CVE-2026-54390 JTL Shop < 5.7.2 Server-Side Template Injection via Smarty Renderer
Unauthenticated attackers can inject template syntax to read sensitive data or execute arbitrary commands via webshell upload in JTL Shop.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-54390?
CVE-2026-54390 is a critical code injection vulnerability in JTL Shop, published on 18 Jun 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Weakness: CWE-1336
Which versions are affected by CVE-2026-54390?
How do I fix CVE-2026-54390?
No fix has been published for CVE-2026-54390 yet. Limit exposure of the affected software until one is available.
Upgrade, and never evaluate templates, expressions or code built from user input. More about Code injection.
Is CVE-2026-54390 being exploited?
There is no known exploitation of CVE-2026-54390 in the wild and no public exploit code.
Public exploit code: 1 proofs of concept on GitHub.
Sources
Also known as GHSA-pxq6-fr5m-fwh5.