CVE-2026-66076— RabbitMQ: Cross-vhost quorum-queue status and stream tracking disclosure
Quick assessment
Affected
rabbitmq rabbitmq-server
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
RabbitMQ 是一款消息和流式中间件。在 3.13.15、4.0.20、4.1.11、4.2.6 和 4.3.0 之前的版本中， 函数调用了 ，该函数仅检查管理标签（management tag），而未调用 。此外， 处理器直接从路径中读取 vhost，而未验证用户是否有权访问该 vhost。因此，任何拥有管理标签的用户都可以读取无法访问的 vhost 中仲裁队列（quorum queues）的 Raft 状态信息，包括领导者（leader）、成员（members）、任期（term）和提交索引（commit i
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I. Basic Information for CVE-2026-66076
Vulnerability Information
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Vulnerability Title
RabbitMQ: Cross-vhost quorum-queue status and stream tracking disclosure
Source: CVE Program / CVE List V5
Vulnerability Description
RabbitMQ is a messaging and streaming broker. Prior to versions 3.13.15, 4.0.20, 4.1.11, 4.2.6, and 4.3.0, is_authorized/2 calls rabbit_mgmt_util:is_authorized/2, which checks only the management tag, instead of is_authorized_vhost/2. The /api/queues/quorum/:vhost/:queue/status handler reads the vhost from the path without checking that the user can access it. Any management-tagged user can therefore read Raft status, including leader, members, term, and commit index, for quorum queues in inaccessible vhosts, exposing cross-tenant queue names and cluster topology. The management plugin must be enabled and the attacker must have a management tag. This issue is fixed in versions 3.13.15, 4.0.20, 4.1.11, 4.2.6, and 4.3.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制缺失
Source: CVE Program / CVE List V5
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| rabbitmq | rabbitmq-server | >= 3.13.0, < 3.13.15 | - |
|
II. Public POCs for CVE-2026-66076
| # | POC Description | Source Link | Shenlong Link |
|---|
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Vendor Pages for CVE-2026-66076 (1)
Other References for CVE-2026-66076 (1)
Same Patch Batch · rabbitmq · 2026-09-23 · 25 CVEs total
| CVE-2026-67404 | 9.2 CRITICAL | RabbitMQ: OAuth2 silent verify_none fallback for JWKS fetch |
| CVE-2026-67231 | 9.1 CRITICAL | RabbitMQ: Trust-store whitelist by Issuer+Serial only |
| CVE-2026-66079 | 8.2 HIGH | RabbitMQ: Pre-auth AMQP 1.0 array32 zero-width element DoS |
| CVE-2026-67232 | 8.2 HIGH | RabbitMQ: Web-MQTT decompression bomb |
| CVE-2026-66070 | 7.6 HIGH | RabbitMQ: CORS * reflects Origin with Allow-Credentials |
| CVE-2026-66077 | 7.3 HIGH | RabbitMQ: Stored XSS via TLS peer-certificate DN in management UI |
| CVE-2026-67235 | 7.1 HIGH | RabbitMQ: AMQP 0-9-1 body assembly never validates accumulated size |
| CVE-2026-67238 | 7.1 HIGH | RabbitMQ: Atom-table exhaustion via reply-to queue name decoding |
| CVE-2026-67228 | 6.9 MEDIUM | RabbitMQ: Atom exhaustion: to_atom on runtime-parameter component |
| CVE-2026-67229 | 6.9 MEDIUM | RabbitMQ: Admin-only atom exhaustion: atomize_keys on vhost metadata |
| CVE-2026-67219 | 6.0 MEDIUM | RabbitMQ: Consistent-hash exchange unbounded weight |
| CVE-2026-67220 | 6.0 MEDIUM | RabbitMQ: JMS topic exchange erl_scan atom exhaustion |
| CVE-2026-66067 | 6.0 MEDIUM | RabbitMQ: Stream protocol skips per vhost per user connection limits |
| CVE-2026-66074 | 6.0 MEDIUM | RabbitMQ: ReDoS via management API ?name= filter |
| CVE-2026-66072 | 6.0 MEDIUM | RabbitMQ: Atom table exhaustion via stream `chunk_selector` |
| CVE-2026-66080 | 5.9 MEDIUM | RabbitMQ: Super-stream partitions unbounded allocation |
| CVE-2026-67221 | 5.9 MEDIUM | RabbitMQ: AMQP 1.0 shovel status exposes plaintext URI passwords |
| CVE-2026-66068 | 5.6 MEDIUM | RabbitMQ: Shovel DEBUG log of full state exposes decrypted URIs |
| CVE-2026-67405 | 5.3 MEDIUM | RabbitMQ: CSWSH on Web-STOMP / Web-MQTT (no Origin validation) |
| CVE-2026-66069 | 2.3 LOW | RabbitMQ: Monitoring-tag DELETE of auth-attempt metrics |
Showing top 20 of 25 CVEs. View all on vendor page → →
IV. Related Vulnerabilities
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V. Comments for CVE-2026-66076
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