CVE-2021-20717

mediumpriority · track · 35EPSS 0.023 · 83 %ileexploit · PoCEUUS

grimoire priorityP1 · Urgent

Exploitable?

Public exploit

1 exploit · PoC

Likely / severe?

2.31% (83rd) EPSS

CVSS 4.3 · medium

Is it mine?

3 products

Check your exposure

Who says so?

4 sources

cnnvd · enisa_euvd · nvd · osv

EPSS · scored 2026-10-27

Cross-site scripting vulnerability in EC-CUBE 4.0.0 to 4.0.5 allows a remote attacker to inject a specially crafted script in the specific input field of the EC web site which is created using EC-CUBE. As a result, it may lead to an arbitrary script execution on the administrator's web browser.

cvss

Technical severity, 0–10. One row per scoring source.

6.1

010

base score 0–10 · higher = more severe · hover a vector to decode

v2.04.3mediumAV:N/AC:M/Au:N/C:N/I:P/A:Nprimary · NVD / NIST USexploitability 8.6 · impact 2.9

v3.16.1mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:Nprimary · NVD / NIST USexploitability 2.8 · impact 2.7

v3.16.1mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:Nsecondary · OSV

v3.15.8mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N/E:Psecondary · CVSS-BT (t0sche)

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-79USprimaryCWE-79US

exploits (1)

Public proof-of-concept and weaponised exploit code.

s-index/CVE-2021-20717CVE-2021-20717-EC-CUBE-XSSPoC · poc_in_github

affected products (3)

Products and version ranges known to be affected.

EC-CUBE CO.,LTD. EC-CUBE≤ 4.0.0 to 4.0.5enisa_euvdEU
ec-cube ec-cube4.0.0 → 4.0.5nvdUScpe:2.3:a:ec-cube:ec-cube:*:*:*:*:*:*:*:*
Packagist ec-cube/ec-cube4.0.0 → 4.0.5osvUSpkg:composer/ec-cube/ec-cube

advisories (1)

Vendor and ecosystem advisories describing this.

GHSA-c8mx-43cq-993wEC-CUBE Cross-site scripting vulnerability2022-05-24ghsa · osvUS
Cross-site scripting vulnerability in EC-CUBE 4.0.0 to 4.0.5 allows a remote attacker to inject a specially crafted script in the specific input field of the EC web site which is created using EC-CUBE. As a result, it may lead to an arbitrary script execution on the administrator's web browser.

also known as (3)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd nvd osv NVD CVE.org MITRE

published 2021-05-10modified 2026-06-17

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+53008 more

references (10)

External citations — patches, advisories, analysis.

scry

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