CVE-2021-32718Network attack vector

Stored XSS via unescaped user name popup

Published Jun 28, 2021 · Updated Aug 3, 2024

Stored XSS in RabbitMQ Server before 3.8.17 allows remote authenticated users to execute JavaScript through a crafted user name. The new-user route in dispatcher.js copied res.req_params.username directly into show_popup without applying fmt_escape_html. Exploitation requires elevated user-management permission and a user interaction that renders the confirmation popup in a management UI session.

CVSS severity3.1
Low
EPSS probability1.43%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored XSS in RabbitMQ Server before 3.8.17 allows remote authenticated users to execute JavaScript through a crafted user name. The new-user route in dispatcher.js copied res.req_params.username directly into show_popup without applying fmt_escape_html. Exploitation requires elevated user-management permission and a user interaction that renders the confirmation popup in a management UI session.

The record

CVE
CVE-2021-32718
Published
Jun 28, 2021
Updated
Aug 3, 2024
Vendor
RabbitMQ
Product
RabbitMQ Server
Classifications
CWE-80, T1203
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Jun 28, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

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

  1. Affected versionversion=< 3.8.17

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

RabbitMQ · RabbitMQ Serverversion=< 3.8.17

Published CVSS scores

5.4UbuntuCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
3.1GitHubCVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:L/I:L/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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-80Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS)
T1203Exploitation for Client Execution

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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