cve-2026-33557
HIGH CVSS 8.6 csaf_redhat
Description
This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.
Timeline
- Published
- 2026-04-20 13:28 UTC
- Last Modified
- 2026-06-30
CVSS Details
CVSS details not available.
Affected Products
No product information available.
Weaknesses (CWE)
References
No references available.
Linked Vulnerabilities
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},
{
"category": "default_component_of",
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"product_id": "red_hat_process_automation_7:kafka-clients"
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{
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"product_id": "streams_for_apache_kafka_2:connect-api"
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{
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{
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},
"vulnerabilities": [
{
"cve": "CVE-2026-33557",
"cwe": {
"id": "CWE-303",
"name": "Incorrect Implementation of Authentication Algorithm"
},
"discovery_date": "2026-04-20T14:01:07.601548+00:00",
"flags": [
{
"label": "vulnerable_code_not_present",
"product_ids": [
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}
],
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "2459739"
}
],
"notes": [
{
"category": "description",
"text": "A flaw was found in Apache Kafka. By default, the `sasl.oauthbearer.jwt.validator.class` property is set to `org.apache.kafka.common.security.oauthbearer.DefaultJwtValidator`, which does not validate JSON Web Token (JWT) signatures, issuers, or audiences. A remote attacker can exploit this by crafting a malicious JWT token with an arbitrary `preferred_username`, leading to an authentication bypass and unauthorized access to the Kafka broker.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "kafka: Apache Kafka: Authentication bypass via improper JWT validation",
"title": "Vulnerability summary"
},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
}
],
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"references": [
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},
{
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},
{
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},
{
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"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-33557"
},
{
"category": "external",
"summary": "http://www.openwall.com/lists/oss-security/2026/04/17/2",
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},
{
"category": "external",
"summary": "https://kafka.apache.org/cve-list",
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},
{
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"summary": "https://lists.apache.org/thread/v57o00hm6yszdpdnvqx2ss4561yh953h",
"url": "https://lists.apache.org/thread/v57o00hm6yszdpdnvqx2ss4561yh953h"
}
],
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},
{
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}
],
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{
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"attackVector": "NETWORK",
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"baseScore": 8.6,
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"confidentialityImpact": "HIGH",
"integrityImpact": "LOW",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:L",
"version": "3.1"
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],
"title": "kafka: Apache Kafka: Authentication bypass via improper JWT validation"
}
]
}
Enrichment data
Aggregated bundle (all enrichments)