Which products and versions are affected by CVE-2021-23124?

Affected: Joomla\!; joomla (bitnami) versions >= 3.9.0; Joomla! CMS versions >= 3.9.0-3.9.23. The full list is in the CVE brief.

Is CVE-2021-23124 being exploited in the wild?

It is not listed in any known-exploited vulnerabilities catalog.

Is CVE-2021-23124 in the CISA KEV catalog?

No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.

Is there a public exploit for CVE-2021-23124?

No public exploit code is known.

Is there a fix for CVE-2021-23124?

Fixed versions are available, including Joomla\! <=3.9.23, Joomla\! 3.9.23.

How urgently should CVE-2021-23124 be patched?

Brandefense priority: patch immediately, because it is very likely to be exploited soon.

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Vulnerability Intelligence

CVE-2021-23124

Q: What is CVE-2021-23124?

An issue was discovered in Joomla!

Q: How urgently should CVE-2021-23124 be patched?

Brandefense priority: patch immediately, because it is very likely to be exploited soon.

Medium

3.9.0 through 3.9.23.

Published Jan 12, 2021 · Updated Sep 8, 2026 · Also known as BIT-joomla-2021-23124

Key Facts

Patch immediately

CVE-2021-23124 is a medium-severity vulnerability (CVSS 6.1 v3.1) affecting Joomla\!, joomla (bitnami), Joomla! CMS.
It is not listed in any known-exploited vulnerabilities catalog. No public exploit code is known.
EPSS estimates a 79% probability of exploitation in the next 30 days.
Fixed versions are available, including Joomla\! <=3.9.23, Joomla\! 3.9.23.
Brandefense priority: patch immediately, because it is very likely to be exploited soon.

CVSS v3.1

6.1

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

EPSS (30-day exploit likelihood)

79%

Higher than 99.5% of all scored CVEs

Exploited in the wild

No known

Not in a known-exploited catalog

Public exploit code

None known

Get the full CVE-2021-23124 brief as a PDF

Every affected product and fixed release, exploitation status and a first 24 hours response checklist, emailed within minutes.

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.

Affected Products

3 affected entries in total

Product	Affected versions	Fixed in
Joomla\!Joomla	See advisory	3.9.23
joomlabitnami	>= 3.9.0	n/a
Joomla! CMS	>= 3.9.0-3.9.23	n/a

Patched Releases

Joomla\!

<=3.9.23

Timeline

Publicly disclosed
Jan 12, 2021
Last updated
Sep 8, 2026

Weakness Type

CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

References

FAQ

Common Questions.

An issue was discovered in Joomla!
Affected: Joomla\!; joomla (bitnami) versions >= 3.9.0; Joomla! CMS versions >= 3.9.0-3.9.23. The full list is in the CVE brief.
It is not listed in any known-exploited vulnerabilities catalog.
No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.
No public exploit code is known.
Fixed versions are available, including Joomla\! <=3.9.23, Joomla\! 3.9.23.
Brandefense priority: patch immediately, because it is very likely to be exploited soon.

Is CVE-2021-23124 Running On Your Attack Surface?

Brandefense maps vulnerabilities like this one to your internet-facing assets and tells you exactly where to patch.

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