CVE-2026-18801: Openmeter

Critical severity, CVSS 9.3. EPSS: 0.4% chance of exploitation in the next 30 days.

OpenMeter contains a stored, or second-order, SQL injection vulnerability in the handling of customer usage-attribution values. An attacker who can create or update a customer can store a malicious value in the usageAttribution.key or usageAttribution.subjectKeys fields. When that customer is subsequently used in a meter or event query, OpenMeter inserts the stored value into a ClickHouse WITH map(...) expression using string concatenation. OpenMeter versions from v1.0.0-beta.218 through v1.0.0-beta.231 are affected.

Affected products

• Openmeter Openmeter

Published 2026-08-04. Last modified 2026-08-31.