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.
Metrics
Affected Vendors & Products
References
| Link | Providers |
|---|---|
| https://typo3.org/security/advisory/typo3-ext-sa-2026-022 |
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History
Tue, 25 Aug 2026 15:30:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Metrics |
ssvc
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Tue, 25 Aug 2026 09:15:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| 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. | |
| Title | Server-Side Template Injection in extension "powermail" (powermail) | |
| Weaknesses | CWE-1336 | |
| References |
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| Metrics |
cvssV4_0
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Status: PUBLISHED
Assigner: TYPO3
Published:
Updated: 2026-08-25T14:07:07.220Z
Reserved: 2026-08-20T13:10:12.063Z
Link: CVE-2026-77136
Updated: 2026-08-25T14:07:01.389Z
Status : Received
Published: 2026-08-25T09:17:34.187
Modified: 2026-08-25T14:16:54.297
Link: CVE-2026-77136
No data.
OpenCVE Enrichment
Updated: 2026-08-25T10:45:03Z