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CVE-2026-66078— RabbitMQ: protected tag bypass via bulk-delete

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 是一个消息和流式传输代理。在 3.13.0 到 3.13.15、4.0.20、4.1.11 和 4.2.6 版本之间，通过批量删除操作可绕过对受保护标签的限制。 接口拒绝删除标记为受保护（即 检查 ）的用户。然而， 接口会遍历提供的用户名列表并直接调用 函数，而该函数并未执行对受保护标签的检查，因此未能有效阻止此类操作。这使得管理员可以通过批量接口删除具有受保护标签的服务账户，从而绕过了测试套件确认存在的防护机制。攻击者只需具备管理员标签即可删除受保护标签的用户。此问题已在 3.13.15、4.0

CVSS 2.1 · Low EPSS 0.36% · P27

Affected Version Matrix 4

VendorProduct Version RangeStatus
rabbitmq rabbitmq-server >= 3.13.0, < 3.13.15 affected
>= 4.0.0, < 4.0.20 affected
>= 4.1.0, < 4.1.11 affected
>= 4.2.0, < 4.2.6 affected
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I. Basic Information for CVE-2026-66078

Vulnerability Information
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Vulnerability Title
RabbitMQ: protected tag bypass via bulk-delete
Source: CVE Program / CVE List V5
Vulnerability Description
RabbitMQ is a messaging and streaming broker. From 3.13.0 until 3.13.15 and 4.0.20 and 4.1.11 and 4.2.6, protected tag bypass via bulk-delete. dELETE /api/users/:name refuses to delete users tagged protected (rabbitmgmtwmuser:deleteresource/2 checks isprotecteduser). POST /api/users/bulk-delete iterates the supplied username list and calls rabbitauthbackendinternal:deleteuser/2 directly , that function has no protected-tag check , so the guard is silently An administrator can delete protected-tagged service accounts via the bulk endpoint, bypassing a safeguard the test suite confirms is rabbitmqmanagement enabled Attacker has the administrator tag A protected-tagged user. This issue is fixed in versions 3.13.15 and 4.0.20 and 4.1.11 and 4.2.6.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:N/VC:N/VI:L/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-2026-66078

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III. Intelligence Information for CVE-2026-66078

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Patches & Fixes for CVE-2026-66078 (2)

Vendor Pages for CVE-2026-66078 (1)

Same Patch Batch · rabbitmq · 2026-09-25 · 28 CVEs total

CVE-2026-67236 8.2 HIGH RabbitMQ: Plaintext username:password stored in an insecure cookie after successful POST /
CVE-2026-67409 8.2 HIGH RabbitMQ: JWKS Fetch Ignores HTTP Response Status Code - Signing Key Destruction Causes Au
CVE-2026-67410 8.2 HIGH RabbitMQ: OAuth2 Client Secret Exposed via Unauthenticated JavaScript Endpoint
CVE-2026-67239 7.6 HIGH RabbitMQ: Stored XSS via TLS peer-certificate DN in stream-management UI
CVE-2026-67237 7.5 HIGH RabbitMQ: Reflected XSS via the OAuth bootstrap JS endpoint
CVE-2026-67419 7.1 HIGH RabbitMQ: Consecutive topic wildcards cause combinatorial routing work
CVE-2026-67408 7.1 HIGH RabbitMQ: Stream Management Super-Stream Binding Keys Allocation Allows Low-Privilege Node
CVE-2026-67226 6.9 MEDIUM RabbitMQ: Admin-only atom exhaustion: PUT /api/users tags list
CVE-2026-61837 6.3 MEDIUM RabbitMQ: AMQP 1.0 management `GET /bindings` exposes full binding topology to any authent
CVE-2026-67242 6.3 MEDIUM RabbitMQ: OAuth2 is_integer(Exp) guard skips token-expiry checks for float exp
CVE-2026-67230 6.3 MEDIUM RabbitMQ: Web-STOMP unbounded pre-auth accumulation
CVE-2026-67223 6.3 MEDIUM RabbitMQ: LDAP DN injection via unescaped substitution
CVE-2026-67225 6.3 MEDIUM RabbitMQ: Stream-protocol frame length never validated against frame_max
CVE-2026-67411 6.0 MEDIUM RabbitMQ: Web MQTT with PROXY Protocol enabled: a loopback-only user permission bypass
CVE-2026-67412 6.0 MEDIUM RabbitMQ: Federation upstream skips vhost authorization allowing cross-vhost message acces
CVE-2026-67413 6.0 MEDIUM RabbitMQ: Authenticated RabbitMQ JMS Topic Selector Users Can Consume Broker CPU with an U
CVE-2026-66073 6.0 MEDIUM RabbitMQ: Atom table exhaustion via management API node field
CVE-2026-66071 6.0 MEDIUM RabbitMQ: Atom exhaustion: OAuth2 JWT tag: scope values
CVE-2026-67415 5.9 MEDIUM RabbitMQ: Shovel Management Atom Exhaustion Allows Persistent Broker-Wide Denial of Servic
CVE-2026-67222 5.9 MEDIUM RabbitMQ: list_to_atom on auth_mechanism URI tokens in amqp_client

Showing top 20 of 28 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: rabbitmq-server
Same vendor: rabbitmq
Same weakness: CWE-862

V. Comments for CVE-2026-66078

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