Description
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.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| JTL Software | JTL Shop | 5.2.0 – < 5.4.0, 5.4.0 – < 5.5.4, 5.6.0 – < 5.6.2, 5.7.0 – < 5.7.2 | 5.0.0 |
Public exploits
Exploit or proof-of-concept code for this vulnerability is publicly available, which lowers the bar for attackers. Treat it as a reason to patch sooner.
GitHub 1 repository
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shinthink/CVE-2026-54390 ★ 0 · Jul 10, 2026
CVE-2026-54390 — JTL Shop Smarty SSTI RCE | Pre-Auth Template Injection via fetch('string:' . ) | 5.2.0-5.7.1
Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.
References
- https://sansec.io/research/jtl-shop-ssti-rce technical-description
- https://forum.jtl-software.de/threads/jtl-shop-5-7-aktuell-5-7-2.246278/ release-notes patch
- https://www.vulncheck.com/advisories/jtl-shop-server-side-template-injection-via-smarty-renderer third-party-advisory