CVE-2021-31232: Linuxfoundation Cortex

Medium severity, CVSS 5.5. EPSS: 0.4% chance of exploitation in the next 30 days.

The Alertmanager in CNCF Cortex before 1.8.1 has a local file disclosure vulnerability when -experimental.alertmanager.enable-api is used. The HTTP basic auth password_file can be used as an attack vector to send any file content via a webhook. The alertmanager templates can be used as an attack vector to send any file content because the alertmanager can load any text file specified in the templates list.

Affected products

• Linuxfoundation Cortex: before 1.8.1 (fixed in 1.8.1)

Published 2021-04-30. Last modified 2026-06-17.