FastBee through 2.1.0 IDOR via /iot/product By-ID Endpoints

Advisories

FastBee through 2.1.0 IDOR via /iot/product By-ID Endpoints

Severity: high
Date: 11/3/2026
Affecting: FastBee <= 2.1.0
CVE: CVE-2026-121556
CWE: CWE-639 Authorization Bypass Through User-Controlled Key
CVSS: 8.7
CVSS V4 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
References: GitHub Issue #32
https://github.com/kerwincui/FastBee
Fix commit
https://github.com/kerwincui/FastBee/blob/v2.1.0/springboot/fastbee-open-api/src/main/java/com/fastbee/data/controller/ProductController.java#L77-L141
https://github.com/kerwincui/FastBee/blob/v2.1.0/springboot/fastbee-service/fastbee-iot-service/src/main/java/com/fastbee/iot/service/impl/ProductServiceImpl.java#L72-L92
https://github.com/kerwincui/FastBee/blob/v2.1.0/springboot/fastbee-service/fastbee-iot-service/src/main/resources/mapper/iot/ProductMapper.xml#L37-L67
Credit: hieuPenguinnn
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.

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