EUVD-2026-10358

Comprehensive Technical Analysis of EUVD-2026-10358

1. Vulnerability Assessment and Severity Evaluation

The vulnerability described in EUVD-2026-10358 affects Budibase, a low-code platform used for creating internal tools, workflows, and admin panels. The issue lies in the authorized() middleware, which is responsible for protecting server-side API endpoints. The vulnerability allows an unauthenticated, remote attacker to bypass authentication, authorization, role checks, and CSRF protection by appending a webhook path pattern to the query string of any request.

Severity Evaluation:

• CVSS Base Score: 9.1
• CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

The high base score indicates a critical vulnerability due to the ease of exploitation (low complexity) and the significant impact on confidentiality and integrity. The attack vector is network-based, requiring no privileges or user interaction, and affects the entire system.

2. Potential Attack Vectors and Exploitation Methods

Attack Vectors:

• Unauthenticated Access: An attacker can access any server-side API endpoint without authentication by appending a webhook path pattern (e.g., ?/webhooks/trigger) to the URL.
• Bypassing Authorization: The vulnerability allows bypassing role checks and CSRF protection, enabling unauthorized actions.

Exploitation Methods:

• Data Exfiltration: Attackers can retrieve sensitive information from the server.
• Unauthorized Actions: Attackers can perform actions that should be restricted to authorized users, such as modifying data or triggering workflows.
• CSRF Attacks: The lack of CSRF protection can be exploited to perform actions on behalf of authenticated users.

3. Affected Systems and Software Versions

Affected Software:

• Budibase versions 3.31.4 and earlier.

Affected Systems:

• Any system running the affected versions of Budibase, including internal tools, workflows, and admin panels.

4. Recommended Mitigation Strategies

Immediate Actions:

• Upgrade: Upgrade to a patched version of Budibase that addresses this vulnerability.
• Temporary Workaround: Implement a web application firewall (WAF) rule to block requests containing webhook path patterns in the query string.

Long-Term Mitigation:

• Code Review: Conduct a thorough code review to identify and fix similar issues in other parts of the application.
• Regular Updates: Ensure that all software components are regularly updated to the latest versions.
• Security Training: Provide security training for developers to avoid common vulnerabilities like unanchored regex patterns.

5. Impact on European Cybersecurity Landscape

The vulnerability in Budibase poses a significant risk to organizations using the platform, particularly those in the European Union. The potential for unauthenticated access to sensitive data and unauthorized actions can lead to data breaches, financial loss, and reputational damage. Given the critical nature of the vulnerability, it underscores the importance of robust security practices and timely patch management in the European cybersecurity landscape.

6. Technical Details for Security Professionals

Vulnerability Details:

• The isWebhookEndpoint() function uses an unanchored regex to match against ctx.request.url, which includes the full URL with query parameters.
• When the regex matches, the authorized() middleware calls return next(), bypassing all authentication, authorization, role checks, and CSRF protection.

Exploitation Example:

GET /api/sensitive-data?/webhooks/trigger

This request would bypass the authorized() middleware, allowing unauthenticated access to the /api/sensitive-data endpoint.

Mitigation Code Example:

// Example of a fixed isWebhookEndpoint function
function isWebhookEndpoint(ctx) {
  const url = ctx.request.url;
  const regex = /^\/webhooks\//;
  return regex.test(url);
}

This example ensures that the regex is anchored to the start of the URL, preventing the bypass through query parameters.

Conclusion: The vulnerability in Budibase highlights the importance of secure coding practices and regular security audits. Organizations should prioritize patching affected systems and implementing robust security measures to mitigate similar risks in the future.