What’s Vulnerable › Vulnerabilities
CVE-2026-77136: Server-Side Template Injection in extension "powermail" (powermail)
- Severity: critical (CVSS 9.5 v4.0)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 1.0% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2026-08-25 · updated 2026-09-28
- Weakness: CWE-1336
Description
The extension passes the raw value of a form field configured as "This field contains the name of the sender" directly into a Fluid View as template source, without any sanitization, and renders it. An anonymous, unauthenticated user can submit Fluid template syntax in that field to execute arbitrary Fluid ViewHelpers leading to disclosure of server configuration, environment variables and application source, and potentially remote code execution. Exploitation requires only that a form field is configured as the sender_name field, a common and default-adjacent Powermail configuration. No authentication or user interaction beyond a normal form submission is required. This vulnerability is reported to be actively exploited in the wild.
Affected products
- TYPO3 Extension "powermail": from 13.0.0 before 13.2.1; from 11.0.0 before 12.6.1; before 10.9.3 — fixed in 10.9.3, 12.6.1, 13.2.1
How to fix
Upgrade to a fixed version: TYPO3 Extension "powermail" 10.9.3, 12.6.1, 13.2.1. Check the vendor advisory for mitigations.
References
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