GHSA-28jg-cgg7-j4wc

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Source
https://github.com/advisories/GHSA-28jg-cgg7-j4wc
Import Source
https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/04/GHSA-28jg-cgg7-j4wc/GHSA-28jg-cgg7-j4wc.json
JSON Data
https://api.osv.dev/v1/vulns/GHSA-28jg-cgg7-j4wc
Aliases
Downstream
Published
2026-04-20T15:31:52Z
Modified
2026-09-10T03:50:42Z
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
Summary
Apache Kafka does not validate JWT tokens in its OAUTHBEARER authentication implementation
Details

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.

Database specific 
{
    "cwe_ids": [
        "CWE-1285"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-04-24T15:29:31Z",
    "nvd_published_at": "2026-04-20T14:16:18Z",
    "severity": "CRITICAL"
}
References

Affected packages

Maven / org.apache.kafka:kafka-clients

Package

Name
org.apache.kafka:kafka-clients
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Purl
pkg:maven/org.apache.kafka/kafka-clients

Affected ranges

Type
ECOSYSTEM
Events
Introduced
4.1.0
Fixed
4.1.2

Affected versions

4.*
4.1.0
4.1.1

Database specific

source 
"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/04/GHSA-28jg-cgg7-j4wc/GHSA-28jg-cgg7-j4wc.json"