TI-2026-53879 Aliases CVE-2026-77136 GHSA-6956-f2gq-2c74

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

MEDIUM 45CWE-1336Published 2026-08-25 · Updated 2026-08-25

Key facts

Attack vector: Network
Privileges required: None
User interaction: None
Attack complexity: Low
Attack requirements: Present
Impact type: Code execution
Confidentiality · integrity · availability: High · High · High
Fix status: Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-1336.

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00968 62nd percentileScored 2026-11-07

Fix Fixed Extension "powermail" (TYPO3): 13.2.1, 12.6.1, 10.9.3

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: No
Technical impact: Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
TYPO3	Extension "powermail"	13.0.0 to before 13.2.1; 11.0.0 to before 12.6.1; before 10.9.3	13.2.1, 12.6.1, 10.9.3	Patch available	CNA

Extension "powermail" VendorTYPO3 Affected 13.0.0 to before 13.2.1; 11.0.0 to before 12.6.1; before 10.9.3 Fixed in 13.2.1, 12.6.1, 10.9.3 Patch available CNA

Remediation

Fix · CNA Extension "powermail" (TYPO3) Fixed in 13.2.1, 12.6.1, 10.9.3

Timeline

2026-10-02 Threatist record created from CVE-2026-77136
2026-10-03 Alias added: GHSA-6956-f2gq-2c74

References

Advisory 1

https://typo3.org/security/advisory/typo3-ext-sa-2026-022

TI-2023-10314 Persisted Cross-Site Scripting in Frontend Rendering in typo3 CVSS 3.1HIGH 8.8
TI-2010-03538 The jumpUrl (aka access tracking) implementation in tslib/class.tslib_fe.php in TYPO3… CVSS 2.0HIGH 7.1
TI-2009-00775 The jumpUrl mechanism in class.tslib_fe.php in TYPO3 3.3.x through 3.8.x, 4.0 before… CVSS 2.0MEDIUM 5.0
TI-2025-30547 The sr_feuser_register extension through 12.4.8 for TYPO3 allows Remote Code Execution. CVSS 3.1CRITICAL 10.0
TI-2019-08867 The PharStreamWrapper (aka phar-stream-wrapper) package 2.x before 2.1.1 and 3.x before… CVSS 3.1CRITICAL 9.8
TI-2008-04019 Unspecified vulnerability in the TYPO3 Secure Directory (kw_secdir) extension before… CVSS 2.0HIGH 10.0

See all 411 →

Sources

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