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.
References6
- github.com/kerwincui/FastBee/blob/v2.1.0/springboot/fastbee-ope…
- github.com/kerwincui/FastBee/blob/v2.1.0/springboot/fastbee-ser…
- github.com/kerwincui/FastBee/blob/v2.1.0/springboot/fastbee-ser…
- hackmd.io/@hieuPenguinnn/fastbee-device-group-cross-user-idor
- www.vulncheck.com/advisories/fastbee-through-2.1.0-idor-via-iot…
- hackmd.io/@hieuPenguinnn/fastbee-device-group-cross-user-idor
Metrics
- CVSS 3.1
-
6.3
MEDIUM
Score source: CNA
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L - CVSS 4.0
-
5.3
MEDIUM
Score source: CNA
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 - EPSS — exploit probability
- 0% percentile: 24 · as of 10 November 2026
- CWE
- CWE-639
Could this be exploited in your environment?
A patch closes the known hole. A penetration test shows what an attacker can still reach — with proof.