EUVD-2026-10357

Comprehensive Technical Analysis of EUVD-2026-10357

1. Vulnerability Assessment and Severity Evaluation

Vulnerability Description: The vulnerability in Budibase, a low-code platform for creating internal tools, involves a path traversal flaw in the PWA ZIP processing endpoint. This vulnerability allows an authenticated user with builder privileges to read arbitrary files from the server filesystem, including sensitive files like /proc/1/environ, which contains critical environment variables such as JWT secrets, database credentials, encryption keys, and API tokens.

Severity Evaluation: The Base Score of 9.6 (CVSS:3.1) indicates a critical vulnerability. The scoring vector CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N highlights the following:

• Attack Vector (AV:N): Network-based attack.
• Attack Complexity (AC:L): Low complexity.
• Privileges Required (PR:L): Low privileges (authenticated user with builder privileges).
• User Interaction (UI:N): No user interaction required.
• Scope (S:C): Change in scope.
• Confidentiality (C:H): High impact on confidentiality.
• Integrity (I:H): High impact on integrity.
• Availability (A:N): No impact on availability.

2. Potential Attack Vectors and Exploitation Methods

Attack Vectors:

• Authenticated User Exploitation: An attacker with builder privileges can upload a specially crafted ZIP file containing a malicious icons.json file.
• Path Traversal: The server processes the ZIP file and reads arbitrary files from the filesystem due to unsanitized path.join() usage.
• Data Exfiltration: The contents of sensitive files are uploaded to an object store (MinIO/S3) and can be retrieved via signed URLs.

Exploitation Methods:

• Crafting Malicious ZIP: The attacker crafts a ZIP file with a specially designed icons.json that includes path traversal sequences.
• Upload and Process: The attacker uploads the ZIP file to the /api/pwa/process-zip endpoint.
• Retrieve Sensitive Data: The attacker retrieves the uploaded sensitive data from the object store using signed URLs.

3. Affected Systems and Software Versions

Affected Systems:

• Budibase versions 3.31.5 and earlier.

Software Versions:

• All versions up to and including 3.31.5 are vulnerable.

4. Recommended Mitigation Strategies

Immediate Mitigation:

• Upgrade: Upgrade to a patched version of Budibase that addresses this vulnerability.
• Access Control: Restrict builder privileges to trusted users only.
• Monitoring: Implement monitoring for unusual access patterns to the /api/pwa/process-zip endpoint.

Long-Term Mitigation:

• Code Review: Conduct a thorough code review to identify and sanitize all user inputs, especially in file processing functions.
• Security Training: Provide security training for developers to prevent similar vulnerabilities in the future.
• Regular Audits: Conduct regular security audits and penetration testing.

5. Impact on European Cybersecurity Landscape

Impact Analysis:

• Data Breach: Potential for significant data breaches, including exposure of sensitive credentials and encryption keys.
• Compliance Risks: Violation of GDPR and other data protection regulations due to unauthorized access to personal data.
• Operational Disruption: Compromise of internal tools and workflows can lead to operational disruptions and financial losses.

Regulatory Implications:

• GDPR Compliance: Organizations must ensure compliance with GDPR by implementing robust security measures and reporting data breaches promptly.
• Cybersecurity Directives: Adherence to EU cybersecurity directives and guidelines to enhance overall security posture.

6. Technical Details for Security Professionals

Technical Analysis:

• Path Traversal Mechanism: The vulnerability arises from the use of path.join() with unsanitized user input, allowing an attacker to traverse directories and access sensitive files.
• Data Exfiltration Process: The server reads the contents of the specified files and uploads them to an object store, where they can be accessed via signed URLs.
• Sensitive Files: Key files like /proc/1/environ contain critical environment variables that can be exfiltrated in a single request.

Detection and Response:

• Log Analysis: Monitor logs for unusual file access patterns and ZIP file uploads.
• Intrusion Detection: Implement intrusion detection systems (IDS) to detect and alert on suspicious activities.
• Incident Response: Develop an incident response plan to quickly address and mitigate any detected exploitation attempts.

Conclusion: The path traversal vulnerability in Budibase is critical and requires immediate attention. Organizations using Budibase should prioritize upgrading to a patched version and implement robust security measures to prevent exploitation. The potential impact on data confidentiality and integrity underscores the need for vigilant cybersecurity practices in the European landscape.