CVE-2026-54390
CriticalCVSS 9.8Exploitation Probability (EPSS)
Low risk49th percentile - higher than 49% of all known CVEs
Summary
JTL Shop versions 5.2.0 through 5.7.1 contain 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.
Risk Assessment
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.
Recommendation
It is recommended to update JTL Shop to the latest version to mitigate this vulnerability and implement appropriate input sanitization mechanisms.
Other vulnerabilities in JTL Shop
See all- CVE-2026-103904Critical
The public consent endpoint of JTL-Shop accepts arbitrary consent names from unauthenticated visitors without validating them against the configured consent items. These names are stored in the consent statistics and rendered without output encoding in the administration backend, allowing script code injection that executes in an administrator's browser session.
- CVE-2026-103905High
A vulnerability in JTL-Shop's authentication middleware processes the plugin safe mode toggle on the admin logout route before checking authentication. An unauthenticated attacker can toggle the safe mode, deactivating all plugins and causing a shop-wide denial of service.
Original NVD description (English source)
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.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS