CVE-2021-32857Public exploitNetwork attack vector

Script execution via trailing-space closing-tag bypass

Published Feb 20, 2023 · Updated Mar 10, 2025

Cross-site scripting in Cockpit Next 0.12.2 and earlier allows attackers to execute browser scripts through crafted HTML content. The sanitizer in assets/lib/uikit/js/components/htmleditor.js ignores closing script tags containing trailing spaces, leaving malicious markup executable. The demonstrated path requires access to create an HTML field and entry, and script execution occurs when a user renders the content.

CVSS severity6.1
Medium
EPSS probability0.71%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Cross-site scripting in Cockpit Next 0.12.2 and earlier allows attackers to execute browser scripts through crafted HTML content. The sanitizer in assets/lib/uikit/js/components/htmleditor.js ignores closing script tags containing trailing spaces, leaving malicious markup executable. The demonstrated path requires access to create an HTML field and entry, and script execution occurs when a user renders the content.

The record

CVE
CVE-2021-32857
Published
Feb 20, 2023
Updated
Mar 10, 2025
Vendor
Microweber
Product
Microweber
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 20, 2023CVE publishedPublication date reported by the CVE source.
  2. Mar 10, 2025Record 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=0.12.2 <=0.12.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Microweber · Microweberversion=0.12.2 <=0.12.2

Published CVSS scores

6.1NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1059.007Command and Scripting Interpreter: JavaScript/JScript

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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