{"id":"CVE-2026-123494","kind":"vulnerability","aliases":["CVE-2026-123494"],"related":[],"title":"Vikunja: missing OAuth state check lets attackers import data into victim accounts","description":"Vikunja before 2.7.1 contains a cross-site request forgery vulnerability that allows attackers to import their data into a victim's account because the Todoist, Microsoft To Do, and Trello migration OAuth callbacks lack a bound state parameter. Attackers can authorize their own account, keep the unused callback code or token, and lure a logged-in victim to the migration callback route to auto-import attacker-chosen projects and tasks containing phishing links.","summary":"Vikunja's Todoist, Microsoft To Do and Trello migration OAuth callbacks do not bind a state parameter, so a logged-in user can be tricked into visiting a callback that imports attacker-chosen projects and tasks. The imported tasks can carry phishing links.","severity":"medium","cvss":5.1,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["package","self-hosted","todo-apps","vikunja"],"not_affected_if":["migration-unused","version-2.7.1-or-later"],"how_to_check":"- Check the Vikunja version in use; the sources say versions before `2.7.1` are affected.\n- Check whether the Todoist, Microsoft To Do or Trello migration feature is reachable on your instance.","fix":"- Vikunja: move to `2.7.1` or later.","status":"open","published_at":"2026-11-08T02:16:36+00:00","first_seen_at":"2026-11-08T02:21:07+00:00","triaged_at":"2026-11-08T02:25:29+00:00","updated_at":"2026-11-08T02:25:29+00:00","category":"package","confidence":0.6,"triage":{"at":"2026-11-08T02:25:29Z","model":"claude-haiku-5-5","output":{"fix":"- Vikunja: move to `2.7.1` or later.","reach":"internet","title":"Vikunja: missing OAuth state check lets attackers import data into victim accounts","impact":"low","summary":"Vikunja's Todoist, Microsoft To Do and Trello migration OAuth callbacks do not bind a state parameter, so a logged-in user can be tricked into visiting a callback that imports attacker-chosen projects and tasks. The imported tasks can carry phishing links.","audience":"businesses","category":"package","nicknames":[],"who_cares":["vikunja","self-hosted","todo-apps"],"confidence":0.6,"fix_status":"available","needs_auth":"unknown","worst_case":"attacker-chosen tasks with phishing links appear in victim accounts","analyst_note":"","how_to_check":"- Check the Vikunja version in use; the sources say versions before `2.7.1` are affected.\n- Check whether the Todoist, Microsoft To Do or Trello migration feature is reachable on your instance.","plain_action":"","needs_analyst":false,"not_affected_if":["version-2.7.1-or-later","migration-unused"],"who_is_affected":"Self-hosted or hosted Vikunja instances before 2.7.1 where users can reach the Todoist, Microsoft To Do or Trello migration callbacks. The attack needs a logged-in victim to open a crafted link; the sources do not say whether the migration feature can be disabled.","user_interaction":"yes","needs_special_setup":"unknown","severity_if_unknown":"unknown"},"cost_usd":0.000704,"input_tokens":4317,"output_tokens":544,"severity_before":"medium"},"analyst_status":null,"analyst_note":null,"search":"'-123494':15A,18A '-2026':14A,17A '2.7.1':74C 'account':12A,94C,116C 'allow':84C 'app':25B 'attack':7A,60B,85C,111C,141C 'attacker-chosen':59B,140C 'author':113C 'auto':138C 'auto-import':137C 'bind':40B 'bound':108C 'callback':37B,56B,105C,120C,134C 'carri':69B 'check':5A 'chosen':61B,142C 'code':121C 'contain':75C,146C 'cross':78C 'cross-sit':77C 'cve':13A,16A 'data':9A,89C 'forgeri':81C 'host':22B 'import':8A,58B,66B,87C,139C 'keep':117C 