CVE-2021-20717

MEDIUM

EC-CUBE 4.0.0-4.0.5 - Stored Cross-Site Scripting in Administrator Input Field

Title source: llm
STIX 2.1

Exploitation Summary

EIP tracks 1 public exploit for CVE-2021-20717. PoCs published by s-index.

AI-analyzed exploit summary This repository provides a detailed technical writeup for CVE-2021-20717, an XSS vulnerability in EC-CUBE 4.0.0 to 4.0.5. It includes setup instructions, reproduction steps, and references to the fixed commit, demonstrating a clear understanding of the vulnerability.

Description

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.

Exploits (1)

nomisec WRITEUP 1 stars
by s-index · poc
https://github.com/s-index/CVE-2021-20717

This repository provides a detailed technical writeup for CVE-2021-20717, an XSS vulnerability in EC-CUBE 4.0.0 to 4.0.5. It includes setup instructions, reproduction steps, and references to the fixed commit, demonstrating a clear understanding of the vulnerability.

Classification
Writeup 90%
Attack Type
Xss
Complexity
Moderate
Reliability
Reliable
Target: EC-CUBE 4.0.0 to 4.0.5
Auth required
Prerequisites: Access to the EC-CUBE web application · Ability to inject malicious script into the inquiry form · Admin credentials to trigger the XSS payload
MITRE ATT&CK
devstral-2 · analyzed Feb 18, 2026 Full analysis →

References (3)

Core 3
Core References
Patch, Vendor Advisory x_refsource_misc
https://www.ec-cube.net/news/detail.php?news_id=384
Patch, Vendor Advisory x_refsource_misc
https://www.ec-cube.net/news/detail.php?news_id=383
Third Party Advisory x_refsource_misc
https://jvn.jp/en/jp/JVN97554111/index.html

Scores

CVSS v3 6.1
EPSS 0.0137
EPSS Percentile 80.7%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Details

CWE
CWE-79
Status published
Products (2)
ec-cube/ec-cube 4.0.0Packagist
ec-cube/ec-cube 4.0.0 - 4.0.5
Published May 10, 2021
Tracked Since Feb 18, 2026