CVE-2026-66070 (GCVE-0-2026-66070)

Vulnerability from cvelistv5 – Published: 2026-09-23 19:59 – Updated: 2026-09-23 19:59
VLAI
Title
RabbitMQ: CORS * reflects Origin with Allow-Credentials
Summary
RabbitMQ is a messaging and streaming broker. Prior to versions 3.13.17, 4.0.22, 4.1.13, and 4.2.6, match_origin/1 returned the bare reflected Origin and allowed credentials even when the wildcard "" was configured, so the response echoed the attacker's origin together with Access-Control-Allow-Credentials. The affected code is rabbit_mgmt_cors.erl. When the management plugin is configured with a wildcard CORS origin (cors_allow_origins = ""), the handler reflects the request Origin back in Access-Control-Allow-Origin and also sends Access-Control-Allow-Credentials: true. A malicious web page that a signed-in administrator visits can then use that administrator's cached HTTP Basic credentials to issue authenticated, state-changing requests to the management API. Preconditions include The management plugin is configured with the wildcard cors_allow_origins = "*", which is an explicit operator misconfiguration A target administrator has a cached HTTP Basic-auth session in the browser. This issue is fixed in versions 3.13.17, 4.0.22, 4.1.13, and 4.2.6.
Severity
7.6 (High)
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
CWE
  • CWE-942 - Permissive Cross-domain Policy with Untrusted Domains
Assigner
References
Impacted products
Vendor Product Version CPE status
rabbitmq rabbitmq-server Affected: >= 3.13.0, < 3.13.17
Affected: >= 4.0.0, < 4.0.22
Affected: >= 4.1.0, < 4.1.13
Affected: >= 4.2.0, < 4.2.6
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            {
              "status": "affected",
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        }
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            "privilegesRequired": "NONE",
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            "subConfidentialityImpact": "NONE",
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            "vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N",
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      "providerMetadata": {
        "dateUpdated": "2026-09-23T19:59:58.788Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
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          "url": "https://github.com/rabbitmq/rabbitmq-server/releases/tag/v4.2.6"
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      "source": {
        "advisory": "GHSA-p3hp-v9wh-ghm7",
        "discovery": "UNKNOWN"
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      "title": "RabbitMQ: CORS * reflects Origin with Allow-Credentials"
    }
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    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
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    "datePublished": "2026-09-23T19:59:58.788Z",
    "dateReserved": "2026-07-23T23:25:28.897Z",
    "dateUpdated": "2026-09-23T19:59:58.788Z",
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          }
        ],
        "id": "CVE-2026-66070",
        "lastModified": "2026-09-23T20:17:12.850",
        "metrics": {
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                "availabilityRequirement": "NOT_DEFINED",
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                "confidentialityRequirement": "NOT_DEFINED",
                "exploitMaturity": "NOT_DEFINED",
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                "modifiedAttackRequirements": "NOT_DEFINED",
                "modifiedAttackVector": "NOT_DEFINED",
                "modifiedPrivilegesRequired": "NOT_DEFINED",
                "modifiedSubAvailabilityImpact": "NOT_DEFINED",
                "modifiedSubConfidentialityImpact": "NOT_DEFINED",
                "modifiedSubIntegrityImpact": "NOT_DEFINED",
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                "modifiedVulnAvailabilityImpact": "NOT_DEFINED",
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                "modifiedVulnIntegrityImpact": "NOT_DEFINED",
                "privilegesRequired": "NONE",
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                "valueDensity": "NOT_DEFINED",
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}



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