Vulnerability · Published Oct 3, 2025 · Assigned by GitHub_M
CVE-2025-61673Karapace is vulnerable to Authentication Bypass
High 8.6
In plain English
A high-severity missing authentication in karapace from Aiven-Open. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 34% of all known vulnerabilities).
Official 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.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Aiven-Open | karapace | >= 5.0.0, < 5.0.2 |
Weakness: CWE-306, CWE-288 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:L