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          "dateUpdated": "2026-04-20T13:38:51.117Z",
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            "url": "http://www.openwall.com/lists/oss-security/2026/04/17/2"
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            "cvssV3_1": {
              "attackComplexity": "LOW",
              "attackVector": "NETWORK",
              "availabilityImpact": "NONE",
              "baseScore": 9.1,
              "baseSeverity": "CRITICAL",
              "confidentialityImpact": "HIGH",
              "integrityImpact": "HIGH",
              "privilegesRequired": "NONE",
              "scope": "UNCHANGED",
              "userInteraction": "NONE",
              "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N",
              "version": "3.1"
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            "other": {
              "content": {
                "id": "CVE-2026-33557",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "yes"
                  },
                  {
                    "Technical Impact": "partial"
                  }
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                "role": "CISA Coordinator",
                "timestamp": "2026-04-20T14:29:31.424817Z",
                "version": "2.0.3"
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          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Apache Kafka",
          "vendor": "Apache Software Foundation",
          "versions": [
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              "lessThanOrEqual": "4.1.1",
              "status": "affected",
              "version": "4.1.0",
              "versionType": "semver"
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          "type": "finder",
          "value": "\u041f\u0430\u0432\u0435\u043b \u0420\u043e\u043c\u0430\u043d\u043e\u0432 \u003cpromanov1994@gmail.com\u003e"
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              "value": "\u003cdiv\u003eA possible security vulnerability has been identified in Apache Kafka.\u003c/div\u003e\u003cdiv\u003eBy default, the broker property `sasl.oauthbearer.jwt.validator.class` is\u0026nbsp;set to `org.apache.kafka.common.security.oauthbearer.DefaultJwtValidator`. It accepts any JWT token without validating its\u0026nbsp;signature, issuer, or audience. An attacker can generate a JWT\u0026nbsp;token from any issuer with the `preferred_username` set to any user, and the broker will accept it.\u003c/div\u003e\u003cdiv\u003eWe 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.\u003c/div\u003e\u003cbr\u003e"
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          ],
          "value": "A possible security vulnerability has been identified in Apache Kafka.\n\nBy default, the broker property `sasl.oauthbearer.jwt.validator.class` is\u00a0set to `org.apache.kafka.common.security.oauthbearer.DefaultJwtValidator`. It accepts any JWT token without validating its\u00a0signature, issuer, or audience. An attacker can generate a JWT\u00a0token from any issuer with the `preferred_username` set to any user, and the broker will accept it.\n\nWe 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."
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      ],
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          "descriptions": [
            {
              "cweId": "CWE-1285",
              "description": "CWE-1285 Improper Validation of Specified Index, Position, or Offset in Input",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-04-20T13:28:43.669Z",
        "orgId": "f0158376-9dc2-43b6-827c-5f631a4d8d09",
        "shortName": "apache"
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      "references": [
        {
          "tags": [
            "vendor-advisory"
          ],
          "url": "https://kafka.apache.org/cve-list"
        },
        {
          "tags": [
            "mailing-list"
          ],
          "url": "https://lists.apache.org/thread/v57o00hm6yszdpdnvqx2ss4561yh953h"
        }
      ],
      "source": {
        "discovery": "UNKNOWN"
      },
      "title": "Apache Kafka: Missing JWT token validation in OAUTHBEARER authentication",
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        "engine": "Vulnogram 0.2.0"
      }
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    "assignerOrgId": "f0158376-9dc2-43b6-827c-5f631a4d8d09",
    "assignerShortName": "apache",
    "cveId": "CVE-2026-33557",
    "datePublished": "2026-04-20T13:28:43.669Z",
    "dateReserved": "2026-03-23T03:14:53.527Z",
    "dateUpdated": "2026-04-20T14:30:30.936Z",
    "state": "PUBLISHED"
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