CVE-2026-54390

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

State: Published
Severity: 9.3 Critical
Published: Jun 18, 2026
Updated: Oct 29, 2026
Reserved: Jun 12, 2026

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.

Scores

CVSS	Score	Vector	Source
4.0	9.3 Critical	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	VulnCheck
3.1	9.8 Critical	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H	VulnCheck

Weaknesses

CWE-1336 Improper Neutralization of Special Elements Used in a Template Engine

Affected Products

Product	Versions
JTL ShopJTL Software	5.0.0 through 5.1.8Not affected 5.2.0 to before 5.4.0Affected 5.4.0 to before 5.5.4Affected 5.6.0 to before 5.6.2Affected 5.7.0 to before 5.7.2Affected 5.5.4Not affected 5.6.2Not affected 5.7.2Not affected

References

https://sansec.io/research/jtl-shop-ssti-rcetechnical-description
https://forum.jtl-software.de/threads/jtl-shop-5-7-aktuell-5-7-2.246278/release-notespatch
https://www.vulncheck.com/advisories/jtl-shop-server-side-template-injection-via-smarty-rendererthird-party-advisory

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