---
title: "CVE-2021-23124: [20210102] - Core - XSS… | CubePath"
description: "An issue was discovered in Joomla! 3.9.0 through 3.9.23. The lack of escaping in mod_breadcrumbs aria-label attribute allows XSS attacks."
language: en
source: https://cubepath.com/security/cve/CVE-2021-23124
---

# CVE-2021-23124: [20210102] - Core - XSS… | CubePath

## Description

An issue was discovered in Joomla! 3.9.0 through 3.9.23\. The lack of escaping in mod\_breadcrumbs aria-label attribute allows XSS attacks.

Official description from the CVE record, published by Joomla. Copyright © 1999-2026 The MITRE Corporation. See [/security/cve/legal](https://cubepath.com/security/cve/legal) for the CVE license. [View the record on cve.org](https://www.cve.org/CVERecord?id=CVE-2021-23124)

## Key data

### EPSS

Exploit Prediction Scoring System by FIRST: an estimate of the probability that exploitation activity will be observed in the next 30 days.

Score

0.78960 (79.0% probability)

Percentile

99.6%

Scores of

Nov 10, 2026

Model

v2026.06.15

## Affected products

Products listed in the CVE record, as the CNA published them.

- Joomla! CMS

  - affected: 3.9.0-3.9.23

## References

Links listed in the CVE record. They lead to other sites, which CubePath does not control.

- [developer.joomla.org/security-centre/837-20210102-core-xss-…](https://developer.joomla.org/security-centre/837-20210102-core-xss-in-mod-breadcrumbs-aria-label-attribute.html) vendor-advisory

## Timeline

1. ID reserved Jan 6, 2021
2. Record published Jan 12, 2021
3. Record last updated Feb 25, 2026

## Look up another CVE

## About CubePath

CubePath is a cloud provider with data centers in Europe and the United States. It offers VPS, bare metal servers and DDoS protection.

[Cloud VPS](https://cubepath.com/vps) [DDoS protection](https://cubepath.com/ddos-protection)

Data from the CVE Program (MITRE), CISA KEV and FIRST EPSS. CVSS is owned by FIRST and used by permission. Not affiliated with or endorsed by MITRE, CISA or FIRST. Data as of Nov 10, 2026, 20:03 UTC. [Sources and licenses](https://cubepath.com/security/cve/legal)