{"schemaVersion":3,"id":"CVE-2026-111918","aliases":["GHSA-fprf-r6rv-xg99","GO-2026-6731"],"status":"published","duplicateOf":null,"title":null,"description":"Vikunja from 1.0.0-rc0 before 2.7.0 contains an improper authorization vulnerability in RecalculateTaskPositions that allows authenticated users with zero accessible projects to write task_positions rows for all tasks instance-wide. Attackers can delete their Inbox after repointing default_project_id, then create empty-filter saved filters to persist cross-tenant references and amplify writes for denial of service.","dates":{"published":"2026-10-17T18:46:33.245Z","modified":"2026-10-19T16:39:37.953Z","reserved":null,"kevAdded":[],"kevDue":[]},"cvss":{"headline":{"score":5.4,"severity":"medium","version":"3.1","versionLabel":"v3.1","source":"CVE.org","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L","computed":false,"selection":"backend-summary"},"metrics":[{"version":"4.0","versionLabel":"v4.0","source":"CVE.org","score":5.3,"severity":"medium","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N","exploitability":null,"impact":null,"computed":false},{"version":"3.1","versionLabel":"v3.1","source":"CVE.org","score":5.4,"severity":"medium","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L","exploitability":null,"impact":null,"computed":false},{"version":"4.0","versionLabel":"v4.0","source":"NVD","score":5.3,"severity":"medium","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","exploitability":null,"impact":null,"computed":false},{"version":"3.1","versionLabel":"v3.1","source":"NVD","score":5.4,"severity":"medium","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L","exploitability":null,"impact":null,"computed":false},{"version":"3.1","versionLabel":"v3.1","source":"OSV · Go","score":5.4,"severity":"medium","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L","exploitability":7.2,"impact":4.2,"computed":true}]},"epss":{"probability":0.00176,"percentile":0.06809,"severity":"low","asOf":"2026-10-21T00:00:00.000Z","change":{"pp":null,"baselineDate":null,"baselineScore":null},"history":[{"date":"2026-10-18T00:00:00.000Z","score":0.00176,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.00176,"percentile":null},{"date":"2026-10-20T00:00:00.000Z","score":0.00176,"percentile":null},{"date":"2026-10-21T00:00:00.000Z","score":0.00176,"percentile":0.06809}],"last30":[{"date":"2026-10-18T00:00:00.000Z","score":0.00176,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.00176,"percentile":null},{"date":"2026-10-20T00:00:00.000Z","score":0.00176,"percentile":null},{"date":"2026-10-21T00:00:00.000Z","score":0.00176,"percentile":0.06809}]},"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-863","name":"Incorrect Authorization","description":"The product performs an authorization check when an actor attempts to access a resource or perform an action, but it does not correctly perform the check.","type":"weakness","status":"Incomplete","abstraction":"Class","likelihoodOfExploit":"High","url":"https://cwe.mitre.org/data/definitions/863.html"}],"affected":[{"vendor":"go-vikunja","product":"vikunja","name":"vikunja","label":"vikunja","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"≥ 1.0.0-rc0, < 2.7.0","noFixRecorded":false,"fixedIn":null}],"versionsText":"≥ 1.0.0-rc0, < 2.7.0","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":"≥ 1.0.0-rc0, ≤ 2.6.0","noFixRecorded":false,"fixedIn":null},{"text":"All versions","noFixRecorded":true,"fixedIn":null}],"versionsText":"≥ 1.0.0-rc0, ≤ 2.6.0 | 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-fprf-r6rv-xg99","label":"github.com/go-vikunja/vikunja/security/advisories/GHSA-fprf-r6rv-xg99","hostname":"github.com","tags":["Vendor Advisory","WEB","Advisory"]},{"url":"https://www.vulncheck.com/advisories/vikunja-1.0.0-rc0-before-2.7.0-cross-tenant-task-position-writes-via-saved-filter-creation","label":"www.vulncheck.com/advisories/…","hostname":"www.vulncheck.com","tags":["Third Party Advisory"]},{"url":"https://github.com/go-vikunja/vikunja","label":"github.com/go-vikunja/vikunja","hostname":"github.com","tags":["PACKAGE"]}],"lineage":{"upstream":[],"downstream":[],"duplicates":[],"related":[]},"timeline":[{"kind":"published","date":"2026-10-17T18:46:33.245Z","label":"Published","detail":"Vulnerability first disclosed.","source":null},{"kind":"modified","date":"2026-10-19T16:39:37.953Z","label":"Last modified","detail":"Vulnerability information updated.","source":null}],"risk":{"score":22,"level":"low","profile":"Default","thresholds":{"critical":75,"high":50,"medium":25,"low":10}},"meta":{"dataAsOf":"2026-10-22T11:45:11.720Z","stale":false,"partial":false}}