'lack':106C 'let':6A 'link':71B,148C 'log':47B,128C 'logged-in':46B,127C 'lure':125C 'microsoft':30B,98C 'migrat':35B,103C,133C 'miss':2A 'oauth':3A,36B,104C 'packag':19B 'paramet':43B,110C 'phish':70B,147C 'project':62B,143C 'request':80C 'rout':135C 'self':21B 'self-host':20B 'site':79C 'state':4A,42B,109C 'task':64B,67B,145C 'todo':24B 'todo-app':23B 'todoist':29B,97C 'token':123C 'trello':34B,102C 'trick':52B 'unus':119C 'user':49B 'victim':11A,92C,130C 'vikunja':1A,26B,27B,72C 'visit':54B 'vulner':82C","nicknames":[],"mitigations":[],"who_affected":"Self-hosted or hosted Vikunja instances before 2.7.1 where users can reach the Todoist, Microsoft To Do or Trello migration callbacks. The attack needs a logged-in victim to open a crafted link; the sources do not say whether the migration feature can be disabled.","tier":"C","verified":{},"analyst_revisit_at":null,"fix_status":"available","audience":"businesses","plain_action":null,"pkeys":[],"ptokens":[],"labels":["medium","package","selfhosted","todoapps","vikunja"],"campaign_type":null,"search_a":"'-123494':15A,18A '-2026':14A,17A 'account':12A 'attack':7A 'check':5A 'cve':13A,16A 'data':9A 'import':8A 'let':6A 'miss':2A 'oauth':3A 'state':4A 'victim':11A 'vikunja':1A","search_b":"'app':25B 'attack':60B 'attacker-chosen':59B 'bind':40B 'callback':37B,56B 'carri':69B 'chosen':61B 'host':22B 'import':58B,66B 'link':71B 'log':47B 'logged-in':46B 'microsoft':30B 'migrat':35B 'oauth':36B 'packag':19B 'paramet':43B 'phish':70B 'project':62B 'self':21B 'self-host':20B 'state':42B 'task':64B,67B 'todo':24B 'todo-app':23B 'todoist':29B 'trello':34B 'trick':52B 'user':49B 'vikunja':26B,27B 'visit':54B","search_c":"'2.7.1':74C 'account':94C,116C 'allow':84C 'attack':85C,111C,141C 'attacker-chosen':140C 'author':113C 'auto':138C 'auto-import':137C 'bound':108C 'callback':105C,120C,134C 'chosen':142C 'code':121C 'contain':75C,146C 'cross':78C 'cross-sit':77C 'data':89C 'forgeri':81C 'import':87C,139C 'keep':117C 'lack':106C 'link':148C 'log':128C 'logged-in':127C 'lure':125C 'microsoft':98C 'migrat':103C,133C 'oauth':104C 'paramet':110C 'phish':147C 'project':143C 'request':80C 'rout':135C 'site':79C 'state':109C 'task':145C 'todoist':97C 'token':123C 'trello':102C 'unus':119C 'victim':92C,130C 'vikunja':72C 'vulner':82C","first_public_at":"2026-10-22T10:00:04+00:00","kev":null,"cvss_vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:L/VA:N/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","cvss_by":"disclosure@vulncheck.com","poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-123494","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-123494","severity":null,"published_at":"2026-11-08T02:16:36+00:00","modified_at":"2026-11-08T02:16:36+00:00","first_seen_at":"2026-11-08T02:21:07+00:00","fetched_at":"2026-11-08T02:21:07+00:00","note":null}],"documents":[{"id":99137,"url":"https://github.com/go-vikunja/vikunja/security/advisories/GHSA-xgw3-ccqg-f6ww","title":"Vendor advisory: github.com","kind":"vendor","source":"nvd","publisher":"vendor","text":null,"published_at":"2026-10-22T10:00:04+00:00","relation":"advisory","confidence":null,"note":"Vendor advisory: github.com"},{"id":99138,"url":"https://www.vulncheck.com/advisories/vikunja-before-2.7.1-login-csrf-via-migration-oauth-callbacks","title":"Third-party advisory: www.vulncheck.com","kind":"advisory","source":"nvd","publisher":"research","text":null,"published_at":null,"relation":"advisory","confidence":null,"note":"Third-party advisory: www.vulncheck.com"}],"exploit_sources":[],"notice":"Free to read, with fair use of about 60 pages a minute. For higher limits or API access: sales@infrastack.ai"}