Vulnerability · Published Nov 3, 2026 · Assigned by VulnCheck

CVE-2026-121556FastBee through 2.1.0 IDOR via /iot/product By-ID Endpoints

High 8.3

In plain English

A high-severity authorization bypass via user-controlled key in FastBee from beecue. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 39% of all known vulnerabilities).

Severity (CVSS 3.1)8.3High

Exploit odds (30 days)0.4%top 61.2% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official 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.

Affected products (as reported)

Vendor	Product	Versions
beecue	FastBee	0 – through 2.1.0

Weakness: CWE-639 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:L

References

GitHub Issue #32 issue-tracking
https://github.com/kerwincui/FastBee product
Fix commit patch
https://github.com/kerwincui/FastBee/blob/v2.1.0/springboot/fastbee-open-api/src/main/java/com/fastbee/data/controller/ProductController.java#L77-L141 technical-description
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 technical-description
https://github.com/kerwincui/FastBee/blob/v2.1.0/springboot/fastbee-service/fastbee-iot-service/src/main/resources/mapper/iot/ProductMapper.xml#L37-L67 technical-description
VulnCheck Advisory: FastBee through 2.1.0 IDOR via /iot/product By-ID Endpoints third-party-advisory