Mitigation Strategies

The immediate mitigation step is to upgrade Kanboard to version 1.2.50 or later, where this vulnerability is fixed by adding proper project-level authorization checks in the getSwimlane API method.

If upgrading immediately is not possible, restrict access to the Kanboard API to trusted users only and monitor API usage for suspicious calls to getSwimlane or similar endpoints.

Additionally, review and apply any available patches or security advisories provided by Kanboard related to this issue.

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Executive Summary

[{'type': 'paragraph', 'content': "CVE-2026-25530 is an authorization bypass vulnerability in Kanboard's getSwimlane API method. Prior to version 1.2.50, this method did not perform proper project-level authorization checks, allowing authenticated users to access swimlane data from projects they are not authorized to view."}, {'type': 'paragraph', 'content': 'Specifically, the getSwimlane method returned swimlane data by ID without verifying if the requesting user had access rights to the associated project. This flaw allowed unauthorized users to retrieve metadata such as swimlane name, description, and project ID from restricted projects.'}, {'type': 'paragraph', 'content': "The vulnerability was fixed by adding explicit authorization checks that verify user permissions against the swimlane's associated project before returning any data."}] [2]

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Impact Analysis

This vulnerability allows authenticated users with low privileges to access swimlane metadata from projects they do not have permission to view.

• Unauthorized disclosure of project swimlane information such as names and descriptions.
• Exposure of project existence confirmation through the revealed project IDs.

While the impact is limited to confidentiality (metadata exposure), it can lead to information leakage that might aid attackers in further reconnaissance or social engineering.

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Compliance Impact

I don't know

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Detection Guidance

[{'type': 'paragraph', 'content': 'This vulnerability can be detected by attempting to access swimlane data from projects for which the authenticated user does not have permission. Specifically, an authenticated user can call the getSwimlane API method with a swimlane ID belonging to a project they should not access and observe if the swimlane metadata is returned.'}, {'type': 'paragraph', 'content': 'A practical detection method is to use an HTTP client or API testing tool to send a request to the getSwimlane API endpoint with a swimlane ID from an unauthorized project and check if the response includes swimlane data instead of an authorization error.'}, {'type': 'paragraph', 'content': 'Example command using curl (replace placeholders with actual values):'}, {'type': 'list_item', 'content': 'curl -H "Authorization: Bearer <token>" https://<kanboard-server>/api/getSwimlane/<swimlane_id>'}, {'type': 'paragraph', 'content': 'If the response returns swimlane details for a project the user should not access, the system is vulnerable.'}] [2]

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