CVE-2021-20744Network attack vector

Arbitrary script execution in user browsers

Published Jun 22, 2021 · Updated Aug 3, 2024

Cross-site scripting in EC-CUBE Category Content Plugin before 1.0.1 allows remote attackers to execute arbitrary scripts in a user's browser. Public advisories do not identify the affected input, handler, or unsafe output operation. Exploitation requires an administrator or user to visit a crafted page and perform an operation, and only EC-CUBE 3.0.0 through 3.0.8 hosts are affected.

CVSS severity6.1
Medium
EPSS probability0.75%
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 EC-CUBE Category Content Plugin before 1.0.1 allows remote attackers to execute arbitrary scripts in a user's browser. Public advisories do not identify the affected input, handler, or unsafe output operation. Exploitation requires an administrator or user to visit a crafted page and perform an operation, and only EC-CUBE 3.0.0 through 3.0.8 hosts are affected.

The record

CVE
CVE-2021-20744
Published
Jun 22, 2021
Updated
Aug 3, 2024
Vendor
EC-CUBE CO.,LTD.
Product
EC-CUBE Category Content Plugin
Classifications
CWE-79, T1189
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 22, 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

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=versions prior to version 1.0.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

EC-CUBE CO.,LTD. · EC-CUBE Category Content Pluginversion=versions prior to version 1.0.1

Published CVSS scores

6.1NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
2.6JPCERT/CC JVNAV:N/AC:H/Au:N/C:N/I:P/A:N
4.3NIST NVDAV:N/AC:M/Au:N/C:N/I:P/A:N
6.1JPCERT/CC JVNCVSS:3.0/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 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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