CVE-2026-77136 (GCVE-0-2026-77136)

Vulnerability from cvelistv5 – Published: 2026-08-25 09:00 – Updated: 2026-08-25 14:07
VLAI Previdian
Title
Server-Side Template Injection in extension "powermail" (powermail)
Summary
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.
Severity
9.5 (Critical)
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-25 14:06 UTC
CWE
  • CWE-1336 - Improper Neutralization of Special Elements Used in a Template Engine
Assigner
TYPO3 CNA under the mitre root
CNA scorecard B 84/100 over 53 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
TYPO3 Extension "powermail" Affected: 13.0.0 , < 13.2.1 (semver)
Affected: 11.0.0 , < 12.6.1 (semver)
Affected: 0 , < 10.9.3 (semver)
guessed Create a notification for this product.
Date Public
2026-08-25 09:00
Credits
Antariksha Sharma Rémi Payette Office québécois de la langue française (OQLF) Centre gouvernemental de Cyberdéfense (CGCD) Marcus Schwemer
Previdian
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: d3aa545a-8cc9-4ab9-ae34-0e0749d1fd37

Vulnerability ID: CVE-2026-77136

Status: Confirmed

Status Updated: 2026-08-25 09:10 UTC

Exploited: Yes

Timestamps
First Seen: 2026-08-25
Asserted: 2026-08-25
Scope
Notes: Server-Side Template Injection in extension "powermail" (powermail) | Affected: TYPO3 / Extension "powermail" | CVSS: 9.5 (CRITICAL) | EPSS: 0.00554 | Used in malware: unknown | Not yet in CISA KEV: True
Evidence

Type: Public Report

Signal: Successful Exploitation

Confidence: 70%

Source: previdian

Details
Feed Previdian (previdian.com)
Title Server-Side Template Injection in extension "powermail" (powermail)
Vendor TYPO3
Product Extension "powermail"
Added Date 2026-08-25T09:10:43.436Z
Cvss Score 9.5
Epss Score 0.00554
Cvss Severity CRITICAL
Epss Percentile 0.4378
Used In Malware unknown
Ahead Of Cisa Kev None
Not Yet In Cisa Kev True
References
Created: 2026-08-26 10:00 UTC | Updated: 2026-08-26 10:00 UTC
Show details on NVD website
To clipboard 

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