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CVE-2025-61673— Karapace is vulnerable to Authentication Bypass

Quick assessment

Affected
Aiven-Open karapace
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

karapace是Aiven Open开源的一个消息队列工具。 Karapace 5.0.0版本和5.0.1版本存在访问控制错误漏洞，该漏洞源于请求缺少Authorization标头时跳过令牌验证逻辑，可能导致未经验证的用户读取和写入Schema Registry端点。

CVSS 8.6 · High EPSS 0.37% · P30
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I. Basic Information for CVE-2025-61673

Vulnerability Information
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Vulnerability Title
Karapace is vulnerable to Authentication Bypass
Source: CVE Program / CVE List V5
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
关键功能的认证机制缺失
Source: CVE Program / CVE List V5
Vulnerability Title
Karapace 访问控制错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
karapace是Aiven Open开源的一个消息队列工具。 Karapace 5.0.0版本和5.0.1版本存在访问控制错误漏洞，该漏洞源于请求缺少Authorization标头时跳过令牌验证逻辑，可能导致未经验证的用户读取和写入Schema Registry端点。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Aiven-Open karapace >= 5.0.0, < 5.0.2 -

II. Public POCs for CVE-2025-61673

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 8547 chars
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Vulnerability reproduction recording (real sandbox build + trigger, exclusive)
In-depth vulnerability mechanism
Trigger conditions & impact
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Exploit chain & mitigation
POC zip download
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III. Intelligence Information for CVE-2025-61673

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Patches & Fixes for CVE-2025-61673 (1)

Vendor Advisories for CVE-2025-61673 (1)

Vendor Pages for CVE-2025-61673 (1)

IV. Related Vulnerabilities

Same product: karapace
Same vendor: Aiven-Open
Same weakness: CWE-306

V. Comments for CVE-2025-61673

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