PT-2026-50772 · Jtl · Jtl-Shop

Sansec · Published 2026-06-18 · Updated 2026-06-18 · CVE-2026-54390

Mitre

CVSS v3.1

9.8

Critical

Base vector

AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

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.

Fix

Weakness Enumeration

CWE-1336

Related Identifiers

CVE-2026-54390

Affected Products

Jtl-Shop

References · 4

• https://forum.jtl-software.de/threads/jtl-shop-5-7-aktuell-5-7-2.246278 · Patch
• https://nvd.nist.gov/vuln/detail/CVE-2026-54390 · Security Note
• https://vulncheck.com/advisories/jtl-shop-server-side-template-injection-via-smarty-renderer · Note
• https://sansec.io/research/jtl-shop-ssti-rce · Note