Aiven-Open karapace up to 5.0.1 Schema Registry Endpoint missing authentication

Summaryinfo

A vulnerability was found in Aiven-Open karapace up to 5.0.1. It has been rated as critical. Impacted is an unknown function of the component Schema Registry Endpoint. Performing a manipulation results in missing authentication. This vulnerability is identified as CVE-2025-61673. The attack can be initiated remotely. There is not any exploit available. Upgrading the affected component is advised.

Detailsinfo

A vulnerability, which was classified as critical, was found in Aiven-Open karapace up to 5.0.1. This affects an unknown function of the component Schema Registry Endpoint. The manipulation with an unknown input leads to a missing authentication vulnerability. CWE is classifying the issue as CWE-306. The product does not perform any authentication for functionality that requires a provable user identity or consumes a significant amount of resources. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

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.

It is possible to read the advisory at github.com. This vulnerability is uniquely identified as CVE-2025-61673 since 09/29/2025. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. The technical details are unknown and an exploit is not publicly available.

Upgrading to version 5.0.2 eliminates this vulnerability. The upgrade is hosted for download at github.com. Applying a patch is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2025-32431). Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

Vendor

• Aiven-Open

Name

• karapace

Version

• 5.0.0
• 5.0.1

Website

• Product: https://github.com/Aiven-Open/karapace/

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Be aware that VulDB is the high quality source for vulnerability data.

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