SB2025100110 - Multiple vulnerabilities in Joomla!

Description

This security bulletin contains information about 2 secuirty vulnerabilities.

1) Cross-site scripting (CVE-ID: CVE-2025-54476)

The disclosed vulnerability allows a remote attacker to perform cross-site scripting (XSS) attacks.

The vulnerability exists due to insufficient sanitization of user-supplied data in the checkAttribute method of the input filter framework class. A remote attacker can trick the victim to follow a specially crafted link and execute arbitrary HTML and script code in user's browser in context of vulnerable website.

Successful exploitation of this vulnerability may allow a remote attacker to steal potentially sensitive information, change appearance of the web page, perform phishing and drive-by-download attacks.

2) Observable discrepancy (CVE-ID: CVE-2025-54477)

The vulnerability allows a remote attacker to gain access to potentially sensitive information.

The vulnerability exists due to improper handling of authentication requests. A remote attacker can cause user enumeration in the passkey authentication method

Remediation

Install update from vendor's website.

References

• https://developer.joomla.org/security-centre/1010-20250901-core-inadequate-content-filtering-within-the-checkattribute-filter-code.html
• https://developer.joomla.org/security-centre/1011-20250902-core-user-enumeration-in-passkey-authentication-method.html