CVE-2026-57217Public exploitNetwork attack vector

Cross-tenant routing bypass via fail-open permission lookup

Published Jul 10, 2026 · Updated Jul 10, 2026

Incorrect authorization in RabbitMQ Server allows remote authenticated users to route messages outside permitted topic keys. The Khepri topic-permission helper converts every unsuccessful metadata response, including timeouts, to undefined, which the internal authorization backend interprets as allow. Exploitation requires a low-privileged tenant with topic access during a Khepri lookup failure and exposes cross-tenant messages in affected 3.13.0 through 3.13.14, 4.0.0 through 4.0.20, 4.1.0 through 4.1.10, and 4.2.0 through 4.2.5 releases.

CVSS severity7.0
High
EPSS probability0.56%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Incorrect authorization in RabbitMQ Server allows remote authenticated users to route messages outside permitted topic keys. The Khepri topic-permission helper converts every unsuccessful metadata response, including timeouts, to undefined, which the internal authorization backend interprets as allow. Exploitation requires a low-privileged tenant with topic access during a Khepri lookup failure and exposes cross-tenant messages in affected 3.13.0 through 3.13.14, 4.0.0 through 4.0.20, 4.1.0 through 4.1.10, and 4.2.0 through 4.2.5 releases.

The record

CVE
CVE-2026-57217
Published
Jul 10, 2026
Updated
Jul 10, 2026
Vendor
RabbitMQ
Product
RabbitMQ Server
Classifications
CWE-863, CWE-280, T1190
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 10, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 10, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=>= 3.13.0, < 3.13.15
  2. Affected versionversion=>= 4.0.0, < 4.0.21
  3. Affected versionversion=>= 4.1.0, < 4.1.11
  4. Affected versionversion=>= 4.2.0, < 4.2.6

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

RabbitMQ · RabbitMQ Serverversion=>= 3.13.0, < 3.13.15; version=>= 4.0.0, < 4.0.21; version=>= 4.1.0, < 4.1.11; version=>= 4.2.0, < 4.2.6

Published CVSS scores

6.5NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
7.0GitHub, Inc.CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:N/VA:N/SC:H/SI:N/SA:N
6.5Red HatCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-863Incorrect Authorization
CWE-280Improper Handling of Insufficient Permissions or Privileges
T1190Exploit Public-Facing Application

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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