{"schemaVersion":3,"id":"CVE-2026-55067","aliases":["GHSA-569v-q83c-3j3g","GO-2026-6307"],"status":"published","duplicateOf":null,"title":"Vikunja: Authenticated cross-tenant kanban-bucket relocation via `project_view_id` mass-assignment","description":"Vikunja is an open-source self-hosted task management platform. Prior to 2.4.0, POST /api/v1/projects/{project}/views/{view}/buckets/{bucket} allows the request body project_view_id value to be mass assigned by Bucket.Update in pkg/models/kanban.go. The permission check validates that the bucket currently belongs to the URL project and view but does not validate the body selected destination view, allowing any authenticated user to relocate an attacker-owned bucket into another tenant’s Kanban view. The injected bucket retains attacker-controlled content and ownership, enabling cross-tenant defacement. This issue is fixed in version 2.4.0.","dates":{"published":"2026-08-28T16:53:59.656Z","modified":"2026-08-28T19:55:24.677Z","reserved":null,"kevAdded":[],"kevDue":[]},"cvss":{"headline":{"score":5,"severity":"medium","version":"3.1","versionLabel":"v3.1","source":"CVE.org","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:L/A:N","computed":false,"selection":"backend-summary"},"metrics":[{"version":"3.1","versionLabel":"v3.1","source":"CVE.org","score":5,"severity":"medium","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:L/A:N","exploitability":null,"impact":null,"computed":false},{"version":"3.1","versionLabel":"v3.1","source":"OSV · Go","score":5,"severity":"medium","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:L/A:N","exploitability":7.9,"impact":2.3,"computed":true},{"version":"3.1","versionLabel":"v3.1","source":"NVD","score":5,"severity":"medium","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:L/A:N","exploitability":null,"impact":null,"computed":false}]},"epss":{"probability":0.00336,"percentile":0.2577,"severity":"low","asOf":"2026-10-22T00:00:00.000Z","change":{"pp":0.09000000000000002,"baselineDate":"2026-09-22T00:00:00.000Z","baselineScore":0.00246},"history":[{"date":"2026-09-14T00:00:00.000Z","score":0.00246,"percentile":null},{"date":"2026-09-15T00:00:00.000Z","score":0.00246,"percentile":null},{"date":"2026-09-16T00:00:00.000Z","score":0.00246,"percentile":null},{"date":"2026-09-17T00:00:00.000Z","score":0.00246,"percentile":null},{"date":"2026-09-18T00:00:00.000Z","score":0.00246,"percentile":null},{"date":"2026-09-19T00:00:00.000Z","score":0.00246,"percentile":null},{"date":"2026-09-20T00:00:00.000Z","score":0.00246,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.00246,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.00246,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.00246,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.00336,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.00336,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.00336,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.00336,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.00336,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.00336,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.00336,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.00336,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.00336,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.00336,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.00336,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.00336,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.00336,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.00336,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.00336,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.00336,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.00336,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.00336,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.00336,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.00336,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.00336,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.00336,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.00336,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.00336,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.00336,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.00336,"percentile":null},{"date":"2026-10-20T00:00:00.000Z","score":0.00336,"percentile":null},{"date":"2026-10-21T00:00:00.000Z","score":0.00336,"percentile":null},{"date":"2026-10-22T00:00:00.000Z","score":0.00336,"percentile":0.2577}],"last30":[{"date":"2026-09-22T00:00:00.000Z","score":0.00246,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.00246,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.00336,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.00336,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