{"id":"CVE-2026-121556","kind":"vulnerability","aliases":["CVE-2026-121556"],"related":[],"title":"FastBee: IDOR in ProductController lets tenants read and edit other tenants' products","description":"FastBee through 2.1.0 contains an insecure direct object reference vulnerability in ProductController that allows authenticated tenant users to access other tenants' products by supplying their product IDs. Attackers can enumerate sequential product IDs to read MQTT account, password, and secret values, overwrite product configuration including tenant_id, or delete products with cascading rows.","summary":"FastBee, an IoT platform, has an insecure direct object reference in its ProductController, so an authenticated user can access products belonging to other tenants by supplying their product IDs. An attacker can enumerate sequential IDs to read MQTT account credentials and secrets, change product configuration, or delete products.","severity":"high","cvss":8.7,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["fastbee","iot","mqtt","multi-tenant","other"],"not_affected_if":["no-untrusted-accounts","single-tenant"],"how_to_check":"- Check the installed FastBee version; the sources say the flaw affects versions through `2.1.0`.\n- Review whether tenant users can call the product endpoints with IDs outside their own tenant.","fix":"- Patch referenced in the sources (github.com); the fixed version is not stated in the sources.","status":"open","published_at":"2026-11-03T16:17:27+00:00","first_seen_at":"2026-11-03T16:21:44+00:00","triaged_at":"2026-11-03T16:23:37+00:00","updated_at":"2026-11-03T16:23:37+00:00","category":"other","confidence":0.6,"triage":{"at":"2026-11-03T16:23:37Z","model":"claude-haiku-5-5","output":{"fix":"- Patch referenced in the sources (github.com); the fixed version is not stated in the sources.\n- unknown","reach":"network","title":"FastBee: IDOR in ProductController lets tenants read and edit other tenants' products","impact":"high","summary":"FastBee, an IoT platform, has an insecure direct object reference in its ProductController, so an authenticated user can access products belonging to other tenants by supplying their product IDs. An attacker can enumerate sequential IDs to read MQTT account credentials and secrets, change product configuration, or delete products.","audience":"businesses","category":"other","nicknames":[],"who_cares":["fastbee","iot","mqtt","multi-tenant"],"confidence":0.6,"fix_status":"unknown","needs_auth":"yes","worst_case":"attacker reads MQTT credentials and secrets, edits or deletes other tenants' products","analyst_note":"Confirm the fixed version from the linked GitHub patch and check the VulnCheck advisory for the affected version range.","how_to_check":"- Check the installed FastBee version; the sources say the flaw affects versions through `2.1.0`.\n- Review whether tenant users can call the product endpoints with IDs outside their own tenant.\n- unknown","plain_action":"","needs_analyst":true,"not_affected_if":["single-tenant","no-untrusted-accounts"],"who_is_affected":"FastBee deployments with multiple tenants where users hold authenticated accounts. Single-tenant installations with no untrusted accounts are less exposed. The sources do not say which configurations are default.","user_interaction":"no","needs_special_setup":"unknown","severity_if_unknown":"unknown"},"cost_usd":0.000709,"input_tokens":4177,"output_tokens":582,"severity_before":"high"},"analyst_status":null,"analyst_note":null,"search":"'-121556':15A,18A '-2026':14A,17A '2.1.0':75C 'access':43B,91C 'account':63B,109C 'allow':86C 'attack':55B,100C 'authent':40B,87C 'belong':45B 'cascad':124C 'chang':67B 'configur':69B,116C 'contain':76C 'credenti':64B 'cve':13A,16A 'delet':71B,121C 'direct':32B,79C 'edit':9A 'enumer':57B,102C 'fastbe':1A,19B,25B,73C 'id':53B,59B,99C,105C,119C 'idor':2A 'includ':117C 'insecur':31B,78C 'iot':20B,27B 'let':5A 'mqtt':21B,62B,108C 'multi':23B 'multi-ten':22B 'object':33B,80C 'overwrit':114C 'password':110C 'platform':28B 'product':12A,44B,52B,68B,72B,94C,98C,104C,115C,122C 'productcontrol':4A,37B,84C 'read':7A,61B,107C 'refer':34B,81C 'row':125C 'secret':66B,112C 'sequenti':58B,103C 'suppli':50B,96C 'tenant':6A,11A,24B,48B,88C,93C,118C 'user':41B,89C 'valu':113C 'vulner':82C","nicknames":[],"mitigations":[],"who_affected":"FastBee deployments with multiple tenants where users hold authenticated accounts. Single-tenant installations with no untrusted accounts are less exposed. The sources do not say which configurations are default.","tier":"B","verified":{},"analyst_revisit_at":null,"fix_status":"unknown","audience":"businesses","plain_action":null,"pkeys":[],"ptokens":[],"labels":["fastbee","high","iot","mqtt","multitenant","other"],"campaign_type":null,"first_public_at":"2026-11-03T16:17:27+00:00","kev":null,"cvss_vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/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-2026-121556","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-121556","severity":null,"published_at":"2026-11-03T16:17:27+00:00","modified_at":"2026-11-03T16:17:28+00:00","first_seen_at":"2026-11-03T16:21:44+00:00","fetched_at":"2026-11-03T16:21:44+00:00","note":null}],"documents":[{"id":58847,"url":"https://github.com/beecue/FastBee/commit/3393e3223965a9dc9682dfb2bd37635fffa0fbd2","title":"Patch: github.com","kind":"other","source":"nvd","publisher":"vendor","text":null,"published_at":null,"relation":"fix","confidence":null,"note":"Patch: github.com"},{"id":58848,"url":"https://www.vulncheck.com/advisories/fastbee-through-2.1.0-idor-via-iot-product-by-id-endpoints","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"}],"notice":"Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai"}