SEPTEMBER 17, 2026
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Case File

CVE-2026-77136

CRITICAL · CVSS 9.5 EPSS 0.55% Public Exploit

Source: NVD + CISA KEV + EPSS · Published 2026-08-25 · Last synced 2026-09-17

CyberRota Analysis

AI-Generated

The vulnerability allows unauthenticated users to submit malicious Fluid template syntax through a form field designated for the sender's name, which is rendered without proper sanitization. This can lead to the disclosure of sensitive server information, environment variables, and application source code, with the potential for remote code execution. Organizations using Powermail with default configurations should prioritize immediate remediation, as this issue is actively being exploited in the wild.

Public Exploit Signal

A public exploit, PoC, GitHub repository or Metasploit reference was detected for this CVE.

Detected Signals
exploit remote code execution code execution

Note: these links are listed for security research and verification purposes only.

CVE
CVE-2026-77136
Severity
CRITICAL
CVSS
9.5
EPSS
0.55%

Original NVD 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.