What’s Vulnerable › Vulnerabilities

CVE-2021-23129: [20210303] - Core - XSS within alert messages showed to users

Severity: medium (CVSS 6.1 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.8% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2021-03-04 · updated 2026-06-17
Weakness: CWE-79

Description

An issue was discovered in Joomla! 2.5.0 through 3.9.24. Missing filtering of messages showed to users that could lead to xss issues.

Affected products

Joomla!: from 2.5.0 before 3.9.25 — fixed in 3.9.25

How to fix

Upgrade to a fixed version: Joomla! 3.9.25. Check the vendor advisory for mitigations.

References

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