- Sonar’s Vulnerability Research Team has discovered an issue that led to multiple XSS vulnerabilities in the popular Content Management System Joomla.
- The issue discovered with the help of SonarCloud affects Joomla’s core filter component and is tracked as CVE-2024-21726.
- Attackers can leverage the issue to gain remote code execution by tricking an administrator into clicking on a malicious link.
- The underlying PHP bug is an inconsistency in how PHP’s mbstring functions handle invalid multibyte sequences.
- The bug was fixed with PHP versions 8.3 and 8.4, but not backported to older PHP versions.
- Joomla released a security announcement and published version 5.0.3/4.4.3, which mitigates the vulnerability.
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