CVE-2020-20391

Name: CVE-2020-20391
Creator: NVD / NIST
Published: 2021-06-23T15:15:08.487+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.4/10EPSS 0.58%

Last modified Jun 17, 2026

CVE-2020-20391 is a medium-severity vulnerability rated 5.4/10 on the CVSS scale. Cross Site Scripting vulnerability in GetSimpleCMS 3.4.0a in admin/snippets.php via (1) Add Snippet and (2) Save snippets.. EPSS estimates a 0.58% chance of exploitation in the next 30 days.

Description

Cross Site Scripting vulnerability in GetSimpleCMS 3.4.0a in admin/snippets.php via (1) Add Snippet and (2) Save snippets.

Metrics

CVSS 3.1

5.4/10

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

EPSS Probability

0.58%

43.3th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-79

Affected Software

Vendor	Product	Versions	Update
Get-Simple	Getsimplecms	3.4.0	A1

References

https://github.com/GetSimpleCMS/GetSimpleCMS/issues/1322Exploit, Third Party Advisory
https://github.com/GetSimpleCMS/GetSimpleCMS/issues/1322Exploit, Third Party Advisory

Timeline

Published: Jun 23, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-20391?

Cross Site Scripting vulnerability in GetSimpleCMS 3.4.0a in admin/snippets.php via (1) Add Snippet and (2) Save snippets.

How severe is CVE-2020-20391?

CVE-2020-20391 has a CVSS score of 5.4/10 (MEDIUM severity). The EPSS model estimates a 0.58% probability of exploitation in the next 30 days.

How do I fix CVE-2020-20391?

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-2020-20391?

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

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Source: NVD / NIST