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CVE-2026-33557 Apache Kafka: Missing JWT token validation in OAUTHBEARER authentication

🗓️ 20 Apr 2026 13:28:43Reported by apacheType 
cvelist
 cvelist
🔗 www.cve.org👁 26 Views

Kafka OAuthBearer JWT validation can be bypassed; set validator to BrokerJwtValidator. Fixed in Kafka 4.1.2 and later.

Related
Affected
Refs
ReporterTitlePublishedViews
Family
ATTACKERKB
CVE-2026-33557
20 Apr 202613:28
attackerkb
Chainguard
CVE-2026-33557 vulnerabilities
25 Apr 202613:17
cgr
Circl
CVE-2026-33557
17 Apr 202609:12
circl
CNNVD
Apache Kafka 安全漏洞
20 Apr 202600:00
cnnvd
CVE
CVE-2026-33557
20 Apr 202613:28
cve
EUVD
EUVD-2026-23846
20 Apr 202615:31
euvd
Github Security Blog
Apache Kafka does not validate JWT tokens in its OAUTHBEARER authentication implementation
20 Apr 202615:31
github
NVD
CVE-2026-33557
20 Apr 202614:16
nvd
OSV
BIT-KAFKA-2026-33557 Apache Kafka: Missing JWT token validation in OAUTHBEARER authentication
22 Apr 202608:40
osv
OSV
CGA-5X6P-RVMX-5PXP
25 Apr 202612:15
osv
Rows per page
[
  {
    "defaultStatus": "unaffected",
    "product": "Apache Kafka",
    "vendor": "Apache Software Foundation",
    "versions": [
      {
        "lessThanOrEqual": "4.1.1",
        "status": "affected",
        "version": "4.1.0",
        "versionType": "semver"
      }
    ]
  }
]

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