EUVD-2026-8646

Comprehensive Technical Analysis of EUVD-2026-8646

1. Vulnerability Assessment and Severity Evaluation

Vulnerability Description: The vulnerability in Budibase, identified as EUVD-2026-8646 (CVE-2026-27702), involves a Remote Code Execution (RCE) flaw due to the unsafe use of the eval() function within the View Filter Map Function in Budibase Cloud. This allows an attacker to execute arbitrary code on the server, leading to severe security implications.

Severity Evaluation: The CVSS (Common Vulnerability Scoring System) base score of 9.9 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:L breaks down as follows:

• AV:N - Attack Vector: Network, meaning the vulnerability is exploitable over the network.
• AC:L - Attack Complexity: Low, indicating that the attack is relatively straightforward to execute.
• PR:L - Privileges Required: Low, suggesting that minimal privileges are needed to exploit the vulnerability.
• UI:N - User Interaction: None, meaning no user interaction is required for the attack to succeed.
• S:C - Scope: Changed, indicating that the vulnerability affects a different security scope.
• C:H - Confidentiality: High, showing that the vulnerability can lead to a significant breach of confidentiality.
• I:H - Integrity: High, indicating that the integrity of the system can be severely compromised.
• A:L - Availability: Low, suggesting that the availability of the system may be slightly affected.

2. Potential Attack Vectors and Exploitation Methods

Attack Vectors:

• Network-Based Attacks: Given the AV:N vector, attackers can exploit this vulnerability over the network, making it accessible to a wide range of potential attackers.
• Low Privilege Requirements: The PR:L vector indicates that even users with minimal privileges can exploit this vulnerability, increasing the risk.

Exploitation Methods:

• Arbitrary Code Execution: By injecting malicious code into the View Filter Map Function, attackers can execute arbitrary commands on the server.
• Data Exfiltration: Attackers can extract sensitive data from the server.
• System Compromise: The ability to execute arbitrary code can lead to full system compromise, including installing malware, creating backdoors, and modifying system configurations.

3. Affected Systems and Software Versions

Affected Systems:

• Budibase Cloud versions prior to 3.30.4.

Software Versions:

• All versions of Budibase Cloud below 3.30.4 are vulnerable.

4. Recommended Mitigation Strategies

Immediate Actions:

• Update Software: Upgrade to Budibase Cloud version 3.30.4 or later, which includes the security patch for this vulnerability.
• Disable Unsafe Functions: If an immediate update is not possible, consider disabling or restricting the use of the eval() function in the View Filter Map Function.

Long-Term Strategies:

• Regular Patch Management: Implement a robust patch management process to ensure timely updates and patches.
• Code Review: Conduct thorough code reviews to identify and mitigate the use of unsafe functions like eval().
• Security Training: Provide security training for developers to avoid common vulnerabilities and promote secure coding practices.

5. Impact on European Cybersecurity Landscape

Regulatory Compliance:

• Organizations using Budibase Cloud must ensure compliance with regulations such as GDPR, which mandates the protection of personal data.
• Failure to address this vulnerability could result in data breaches, leading to regulatory fines and legal consequences.

Cybersecurity Posture:

• The critical nature of this vulnerability underscores the importance of proactive cybersecurity measures.
• European organizations must prioritize vulnerability management and incident response to mitigate such risks effectively.

6. Technical Details for Security Professionals

Vulnerability Details:

• The vulnerability arises from the unsafe use of the eval() function, which allows the execution of arbitrary code.
• The View Filter Map Function in Budibase Cloud processes user input without proper sanitization, leading to RCE.

Detection and Monitoring:

• Log Analysis: Monitor server logs for unusual activities, such as unexpected command executions or data exfiltration attempts.
• Intrusion Detection Systems (IDS): Deploy IDS to detect and alert on suspicious network activities.
• Code Audits: Regularly audit the codebase for unsafe functions and ensure proper input validation and sanitization.

References:

• GitHub Security Advisory
• GitHub Pull Request
• GitHub Commit
• Budibase Release 3.30.4
• NVD Detail

By addressing this vulnerability promptly and implementing robust security measures, organizations can significantly reduce the risk of exploitation and maintain a strong cybersecurity posture.