CVE-2025-67718: 
JavaScript vulnerability analysis and mitigation

CVE-2025-67718 is an authorization bypass vulnerability in Form.io (formio), a Form and Data Management Platform for Progressive Web Applications, caused by improper handling of case sensitivity in URL path parameters. A flaw in path handling allows unauthenticated or unauthorized attackers to access protected API endpoints by sending a specially crafted request path, potentially resulting in unauthorized data disclosure. Affected versions include formio < 3.5.7 and >= 4.0.0-rc.1, < 4.4.3 (npm package), as well as formio-server < 8.5.8 and < 9.4.2. The vulnerability was discovered on 2025-05-22, fixed on 2025-05-30, and publicly disclosed in December 2025. It carries a CVSS v4 base score of 8.7 (High) (GitHub Advisory, formio Advisory).

The root cause is classified as CWE-178 (Improper Handling of Case Sensitivity) and CWE-200 (Exposure of Sensitive Information to an Unauthorized Actor). Specifically, the getUrlParams utility function in src/util/util.js stored URL parameter keys without normalizing their case, meaning that access control checks comparing parameter names in a case-sensitive manner could be bypassed by submitting parameter keys in a different case (e.g., uppercase instead of lowercase). The fix, applied in commits 1665b7c and 1836bdd, normalizes all URL parameter keys to lowercase using .toLowerCase() before storing them, ensuring consistent case handling during authorization checks. No authentication or user interaction is required to exploit this vulnerability over the network (GitHub Advisory, Patch Commit).

Successful exploitation allows an unauthenticated or unauthorized attacker to retrieve sensitive data from API endpoints that should be access-controlled, resulting in a high confidentiality impact. There is no integrity or availability impact — the vulnerability is limited to unauthorized data disclosure. Depending on the data managed by the affected Form.io instance (which may include form submissions, user data, or application configuration), the exposure could be significant in affected configurations (GitHub Advisory, Feedly).

There is no public proof-of-concept exploit code and no evidence of active in-the-wild exploitation at this time (Feedly). The vulnerability requires no authentication, no user interaction, and no special preconditions beyond network access to a vulnerable Form.io instance, making it straightforward to exploit if a PoC were developed. The EPSS score is approximately 0.066% (21st percentile), indicating a currently low probability of exploitation in the near term (GitHub Advisory). The vulnerability is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.

1. Reconnaissance: Identify internet-facing Form.io instances running vulnerable versions (formio < 3.5.7 or >= 4.0.0-rc.1, < 4.4.3) using tools like Shodan or Censys, or by inspecting npm package versions in exposed application metadata.
2. Identify protected endpoints: Enumerate API endpoints that are expected to require authentication or specific permissions, such as form submission data endpoints or administrative API routes.
3. Craft case-manipulated request: Send an HTTP request to a protected API endpoint with URL parameters whose keys use non-standard casing (e.g., uppercase or mixed-case variants of expected parameter names such as Token instead of token, or X-Token instead of x-token).
4. Bypass authorization check: Because the vulnerable getUrlParams function stores parameter keys without lowercasing them, the authorization logic fails to match the crafted parameter against its expected lowercase form, causing the access control check to be bypassed.
5. Retrieve protected data: The server responds with data from the protected endpoint as if the request were authorized, exposing sensitive form submissions or other protected resources (GitHub Advisory, Patch Commit).

• Network: Unusual HTTP GET/POST requests to protected Form.io API endpoints (e.g., /form, /submission, /role) from unauthenticated sources; requests containing URL parameters with mixed-case or uppercase key names (e.g., ?Token=, ?X-Token=) that deviate from normal lowercase conventions.
• Logs: Web server or application access logs showing repeated requests to sensitive API endpoints from the same IP without valid authentication tokens; HTTP 200 responses to requests that should have returned 401 or 403 errors.
• Application Logs: Form.io application logs showing successful data retrieval from protected endpoints without corresponding valid session or authentication records.

Upgrade the formio npm package to version 3.5.7 or later (for the 3.x branch) or 4.4.3 or later (for the 4.x branch). For formio-server, upgrade to 8.5.8 or 9.4.3 respectively. No configuration-based workaround is officially provided; upgrading is the recommended and only confirmed remediation. If immediate patching is not possible, consider placing the Form.io API behind an additional authentication layer or WAF rule that enforces case-normalized parameter validation (GitHub Advisory, formio Advisory).

The vulnerability was published by the formio maintainer (travist) via GitHub Security Advisories on December 10, 2025, and subsequently picked up by standard vulnerability tracking feeds including NVD, Red Hat CVE database, VulnDB, and INCIBE. No notable independent researcher commentary, media coverage, or significant social media discussion beyond automated CVE tracking posts has been observed for this vulnerability.