CVE-2021-39348

Name: CVE-2021-39348
Creator: NVD / NIST
Published: 2021-10-21T20:15:07.997+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 4.8/10EPSS 5.04%

Last modified Jun 17, 2026

CVE-2021-39348 is a medium-severity vulnerability rated 4.8/10 on the CVSS scale. The LearnPress WordPress plugin is vulnerable to Stored Cross-Site Scripting due to insufficient escaping on the $custom_profile parameter found in the ~/inc/admin/views/backend-user-profile.php file which allowed attackers with administrative user access to inject arbitrary web scripts, in versions up to and including 4.1.3.1. This affects multi-site installations where unfiltered_html is disabled for administrators, and sites where unfiltered_html is disabled. EPSS estimates a 5.04% chance of exploitation in the next 30 days.

Description

The LearnPress WordPress plugin is vulnerable to Stored Cross-Site Scripting due to insufficient escaping on the $custom_profile parameter found in the ~/inc/admin/views/backend-user-profile.php file which allowed attackers with administrative user access to inject arbitrary web scripts, in versions up to and including 4.1.3.1. This affects multi-site installations where unfiltered_html is disabled for administrators, and sites where unfiltered_html is disabled. Please note that this is seperate from CVE-2021-24702.

Metrics

CVSS 3.1

4.8/10

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

EPSS Probability

5.04%

91.2th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Thimpress	Learnpress	<= 4.1.3.1

References

https://github.com/BigTiger2020/word-press/blob/main/LearnPress.mdExploit, Third Party Advisory
https://plugins.trac.wordpress.org/changeset?sfp_email=&sfph_mail=&reponame=&old=2614592%40learnpress&new=2614592%40learnpress&sfp_email=&sfph_mail=Patch, Third Party Advisory
https://wordfence.com/vulnerability-advisories/#CVE-2021-39348Third Party Advisory
https://github.com/BigTiger2020/word-press/blob/main/LearnPress.mdExploit, Third Party Advisory
https://plugins.trac.wordpress.org/changeset?sfp_email=&sfph_mail=&reponame=&old=2614592%40learnpress&new=2614592%40learnpress&sfp_email=&sfph_mail=Patch, Third Party Advisory
https://wordfence.com/vulnerability-advisories/#CVE-2021-39348Third Party Advisory

Timeline

Published: Oct 21, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-39348?

How severe is CVE-2021-39348?

CVE-2021-39348 has a CVSS score of 4.8/10 (MEDIUM severity). The EPSS model estimates a 5.04% probability of exploitation in the next 30 days.

How do I fix CVE-2021-39348?

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-2021-39348?

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

Scan your code now

Source: NVD / NIST