{"id":"CVE-2026-111654","kind":"vulnerability","aliases":["CVE-2026-111654"],"related":[],"title":"FastBee: authenticated users can read and change other users' device groups","description":"FastBee through 2.1.0 contains an insecure direct object reference vulnerability that allows authenticated low-privilege users to access other users' device groups because GroupController queries lack owner checks. Attackers, including self-registered users, can supply sequential group IDs to read, overwrite, reassign, rewrite device associations of, or delete other users' groups.","summary":"FastBee through 2.1.0 has a missing ownership check in GroupController, so any logged-in user can supply another user's sequential group ID. An attacker can then read, overwrite, reassign, or delete that user's device groups.","severity":"medium","cvss":6.3,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["fastbee","iot","package","self-hosted"],"not_affected_if":["auth-required","single-user-instance"],"how_to_check":"- Check the installed FastBee version; the sources say versions through `2.1.0` are affected.\n- Review the GroupController group read, update and delete endpoints for an owner or tenant check on the group ID.","fix":null,"status":"open","published_at":"2026-10-16T18:17:46+00:00","first_seen_at":"2026-10-23T21:57:13+00:00","triaged_at":"2026-10-25T04:01:54+00:00","updated_at":"2026-10-25T04:01:54+00:00","category":"package","confidence":0.6,"triage":{"at":"2026-10-25T04:01:54Z","model":"claude-haiku-5-5","output":{"fix":"unknown","reach":"network","title":"FastBee: authenticated users can read and change other users' device groups","impact":"medium","summary":"FastBee through 2.1.0 has a missing ownership check in GroupController, so any logged-in user can supply another user's sequential group ID. An attacker can then read, overwrite, reassign, or delete that user's device groups.","category":"package","nicknames":[],"who_cares":["fastbee","self-hosted","iot"],"confidence":0.6,"needs_auth":"yes","worst_case":"other users' device groups read, altered or deleted by any account","analyst_note":"Find the fixed FastBee release and the upstream commit adding owner checks to GroupController, via the NVD entry https://nvd.nist.gov/vuln/detail/CVE-2026-111654.","how_to_check":"- Check the installed FastBee version; the sources say versions through `2.1.0` are affected.\n- Review the GroupController group read, update and delete endpoints for an owner or tenant check on the group ID.","needs_analyst":true,"not_affected_if":["single-user-instance","auth-required"],"who_is_affected":"Teams that run FastBee 2.1.0 or earlier with self-registration or multiple user accounts sharing one instance are exposed, because any authenticated user can reach other users' groups by ID. Single-user deployments with no other accounts have little to lose from this flaw.","user_interaction":"no","needs_special_setup":"unknown","severity_if_unknown":"medium"},"cost_usd":0.000591,"input_tokens":3331,"output_tokens":516,"severity_before":"medium"},"analyst_status":null,"analyst_note":null,"search":"'-111654':14A,17A '-2026':13A,16A '2.1.0':26B,64C 'access':80C 'allow':73C 'anoth':42B 'associ':108C 'attack':49B,91C 'authent':2A,74C 'chang':7A 'check':31B,90C 'contain':65C 'cve':12A,15A 'delet':56B,111C 'devic':10A,60B,83C,107C 'direct':68C 'fastbe':1A,18B,24B,62C 'group':11A,46B,61B,84C,100C,114C 'groupcontrol':33B,86C 'host':23B 'id':47B,101C 'includ':92C 'insecur':67C 'iot':19B 'lack':88C 'log':37B 'logged-in':36B 'low':76C 'low-privileg':75C 'miss':29B 'object':69C 'overwrit':53B,104C 'owner':89C 'ownership':30B 'packag':20B 'privileg':77C 'queri':87C 'read':5A,52B,103C 'reassign':54B,105C 'refer':70C 'regist':95C 'rewrit':106C 'self':22B,94C 'self-host':21B 'self-regist':93C 'sequenti':45B,99C 'suppli':41B,98C 'user':3A,9A,39B,43B,58B,78C,82C,96C,113C 'vulner':71C","nicknames":[],"mitigations":[],"who_affected":"Teams that run FastBee 2.1.0 or earlier with self-registration or multiple user accounts sharing one instance are exposed, because any authenticated user can reach other users' groups by ID. Single-user deployments with no other accounts have little to lose from this flaw.","tier":"C","verified":{},"analyst_revisit_at":null,"first_public_at":"2026-10-16T18:17:46+00:00","kev":null,"cvss_vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/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","cvss_by":"disclosure@vulncheck.com","poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-111654","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-111654","severity":null,"published_at":"2026-10-16T18:17:46+00:00","modified_at":"2026-10-21T21:17:53+00:00","first_seen_at":"2026-10-23T21:57:13+00:00","fetched_at":"2026-10-23T22:28:55+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"}