CVE-2020-20640

Name: CVE-2020-20640
Creator: NVD / NIST
Published: 2021-06-28T18:15:07.937+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.1/10EPSS 1.02%

Last modified Jun 17, 2026

CVE-2020-20640 is a medium-severity vulnerability rated 6.1/10 on the CVSS scale. Cross Site Scripting (XSS) vulnerability in ECShop 4.0 due to security filtering issues, in the user.php file, we can use the html entity encoding to bypass the security policy of the safety.php file, triggering the xss vulnerability.. EPSS estimates a 1.02% chance of exploitation in the next 30 days.

Description

Cross Site Scripting (XSS) vulnerability in ECShop 4.0 due to security filtering issues, in the user.php file, we can use the html entity encoding to bypass the security policy of the safety.php file, triggering the xss vulnerability.

Metrics

CVSS 3.1

6.1/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

EPSS Probability

1.02%

58.9th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-79

Affected Software

Vendor	Product	Versions
Shopex	Ecshop	4.0

References

https://www.jianshu.com/p/219755c047a1Exploit, Third Party Advisory
https://www.jianshu.com/p/219755c047a1Exploit, Third Party Advisory

Timeline

Published: Jun 28, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-20640?

How severe is CVE-2020-20640?

CVE-2020-20640 has a CVSS score of 6.1/10 (MEDIUM severity). The EPSS model estimates a 1.02% probability of exploitation in the next 30 days.

How do I fix CVE-2020-20640?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2020-20640?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST