BIT-kafka-2026-33557

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Import Source

https://github.com/bitnami/vulndb/tree/main/data/kafka/BIT-kafka-2026-33557.json

JSON Data

https://api.osv.dev/v1/vulns/BIT-kafka-2026-33557

Aliases

CVE-2026-33557
GHSA-28jg-cgg7-j4wc

Published

2026-04-22T08:40:40.515Z

Modified

2026-04-24T15:56:29.709769604Z

Summary

Apache Kafka: Missing JWT token validation in OAUTHBEARER authentication

Details

A possible 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.

We advise the 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.

Database specific

{
    "severity": "Critical",
    "cpes": [
        "cpe:2.3:a:apache:kafka:*:*:*:*:*:maven:*:*"
    ]
}

References

Affected packages

Bitnami / kafka

Package

Name: kafka
Purl: pkg:bitnami/kafka

Severity

9.1 (Critical) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N CVSS Calculator

Affected ranges

Type: SEMVER
Events: Introduced

4.1.0

Fixed

4.1.2

Database specific

source

"https://github.com/bitnami/vulndb/tree/main/data/kafka/BIT-kafka-2026-33557.json"