.00336,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.00336,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.00336,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.00336,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.00336,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.00336,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.00336,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.00336,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.00336,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.00336,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.00336,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.00336,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.00336,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.00336,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.00336,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.00336,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.00336,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.00336,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.00336,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.00336,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.00336,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.00336,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.00336,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.00336,"percentile":null},{"date":"2026-10-20T00:00:00.000Z","score":0.00336,"percentile":null},{"date":"2026-10-21T00:00:00.000Z","score":0.00336,"percentile":null},{"date":"2026-10-22T00:00:00.000Z","score":0.00336,"percentile":0.2577}]},"kev":{"state":"not-listed","entries":[],"listedCount":0,"totalCatalogs":3,"catalogs":[{"source":"cisa","label":"CISA","listed":false,"entry":null},{"source":"enisa","label":"ENISA","listed":false,"entry":null},{"source":"circl","label":"CIRCL","listed":false,"entry":null}]},"ransomware":{"state":"none-recorded","sources":[]},"exploits":[],"exploitCount":0,"weaknesses":[{"id":"CWE-639","name":"Authorization Bypass Through User-Controlled Key","description":"The system's authorization functionality does not prevent one user from gaining access to another user's data or record by modifying the key value identifying the data.","type":"weakness","status":"Incomplete","abstraction":"Base","likelihoodOfExploit":"High","url":"https://cwe.mitre.org/data/definitions/639.html"}],"affected":[{"vendor":"go-vikunja","product":"vikunja","name":"vikunja","label":"vikunja","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"< 2.4.0","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 2.4.0","eol":null,"hubHref":"/vendor/go-vikunja/vikunja"},{"vendor":"code.vikunja.io","product":"api","name":"code.vikunja.io/api","label":"api","ecosystem":"Go","cpePart":null,"purl":"pkg:golang/code.vikunja.io/api","purlType":"golang","versions":[{"text":"< 2.4.0","noFixRecorded":false,"fixedIn":null},{"text":"All versions","noFixRecorded":true,"fixedIn":null}],"versionsText":"< 2.4.0 | All versions (No fix recorded)","eol":null,"hubHref":null}],"affectedCount":2,"eol":{"hasEol":false,"count":0},"references":[{"url":"https://github.com/go-vikunja/vikunja/security/advisories/GHSA-569v-q83c-3j3g","label":"github.com/go-vikunja/vikunja/security/advisories/GHSA-569v-q83c-3j3g","hostname":"github.com","tags":["X Refsource CONFIRM","WEB","Advisory"]},{"url":"https://github.com/go-vikunja/vikunja/pull/3239","label":"github.com/go-vikunja/vikunja/pull/3239","hostname":"github.com","tags":["X Refsource MISC","WEB"]},{"url":"https://github.com/go-vikunja/vikunja/commit/b31d606b8879ebe98fbb2ac5d8b3066b86f59868","label":"github.com/go-vikunja/vikunja/commit/b31d606b8879ebe98fbb2ac5d8b3066b86f59868","hostname":"github.com","tags":["X Refsource MISC","WEB"]},{"url":"https://github.com/go-vikunja/vikunja/releases/tag/v2.4.0","label":"github.com/go-vikunja/vikunja/releases/tag/v2.4.0","hostname":"github.com","tags":["X Refsource MISC","WEB"]},{"url":"https://github.com/go-vikunja/vikunja","label":"github.com/go-vikunja/vikunja","hostname":"github.com","tags":["PACKAGE"]}],"lineage":{"upstream":[],"downstream":["OPENSUSE-SU-2026:21812-1","SUSE-SU-2026:23692-1","SUSE-SU-2026:23712-1"],"duplicates":[],"related":["OPENSUSE-SU-2026:21812-1","SUSE-SU-2026:23692-1","SUSE-SU-2026:23712-1"]},"timeline":[{"kind":"published","date":"2026-08-28T16:53:59.656Z","label":"Published","detail":"Vulnerability first disclosed.","source":null},{"kind":"modified","date":"2026-08-28T19:55:24.677Z","label":"Last modified","detail":"Vulnerability information updated.","source":null}],"risk":{"score":20,"level":"low","profile":"Default","thresholds":{"critical":75,"high":50,"medium":25,"low":10}},"meta":{"dataAsOf":"2026-10-22T18:00:34.432Z","stale":false,"partial":false}}