Vulnerability Description
Karapace is an open-source implementation of Kafka REST and Schema Registry. Versions 5.0.0 and 5.0.1 contain an authentication bypass vulnerability when configured to use OAuth 2.0 Bearer Token authentication. If a request is sent without an Authorization header, the token validation logic is skipped entirely, allowing an unauthenticated user to read and write to Schema Registry endpoints that should otherwise be protected. This effectively renders the OAuth authentication mechanism ineffective. This issue is fixed in version 5.0.2.
CVSS Score
HIGH
Related Weaknesses (CWE)
References
- https://github.com/Aiven-Open/karapace/pull/1143/commits/c4038e9ce9fa504b433d59a
- https://github.com/Aiven-Open/karapace/releases/tag/5.0.2
- https://github.com/Aiven-Open/karapace/security/advisories/GHSA-vq25-vcrw-gj53
FAQ
What is CVE-2025-61673?
CVE-2025-61673 is a vulnerability with a CVSS score of 8.6 (HIGH). Karapace is an open-source implementation of Kafka REST and Schema Registry. Versions 5.0.0 and 5.0.1 contain an authentication bypass vulnerability when configured to use OAuth 2.0 Bearer Token authe...
How severe is CVE-2025-61673?
CVE-2025-61673 has been rated HIGH with a CVSS base score of 8.6/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2025-61673?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.