ZeroDay Findings
Sign inSign up

Findings

CVE-2026-90918

[20260908] - Core - XSS in HTML Mail Templates

Published Sep 25, 2026 · Joomla Joomla

Project: Joomla! SubProject: CMS Impact: Moderate Severity: Moderate Probability: Moderate Versions: 4.0.0-5.4.8,6.0.0-6.1.3 Exploit type: XSS Reported Date: 2026-08-24 Fixed Date: 2026-09-25 CVE Number: CVE-2026-90918 Description The mail template feature lacks an escaping mechanism, causing XSS vectors in multiple extensions. Affected Installs Joomla! CMS versions 4.0.0-5.4.8, 6.0.0-6.1.3 Solution Upgrade to version 5.4.9, 6.1.4 Contact The JSST at the Joomla! Security Centre . Reported By: Joe Grey / GitHub @StressTestor

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Sep 25, 2026 · Joomla Security

    Detected

    Project: Joomla! SubProject: CMS Impact: Moderate Severity: Moderate Probability: Moderate Versions: 4.0.0-5.4.8,6.0.0-6.1.3 Exploit type: XSS Reported Date: 2026-08-24 Fixed Date: 2026-09-25 CVE Number: CVE-2026-90918 Description The mail template feature lacks an escaping mechanism, causing XSS vectors in multiple extensions. Affected Installs Joomla! CMS versions 4.0.0-5.4.8, 6.0.0-6.1.3 Soluti

Sources

  • Joomla SecurityVendor advisoryCVE-2026-90918

    Project: Joomla! SubProject: CMS Impact: Moderate Severity: Moderate Probability: Moderate Versions: 4.0.0-5.4.8,6.0.0-6.1.3 Exploit type: XSS Reported Date: 2026-08-24 Fixed Date: 2026-09-25 CVE Number: CVE-2026-90918 Description The mail template feature lacks an escaping mecha

    developer.joomla.org