authenticated user. In environments where administrative sessions are active, this vulnerability may lead to full administrative account takeover through session token theft."
}