SigNoz before 0.133.0 contains a broken access control vulnerability that allows authenticated users to access other organizations’ alert rules by supplying a target rule UUID, as the alert rule store predicates fail to filter by organization ID. Attackers can read, edit, and delete alert rules belonging to other organizations by exploiting the missing tenant isolation check, bypassing multi‑tenant access controls.

Any deployment of SigNoz running a version earlier than 0.133.0 in a multi‑tenant configuration is affected. Systems that expose the alert rule API or UI to authenticated users, such as the open‑source instances or self‑hosted installations, fall under this impact.

The CVSS score of 6.1 indicates moderate severity. The EPSS score of < 1% shows a low probability of exploitation. The vulnerability is not listed in the CISA KEV catalog. Attackers only need to be authenticated and know a target rule UUID, and they can then exploit the missing tenant isolation to read, modify, or delete alert rules across organization boundaries.