EUVD-2026-10062

Comprehensive Technical Analysis of EUVD-2026-10062

1. Vulnerability Assessment and Severity Evaluation

The vulnerability described in EUVD-2026-10062 pertains to an Insecure Direct Object Reference (IDOR) issue in Wekan, an open-source kanban tool built with Meteor. This vulnerability allows unauthorized users to modify custom fields across different boards, leading to potential unauthorized data manipulation. The severity of this vulnerability is rated as critical, with a CVSS base score of 9.3. This high score is due to the ease of exploitation (low complexity) and the significant impact on confidentiality, integrity, and availability of data.

2. Potential Attack Vectors and Exploitation Methods

Attack Vectors:

• Unauthorized Data Modification: An attacker with access to any board can modify custom fields on any other board by supplying a foreign custom field ID.
• Data Exfiltration: The required custom field IDs can be obtained by exporting a board, which only needs read access. The exported JSON includes the IDs of all board components.

Exploitation Methods:

• Direct Object Reference Manipulation: By crafting requests to the PUT /api/boards/:boardId/custom-fields/:customFieldId endpoint, an attacker can modify custom fields on boards they do not own.
• Cross-Board Manipulation: The same flaw exists in the POST, PUT, and DELETE endpoints for dropdown items under custom fields, allowing for broader manipulation.

3. Affected Systems and Software Versions

Affected Versions:

• Wekan versions 8.32 and 8.33

Fixed Version:

• The issue has been resolved in Wekan version 8.34.

4. Recommended Mitigation Strategies

Immediate Actions:

• Upgrade to the Latest Version: Upgrade Wekan to version 8.34 or later to mitigate the vulnerability.
• Access Controls: Implement strict access controls and regularly review user permissions to minimize the risk of unauthorized access.

Long-Term Strategies:

• Regular Security Audits: Conduct regular security audits and code reviews to identify and fix similar vulnerabilities.
• Input Validation: Ensure that all input is validated and that authorization checks are performed against the correct resources.
• Monitoring and Logging: Implement robust monitoring and logging to detect and respond to any suspicious activities.

5. Impact on European Cybersecurity Landscape

The vulnerability in Wekan poses a significant risk to organizations using this tool, particularly those in the European Union. Unauthorized data manipulation can lead to data breaches, loss of sensitive information, and disruption of business operations. Given the critical nature of the vulnerability, it underscores the importance of timely patch management and regular security assessments to protect against such threats.

6. Technical Details for Security Professionals

Vulnerability Details:

• Endpoint Vulnerability: The PUT /api/boards/:boardId/custom-fields/:customFieldId endpoint validates the authenticated user's access to the specified boardId but fails to confirm that the custom field actually belongs to that board during the database update.
• Authorization Check: The authorization check is performed against the wrong resource, allowing cross-board custom field manipulation.
• Data Export: The custom field IDs can be obtained by exporting a board, which includes the IDs of all board components in the exported JSON.

Exploitation Steps:

1. Obtain Custom Field IDs: Export a board to obtain the custom field IDs.
2. Craft Malicious Requests: Use the obtained IDs to craft requests to the vulnerable endpoints (PUT, POST, DELETE) to modify custom fields on other boards.
3. Execute Requests: Send the crafted requests to the Wekan server to perform unauthorized modifications.

Mitigation Steps:

1. Update Wekan: Ensure all instances of Wekan are updated to version 8.34 or later.
2. Review Code: Conduct a thorough code review to identify and fix similar IDOR issues.
3. Implement Strict Access Controls: Ensure that access controls are strictly enforced and regularly reviewed.
4. Monitor and Log: Implement monitoring and logging to detect and respond to any suspicious activities.

By addressing this vulnerability promptly and implementing robust security measures, organizations can significantly reduce the risk of unauthorized data manipulation and ensure the integrity and confidentiality of their data.