CVE-2021-20734Public exploitNetwork attack vector

Administrator-browser script execution via unsanitized order identifier

Published Jun 22, 2021 · Updated Aug 3, 2024

Cross-site scripting in Welcart e-Commerce before 2.2.4 allows remote attackers to execute arbitrary script in an administrator's browser. The administrative order-editing page outputs the order_id query parameter without validation or contextual escaping. Exploitation requires a signed-in administrator to visit a crafted URL, and script execution remains confined to that browser context.

CVSS severity6.1
Medium
EPSS probability1.04%
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 Welcart e-Commerce before 2.2.4 allows remote attackers to execute arbitrary script in an administrator's browser. The administrative order-editing page outputs the order_id query parameter without validation or contextual escaping. Exploitation requires a signed-in administrator to visit a crafted URL, and script execution remains confined to that browser context.

The record

CVE
CVE-2021-20734
Published
Jun 22, 2021
Updated
Aug 3, 2024
Vendor
Welcart Inc.
Product
Welcart e-Commerce
Classifications
CWE-79, T1203
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

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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=versions prior to 2.2.4

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Welcart Inc. · Welcart e-Commerceversion=versions prior to 2.2.4

Published CVSS scores

6.1JPCERT/CCCVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
4.3JPCERT/CCAV:N/AC:M/Au:N/C:N/I:P/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')
T1203Exploitation for Client Execution

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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