CVE-2026-54390CWE-1336

JTL Shop < 5.7.2 Server-Side Template Injection via Smarty Renderer

Critical · published June 18, 2026

CVSS v4.0
9.3
EPSS
1%
Percentile
48.3
In the wild
Unconfirmed
What it is

JTL Shop versions 5.2.0 through 5.7.1 contains a server-side template injection vulnerability that allows unauthenticated attackers to inject malicious template syntax due to unsanitized user-supplied input passed to the Smarty template engine. Attackers can exploit this flaw to read sensitive server-side values such as database credentials and encryption keys, and on versions 5.4.0 through 5.7.1, leverage registered Smarty modifiers including unserialize and file_get_contents to write a webshell to the web root and execute arbitrary commands as the web server user.

The record
Technical detail
CVSS v4.0
9.3 · CRITICAL
Vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
EPSS
0.00604 · 48.3th percentile
Weakness
CWE-1336 · Improper Neutralization of Special Elements Used in a Template Engine
Published
2026-06-18T17:33Z
EPSS history
Timeline
  • 18 JUN 17:33Z
    JTL Shop < 5.7.2 Server-Side Template Injection via Smarty Renderer
    cvelistv5