CVE-2026-9558
Critical · CVSS 9.9- CVSS
- 9.9
- nvd
- EPSS
- 0.44%
- 36th pct
- KEV
- No
- Class
- oss containerizable
- CWE-1336
Description
A Server-Side Template Injection (SSTI) vulnerability exists in Mautic's theme engine. The platform renders uploaded Twig templates without a sandbox or strict function restrictions. Authenticated users with permissions to create or upload themes can abuse this to execute arbitrary code on the hosting server (Remote Code Execution) or access restricted system files and configuration settings.
Affected packages
| Packagist | mautic/core | 1.3.0 → ∞ |
| Packagist | mautic/core | 5.0.0 → 5.2.11 |
| Packagist | mautic/core | 6.0.0 → 6.0.9 |
| Packagist | mautic/core | 7.0.0 → 7.1.2 |
References
Status: profiled · ingested 2026-07-21T18:00:18.000Z