CVE-2026-54390

CRITICAL EPSS 25.2%
Published Jun 18, 20262w ago · Modified Jun 23, 20261w ago
9.3 CVSS 4.0
Critical
Find Similar
Published Jun 18, 2026 2w ago
Last Modified Jun 23, 2026 1w ago

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.

CVSS Details

Base Score
9.3
Exploitability
—
Impact
—
Vector string
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction None
Scope X

Threat Intelligence

EPSS Exploit Probability
25.2% percentile
Exploit & Patch Status
No Known Exploit
No Patch Available

Weaknesses 1

CWE-1336

References 3

  • forum.jtl-software.de https://forum.jtl-software.de/threads/jtl-shop-5-7-aktuell-5-7-2.246278/
  • sansec.io https://sansec.io/research/jtl-shop-ssti-rce
  • vulncheck.com https://www.vulncheck.com/advisories/jtl-shop-server-side-template-injection-via-smarty-renderer

Remediation

No remediation data recorded yet

Check vendor advisories and the NVD entry for patch availability.