Improper Neutralization of Special Elements Used in a Template Engine in Powermail - CVE-2026-77136
Published: August 26, 2026
Vulnerability identifier: #VU145657
CSH Severity: High
CVSS v4: 9.2 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-77136
CWE-ID: CWE-1336
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to compromise the target system.
The vulnerability exists due to improper neutralization of special elements used in a template engine. A remote user can submit Fluid template syntax to execute arbitrary Fluid ViewHelpers and disclose the server configuration, leading to arbitrary code execution.
Affected software
Powermail
How to mitigate CVE-2026-77136
Install updates from vendor's website.
Powermail - addressed in versions 10.9.3, 12.6.1, 13.2.1