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GHSA-28jg-cgg7-j4wc
GHSA-28jg-cgg7-j4wc

Author: advisory-database[bot]

advisories/github-reviewed/2026/04/GHSA-28jg-cgg7-j4wc/GHSA-28jg-cgg7-j4wc.json

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+{
+  "schema_version": "1.4.0",
+  "id": "GHSA-28jg-cgg7-j4wc",
+  "modified": "2026-04-24T15:29:32Z",
+  "published": "2026-04-20T15:31:52Z",
+  "aliases": [
+    "CVE-2026-33557"
+  ],
+  "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.\n\nApache 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.",
+  "severity": [
+    {
+      "type": "CVSS_V3",
+      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N"
+    }
+  ],
+  "affected": [
+    {
+      "package": {
+        "ecosystem": "Maven",
+        "name": "org.apache.kafka:kafka-clients"
+      },
+      "ranges": [
+        {
+          "type": "ECOSYSTEM",
+          "events": [
+            {
+              "introduced": "4.1.0"
+            },
+            {
+              "fixed": "4.1.2"
+            }
+          ]
+        }
+      ]
+    }
+  ],
+  "references": [
+    {
+      "type": "ADVISORY",
+      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-33557"
+    },
+    {
+      "type": "WEB",
+      "url": "https://github.com/apache/kafka/commit/01d8e7db8d08dbd538892b409457ea6bfcc2a422"
+    },
+    {
+      "type": "PACKAGE",
+      "url": "https://github.com/apache/kafka"
+    },
+    {
+      "type": "WEB",
+      "url": "https://kafka.apache.org/cve-list"
+    },
+    {
+      "type": "WEB",
+      "url": "https://lists.apache.org/thread/v57o00hm6yszdpdnvqx2ss4561yh953h"
+    },
+    {
+      "type": "WEB",
+      "url": "http://www.openwall.com/lists/oss-security/2026/04/17/2"
+    }
+  ],
+  "database_specific": {
+    "cwe_ids": [
+      "CWE-1285"
+    ],
+    "severity": "CRITICAL",
+    "github_reviewed": true,
+    "github_reviewed_at": "2026-04-24T15:29:31Z",
+    "nvd_published_at": "2026-04-20T14:16:18Z"
+  }
+}