CVE-2025-54476 Joomla! Core - [20250901] Inadequate content filtering within the checkAttribute filter code
An XSS vulnerability in Joomla's input filter allows attackers to inject malicious scripts, potentially leading to code execution or account takeover.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2025-54476?
CVE-2025-54476 is a medium-severity cross-site scripting vulnerability in Joomla! CMS, published on 30 Sep 2025. An attacker needs administrator access to exploit it, and only if a user opens a file or follows a link.
Official description
Improper handling of input could lead to an XSS vector in the checkAttribute method of the input filter framework class.
Weakness: CWE-79
Which versions are affected by CVE-2025-54476?
6 open source packages ship an affected version, including joomla/filter.
| Package | Affected | Fixed in |
|---|---|---|
joomla/filter Packagist | All versions | 2.0.6 |
joomla/filter Packagist | All versions | 2.0.6 |
joomla/filter Packagist | From 3.0.0 | 3.0.5 |
joomla/filter Packagist | From 3.0.0 | 3.0.5 |
joomla/filter Packagist | From 4.0.0 | 4.0.1 |
joomla/filter Packagist | From 4.0.0 | 4.0.1 |
How do I fix CVE-2025-54476?
Upgrade joomla/filter to a fixed version for your release line: 2.0.6, 3.0.5 or 4.0.1.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2025-54476 being exploited?
There is no known exploitation of CVE-2025-54476 in the wild and no public exploit code.
Sources
Also known as GHSA-fm22-g2q9-j3pw, MINI-v7mm-wxm2-wc7v.