CVE-2021-33851Public exploitNetwork attack vector

Stored XSS via unescaped custom logo link

Published Mar 9, 2022 · Updated Aug 4, 2024

Stored XSS in Apasionados Customize Login Image 3.4 allows remote authenticated users to execute JavaScript via a crafted logo link. The plugin stores the Custom logo link setting without adequate sanitization and renders it unescaped when the settings page opens. An account with manage-options rights must save the payload, and a user must open the plugin settings page, exposing that browser session to data access or modification.

CVSS severity5.4
Medium
EPSS probability1.32%
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 Apasionados Customize Login Image 3.4 allows remote authenticated users to execute JavaScript via a crafted logo link. The plugin stores the Custom logo link setting without adequate sanitization and renders it unescaped when the settings page opens. An account with manage-options rights must save the payload, and a user must open the plugin settings page, exposing that browser session to data access or modification.

The record

CVE
CVE-2021-33851
Published
Mar 9, 2022
Updated
Aug 4, 2024
Vendor
Apasionados del Marketing
Product
Customize Login Image
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 9, 2022CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 2024Record 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=Version 3.4

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Apasionados del Marketing · Customize Login Imageversion=Version 3.4

Published CVSS scores

3.5NVDAV:N/AC:M/Au:S/C:N/I:P/A:N
5.4NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:R/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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1059.007Command and Scripting Interpreter: JavaScript

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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