Description
Content of external URL mails, their stylesheets and images to embed is fetched by the server without validating the target host. Backend users with access to the mail module can make the server send requests to hosts in the internal network.
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