Server-Side Template Injection in extension "powermail" (powermail) (CVE-2026-77136) | HOL Guard CVE

Unknown severity · Source severity not reportedCVE-2026-77136

Server-Side Template Injection in extension "powermail" (powermail)

Answer in brief

CVE-2026-77136 records a Unknown severity vulnerability in Server-Side Template Injection in extension "powermail" (powermail). The current sources do not mark it as known exploited. The current feed maps TYPO3/Extension "powermail" (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Aug 25, 2026Updated Aug 25, 2026Source checked Aug 25, 2026First seen by HOL Aug 25, 2026Material review Aug 25, 2026

Upstream Advisory

Key facts

Risk: Unknown severitySource severity not reported
Exploitation: Not marked as known exploited
Affected software: 1 mapped package or product
Fix availability: Available

Why this deserves its current priority

A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps TYPO3/Extension "powermail" (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
TYPO3/Extension "powermail"generic	>=13.0.0 <13.2.1 \|\| >=11.0.0 <12.6.1 \|\| >=0 <10.9.3	13.2.1, 12.6.1, 10.9.3

Recommended response

Check inventory. Check lockfiles and deployed manifests for TYPO3/Extension "powermail".
Review the reported fix. Update TYPO3/Extension "powermail" to 13.2.1 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Aug 25, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Aug 25, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Aug 25, 2026

Sources and claim methodology

Source referencetypo3.org

Upstream source 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.

Quoted source text, attributed separately from HOL analysis.