Cross-site scripting in Joomla! - CVE-2026-90918
Published: September 30, 2026
Vulnerability identifier: #VU152886
CSH Severity: Medium
CVSS v4: 5.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N]
CVE-ID: CVE-2026-90918
CWE-ID: CWE-79
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to execute arbitrary script in a victim's browser.
The vulnerability exists due to improper neutralization of input in the mail template feature when generating HTML email content. A remote attacker can inject crafted script content into affected mail templates to execute arbitrary script in a victim's browser.
The issue affects multiple extensions.
Affected software
Joomla!
How to mitigate CVE-2026-90918
Install security update from vendor's website.
Joomla! - addressed in versions 5.4.9, 6.1.4