CVE-2026-58660: Kanboard BoardAjaxController Missing Ownership Check via Drag-and-Drop

Severity: high (CVSS 8.1 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.5% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-07-15 · updated 2026-10-29
Weakness: CWE-639

Description

Kanboard before 1.2.53, fixed in commit 564cc30, BoardAjaxController save() method (used by the kanban board drag-and-drop endpoint) validates the caller's role on the attacker-supplied project_id but never verifies that the supplied task_id actually belongs to that project. Because task identifiers are sequential integers shared across the entire instance, any authenticated user who is a member of at least one project can enumerate and move (corrupt/hide) tasks belonging to any other project on the same instance, including private projects they have no membership or role on.

Affected products

kanboard: before 1.2.53 — fixed in 1.2.53

How to fix

Upgrade to a fixed version: kanboard 1.2.53. Check the vendor advisory for mitigations.

References

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