by Kastro
Paper/Archive/CVE-2026-54390

CVE-2026-54390

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

EPSS 0.6%CVSS 9.8
critical.is priorityof 100
39
CVSS 9.8 (CNA)9.8 / 10 × 3029.4Not in CISA KEV+300.0EPSS percentile 48.8.488 × 209.8No public exploit+100.0SSVC exploitation: none+100.0
Description · from the CVE record

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

ProductAffectedFixed inSource
JTL Shop5.2.0 – < 5.4.05.4.0CNA
JTL Shop5.4.0 – < 5.5.45.5.4CNA
JTL Shop5.6.0 – < 5.6.25.6.2CNA
JTL Shop5.7.0 – < 5.7.25.7.2CNA

Scores by source

VulnCheck (CNA)9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
VulnCheck (CNA)9.3CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
CISA ADPSSVCExploitation: none · Automatable: yes · Technical impact: total

References

writeupsansec.io/research/jtl-shop-ssti-rcepatchforum.jtl-software.de/threads/jtl-shop-5-7-aktuell-5-7-2.246278writeupvulncheck.com/advisories/jtl-shop-server-side-template-injection-via-smarty-renderer