Insecure direct object reference in FastBee exposes other tenants' products
Key facts
- Attack vector
- Network
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Attack requirements
- None
- Impact type
- Security bypass
- Confidentiality · integrity · availability
- High · High · Low
- Fix status
- No fix listed
Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-639.
Summary
FastBee through 2.1.0 contains an insecure direct object reference in ProductController that lets an authenticated tenant user access products belonging to other tenants by supplying their product IDs. An attacker with low privileges on the network can enumerate sequential product IDs to read MQTT account, password and secret values, overwrite product configuration including tenant_id, or delete products along with related rows. The weakness is classified as CWE-639.
Written with Claude Haiku 5.5 from the sources below · 2026-11-03
Description from the CNA
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.
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Total
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
Remediation
The sources list no fixed version for FastBee.
Written with Claude Haiku 5.5 from the sources below · 2026-11-03
Timeline
- 2026-11-03 Threatist record created from CVE-2026-121556
- 2026-11-03 CISA SSVC decision points changed
- 2026-11-03 Priority changed: MEDIUM → LOW
- 2026-11-03 Alias added: GHSA-xvx6-5cj7-5p8g
- 2026-11-05 Priority changed: LOW → MEDIUM
References
Patch 1
Other 5
- GitHub Issue #32
- https://github.com/kerwincui/FastBee
- 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
More beecue vulnerabilities
- TI-2025-13928 beecue FastBee SIP Message ReqAbstractHandler.java getRootElement xml external entity reference CVSS 4.0MEDIUM 6.3
- TI-2026-83642 Code injection in beecue FastBee Groovy Script Executor CVSS 4.0MEDIUM 5.1
Sources
- CVE-2026-121556 · CVE Program
- CVE-2026-121556 · NVD
- FIRST EPSS
- GHSA-xvx6-5cj7-5p8g · GitHub Advisory Database · CC BY 4.0
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