CVE-2026-67239Network attack vectorHinoki check available

Stored XSS via unescaped certificate DN fields

Published Sep 25, 2026 · Updated Sep 25, 2026

Stored XSS in affected RabbitMQ Server releases allows remote attackers to execute script in an operator's browser via a crafted certificate DN. The streamConnection.ejs template inserts peer certificate subject and issuer values into HTML with raw EJS interpolation and no output encoding. Exploitation requires both stream plugins, peer-verifying TLS, a trusted certificate with an attacker-chosen DN, and an operator opening the connection detail page; script then runs with that operator's management-UI access.

CVSS severity7.6
High
EPSS probability0.16%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Stored XSS in affected RabbitMQ Server releases allows remote attackers to execute script in an operator's browser via a crafted certificate DN. The streamConnection.ejs template inserts peer certificate subject and issuer values into HTML with raw EJS interpolation and no output encoding. Exploitation requires both stream plugins, peer-verifying TLS, a trusted certificate with an attacker-chosen DN, and an operator opening the connection detail page; script then runs with that operator's management-UI access.

The record

CVE
CVE-2026-67239
Published
Sep 25, 2026
Updated
Sep 25, 2026
Vendor
RabbitMQ
Product
RabbitMQ Server
Classifications
CWE-79, T1189
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 25, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 25, 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, < 3.13.18
  2. Affected versionversion=>= 4.0.0, < 4.0.23
  3. Affected versionversion=>= 4.1.0, < 4.1.14
  4. Affected versionversion=>= 4.2.0, < 4.2.9
  5. Affected versionversion=>= 4.3.0, < 4.3.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

RabbitMQ · RabbitMQ Serverversion=>= 3.13.0, < 3.13.18; version=>= 4.0.0, < 4.0.23; version=>= 4.1.0, < 4.1.14; version=>= 4.2.0, < 4.2.9; version=>= 4.3.0, < 4.3.3

Published CVSS scores

7.6RabbitMQ GitHub Security AdvisoryCVSS: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-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
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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