CVE-2023-40577

Name of the Vulnerable Software and Affected Versions Alertmanager versions prior to 0.2.51

Description The issue is related to the improper neutralization of input data during web page generation in the /api/v1/alerts endpoint of the Alertmanager component in the Prometheus monitoring system. An attacker with permission to perform POST requests on the /api/v1/alerts endpoint could execute arbitrary JavaScript code on the users of Prometheus Alertmanager.

Recommendations For versions prior to 0.2.51, upgrade to Alertmanager version 0.2.51. As a temporary workaround, consider setting up a reverse proxy in front of the Alertmanager web server to forbid access to the /api/v1/alerts endpoint.