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Vulnerability details

9.1/10
CVSS 3.1
GHSA-28jg-cgg7-j4wc
not_affected Published 2026-04-20 Updated 2026-04-24
GitHub Advisory
Vulnerability Data from Dependency-Track
Affected versions
Score
9.1 CVSS 3.1 GITHUB CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Description
A security vulnerability has been identified in Apache Kafka. By default, the broker property `sasl.oauthbearer.jwt.validator.class` is set to `org.apache.kafka.common.security.oauthbearer.DefaultJwtValidator`. It accepts any JWT token without validating its signature, issuer, or audience. An attacker can generate a JWT token from any issuer with the `preferred_username` set to any user, and the broker will accept it. Apache advises Kafka users using kafka v4.1.0 or v4.1.1 to set the config `sasl.oauthbearer.jwt.validator.class` to `org.apache.kafka.common.security.oauthbearer.BrokerJwtValidator` explicitly to avoid this vulnerability. Since Kafka v4.1.2 and v4.2.0 and later, the issue is fixed and will correctly validate the JWT token.
Same vulnerability as
CVE-2026-33557 not_affected according to EUVD-2026-23846
Analysis Read only
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