CVE-2021-39348Public exploitNetwork attack vector

Stored XSS via unescaped custom profile fields

Published Oct 21, 2021 · Updated Feb 14, 2025

Stored XSS in LearnPress 4.1.3.1 and earlier allows remote authenticated users with administrator access to inject scripts via custom profile fields. The backend-user-profile.php view outputs the custom_profile value without sufficient escaping, causing supplied markup to persist and execute in the site context. Exposure requires administrator access and a multisite installation or another configuration that disables unfiltered_html; execution can read or alter browser-accessible data.

CVSS severity5.5
Medium
EPSS probability5.20%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored XSS in LearnPress 4.1.3.1 and earlier allows remote authenticated users with administrator access to inject scripts via custom profile fields. The backend-user-profile.php view outputs the custom_profile value without sufficient escaping, causing supplied markup to persist and execute in the site context. Exposure requires administrator access and a multisite installation or another configuration that disables unfiltered_html; execution can read or alter browser-accessible data.

The record

CVE
CVE-2021-39348
Published
Oct 21, 2021
Updated
Feb 14, 2025
Vendor
Overdrive Eletrônica
Product
LearnPress
Classifications
CWE-79, CWE-80, T1059.007
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Oct 21, 2021CVE publishedPublication date reported by the CVE source.
  2. Feb 14, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=4.1.3.1 <=4.1.3.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

Overdrive Eletrônica · LearnPressversion=4.1.3.1 <=4.1.3.1

Published CVSS scores

5.5WordfenceCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:L/I:L/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesadmin
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CWE-80Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS)
T1059.007JavaScript/JScript

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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