Is CVE-2026-121556 being exploited?

No public exploit is currently tracked.

How severe is CVE-2026-121556?

CVE-2026-121556 has a CVSS v3 severity of HIGH (8.3).

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CVE-2026-121556

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.