CVE-2021-39343Public exploitNetwork attack vector

Administrator-level stored XSS via unsanitized metadata fields

Published Oct 19, 2021 · Updated Feb 14, 2025

Stored XSS in Ferran Figueredo MPL-Publisher 1.30.2 and earlier allows remote authenticated users to execute scripts in the WordPress origin. PublisherController.php stores the Language and Publisher Name values without adequate validation or sanitization, then renders an injected event handler as active markup. Administrator access is required, and exposure is limited to sites where unfiltered_html is disabled, including multisite installations.

CVSS severity5.5
Medium
EPSS probability1.04%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Stored XSS in Ferran Figueredo MPL-Publisher 1.30.2 and earlier allows remote authenticated users to execute scripts in the WordPress origin. PublisherController.php stores the Language and Publisher Name values without adequate validation or sanitization, then renders an injected event handler as active markup. Administrator access is required, and exposure is limited to sites where unfiltered_html is disabled, including multisite installations.

The record

CVE
CVE-2021-39343
Published
Oct 19, 2021
Updated
Feb 14, 2025
Vendor
Ferran Figueredo
Product
MPL-Publisher
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Oct 19, 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

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=1.30.2 <=1.30.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

Ferran Figueredo · MPL-Publisherversion=1.30.2 <=1.30.2

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')
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

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo