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CVE-2026-66070

RabbitMQ: CORS * reflects Origin with Allow-Credentials PUBLISHED

Description (CNA)

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.

Affected (CNA)

Vendor / productVersions
rabbitmq / rabbitmq-serveraffected >= 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

CWE

CWE-942

References

ADP enrichment

CISA-ADP

No English description supplied.

No references supplied.