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CVE-2025-61673

Published: Oct 3, 2025

Modified: Oct 6, 2025

PUBLISHED

CVSS v3.1

8.6

HIGH

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.

Vendor	Product	Versions
Aiven-Open	karapace	affected `>= 5.0.0, < 5.0.2`

Weaknesses (CWE)

CVSS v3.1 Details

CVSS v3.1 Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:L

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

Low

Integrity

High

Availability

Low

References

https://github.com/Aiven-Open/karapace/security/advisories/GHSA-vq25-vcrw-gj53

x_refsource_CONFIRM

https://github.com/Aiven-Open/karapace/pull/1143/commits/c4038e9ce9fa504b433d59ac2944e337292922c7

x_refsource_MISC

https://github.com/Aiven-Open/karapace/releases/tag/5.0.2

x_refsource_MISC

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