Description
The HTML content of mails and tracked URLs are rendered unescaped in the backend module. Backend users with access to the mail module can inject arbitrary HTML and JavaScript, which is executed in the context of other backend users viewing the mail preview or report.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| TYPO3 | Extension "Mail" | 4.0.0 – < 4.2.0, < 3.12.5 | 4.2.0 |
Advisories 1
- WID-SEC-2026-4322 TYPO3 Extension (Mail): Mehrere Schwachstellen BSI CERT-Bund (WID) · Nov 3, 2026
References
- https://typo3.org/security/advisory/typo3-ext-sa-2026-037 vendor-advisory