Auth bypass in Kerwincui Fastbee
CVE-2026-111654
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.
Vulnerability class: IDOR (Insecure Direct Object Reference)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
- hackmd.io/@hieuPenguinnn/fastbee-device-group-cross-user-idor (third-party-advisory)
- github.com/kerwincui/FastBee/blob/v2.1.0/springboot/fastbee-open-api/src/main/j… (technical-description)
- github.com/kerwincui/FastBee/blob/v2.1.0/springboot/fastbee-service/fastbee-iot… (technical-description)
- github.com/kerwincui/FastBee/blob/v2.1.0/springboot/fastbee-service/fastbee-iot… (technical-description)
- www.vulncheck.com/advisories/fastbee-through-2.1.0-idor-via-iot-group-by-id-end… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-111654?
- CVE-2026-111654 is a medium-severity vulnerability in Kerwincui Fastbee, classified under Authorization Bypass Through User-Controlled Key. CVSS score: 6.3/10. Published 2026-10-16.
- How severe is CVE-2026-111654?
- Medium severity. CVSS v3 base score is 6.3 out of 10.