Vulnerability · Published Oct 16, 2026 · Assigned by VulnCheck

CVE-2026-111654FastBee through 2.1.0 IDOR via /iot/group By-ID Endpoints

Medium 6.3

In plain English

A medium-severity authorization bypass via user-controlled key in FastBee from kerwincui. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 24% of all known vulnerabilities).

Severity (CVSS 3.1)6.3Medium

Exploit odds (30 days)0.3%top 76.1% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official 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.

Affected products (as reported)

Vendor	Product	Versions
kerwincui	FastBee	0 – through 2.1.0

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

References

https://hackmd.io/@hieuPenguinnn/fastbee-device-group-cross-user-idor third-party-advisory
https://github.com/kerwincui/FastBee/blob/v2.1.0/springboot/fastbee-open-api/src/main/java/com/fastbee/data/controller/GroupController.java#L70-L137 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/GroupServiceImpl.java#L37-L143 technical-description
https://github.com/kerwincui/FastBee/blob/v2.1.0/springboot/fastbee-service/fastbee-iot-service/src/main/resources/mapper/iot/GroupMapper.xml#L36-L109 technical-description
VulnCheck Advisory: FastBee through 2.1.0 IDOR via /iot/group By-ID Endpoints third-party-advisory