{"id":"CVE-2026-107059","kind":"vulnerability","aliases":["CVE-2026-107059"],"related":[],"title":"Nextcloud: attacker can force logout and switch victims to attacker profile","description":"An issue in Nextcloud versionCode 30390190 allows attackers to force victim users to logout of their accounts and switch to an attacker controlled progile, bypassing authentication.","summary":"A flaw in Nextcloud versionCode 30390190 lets an attacker force a victim's account to log out and switch it to an attacker-controlled profile. The sources describe this as bypassing authentication.","severity":"unknown","cvss":null,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["nextcloud","runtime","self-hosted"],"not_affected_if":[],"how_to_check":"- Check the installed Nextcloud version in the admin overview or with `occ status`","fix":null,"status":"open","published_at":"2026-10-29T17:17:58+00:00","first_seen_at":"2026-10-29T17:26:17+00:00","triaged_at":"2026-10-29T17:28:00+00:00","updated_at":"2026-10-29T17:28:00+00:00","category":"runtime","confidence":0.35,"triage":{"at":"2026-10-29T17:28:00Z","model":"claude-haiku-5-5","output":{"fix":"unknown","reach":"unknown","title":"Nextcloud: attacker can force logout and switch victims to attacker profile","impact":"medium","summary":"A flaw in Nextcloud versionCode 30390190 lets an attacker force a victim's account to log out and switch it to an attacker-controlled profile. The sources describe this as bypassing authentication.","audience":"businesses","category":"runtime","nicknames":[],"who_cares":["nextcloud","self-hosted"],"confidence":0.35,"fix_status":"unknown","needs_auth":"unknown","worst_case":"attacker takes over a victim's session and account profile","analyst_note":"Find the NVD entry details and Nextcloud security advisory for the affected versions and fixed release.","how_to_check":"- Check the installed Nextcloud version in the admin overview or with `occ status`\n- unknown","plain_action":"","needs_analyst":true,"not_affected_if":[],"who_is_affected":"Teams that run a self-hosted Nextcloud instance on the affected build are exposed. The sources do not say which configurations or account types are needed, so unknown.","user_interaction":"unknown","needs_special_setup":"unknown","severity_if_unknown":"medium"},"cost_usd":0.000621,"input_tokens":4078,"output_tokens":426,"severity_before":"unknown"},"analyst_status":null,"analyst_note":null,"search":"'-107059':14A,17A '-2026':13A,16A '30390190':28B,61C 'account':36B,72C 'allow':62C 'attack':2A,10A,31B,46B,63C,77C 'attacker-control':45B 'authent':55B,81C 'bypass':54B,80C 'control':47B,78C 'cve':12A,15A 'describ':51B 'flaw':24B 'forc':4A,32B,65C 'host':22B 'issu':57C 'let':29B 'log':38B 'logout':5A,69C 'nextcloud':1A,18B,26B,59C 'profil':11A,48B 'progil':79C 'runtim':19B 'self':21B 'self-host':20B 'sourc':50B 'switch':7A,41B,74C 'user':67C 'versioncod':27B,60C 'victim':8A,34B,66C","nicknames":[],"mitigations":[],"who_affected":"Teams that run a self-hosted Nextcloud instance on the affected build are exposed. The sources do not say which configurations or account types are needed, so unknown.","tier":"C","verified":{},"analyst_revisit_at":null,"fix_status":"none","audience":"businesses","plain_action":null,"first_public_at":"2026-10-29T17:17:58+00:00","kev":null,"cvss_vector":null,"cvss_by":null,"poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-107059","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-107059","severity":null,"published_at":"2026-10-29T17:17:58+00:00","modified_at":"2026-10-29T17:17:58+00:00","first_seen_at":"2026-10-29T17:26:17+00:00","fetched_at":"2026-10-29T17:26:17+00:00","note":null}],"documents":[],"notice":"Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai"}