CVE-2023-40577: Debian Linux

Medium severity, CVSS 5.4. EPSS: 0.6% chance of exploitation in the next 30 days.

Alertmanager handles alerts sent by client applications such as the Prometheus server. An attacker with the permission to perform POST requests on the /api/v1/alerts endpoint could be able to execute arbitrary JavaScript code on the users of Prometheus Alertmanager. This issue has been fixed in Alertmanager version 0.2.51.

Affected products

• Debian Debian Linux: version 10.0 only
• Prometheus Alertmanager: version 0.25.0 only

Published 2023-08-25. Last modified 2026-06-17.