Auth bypass in Kanboard
CVE-2026-58660
Kanboard through 1.2.52, 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.
Vulnerability class: IDOR (Insecure Direct Object Reference)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.1 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H.
EPSS exploit prediction
EPSS: 0.005 (42.2th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 42nd percentile — 42.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.005 · newest: 0.005 · change: 0.000
Affected products
- Kanboard — versions 0, 564cc30e1e360959572e01e158734d9475c05903
Weakness classification (CWE)
References
- github.com/kanboard/kanboard/issues/5852 (technical-description, exploit)
- github.com/kanboard/kanboard/pull/5853 (issue-tracking)
- github.com/kanboard/kanboard/commit/564cc30e1e360959572e01e158734d9475c05903 (patch)
- www.vulncheck.com/advisories/kanboard-boardajaxcontroller-missing-ownership-che… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-58660?
- CVE-2026-58660 is a high-severity vulnerability in Kanboard, classified under Authorization Bypass Through User-Controlled Key. CVSS score: 8.1/10. Published 2026-07-15.
- How severe is CVE-2026-58660?
- High severity. CVSS v3 base score is 8.1 out of 10.