CVE-2026-66070Network attack vectorHinoki check available

Management API state changes via credentialed origin reflection

Published Sep 23, 2026 · Updated Sep 23, 2026

Improper CORS handling in RabbitMQ Server allows remote attackers to alter management state through a signed-in administrator's browser. In rabbit_mgmt_cors.erl, match_origin/1 reflects an untrusted Origin while also enabling credentialed cross-origin requests. Exploitation requires wildcard CORS configuration and a signed-in administrator with cached HTTP Basic credentials to visit a malicious page, which can issue authenticated state-changing management API requests.

CVSS severity7.6
High
EPSS probability0.41%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
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Summary

What happened

Improper CORS handling in RabbitMQ Server allows remote attackers to alter management state through a signed-in administrator's browser. In rabbit_mgmt_cors.erl, match_origin/1 reflects an untrusted Origin while also enabling credentialed cross-origin requests. Exploitation requires wildcard CORS configuration and a signed-in administrator with cached HTTP Basic credentials to visit a malicious page, which can issue authenticated state-changing management API requests.

The record

CVE
CVE-2026-66070
Published
Sep 23, 2026
Updated
Sep 23, 2026
Vendor
RabbitMQ
Product
RabbitMQ Server
Classifications
CWE-942, T1189
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 23, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 23, 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, < 3.13.17
  2. Affected versionversion=>= 4.0.0, < 4.0.22
  3. Affected versionversion=>= 4.1.0, < 4.1.13
  4. Affected versionversion=>= 4.2.0, < 4.2.6

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

RabbitMQ · RabbitMQ Serverversion=>= 3.13.0, < 3.13.17; version=>= 4.0.0, < 4.0.22; version=>= 4.1.0, < 4.1.13; version=>= 4.2.0, < 4.2.6

Published CVSS scores

7.6GitHubCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:H/VI:H/VA:N/SC:N/SI:N/SA: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.

Activity data is delayed. The latest report is Sep 28, 2026.

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

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-942Permissive Cross-domain Security Policy with Untrusted Domains
T1189Drive-by Compromise

Public exploit references

No public exploit references are available in this record.

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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