CVE-2026-54390
JTL Shop < 5.7.2 Server-Side Template Injection via Smarty Renderer
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.
INFO
Published Date :
June 18, 2026, 6:16 p.m.
Last Modified :
June 23, 2026, 1:16 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
Affected Products
The following products are affected by CVE-2026-54390
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
No affected product recoded yet
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | |||||
| CVSS 3.1 | CRITICAL | 83251b91-4cc7-4094-a5c7-464a1b83ea10 | ||||
| CVSS 3.1 | CRITICAL | MITRE-CVE | ||||
| CVSS 3.1 | CRITICAL | [email protected] | ||||
| CVSS 4.0 | CRITICAL | 83251b91-4cc7-4094-a5c7-464a1b83ea10 | ||||
| CVSS 4.0 | CRITICAL | [email protected] |
Solution
- Update JTL Shop to the latest version.
- Apply vendor patches for affected versions.
- Sanitize all user input processed by the template engine.
Public PoC/Exploit Available at Github
CVE-2026-54390 has a 1 public
PoC/Exploit available at Github.
Go to the Public Exploits tab to see the list.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-54390.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-54390 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-54390
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
CVE-2026-54390 — JTL Shop Smarty SSTI RCE | Pre-Auth Template Injection via fetch('string:' . ) | 5.2.0-5.7.1
cve exploit jtl-shop mass-scanner rce smarty ssti
Python
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-54390 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-54390 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
CVE Modified by [email protected]
Jun. 23, 2026
Action Type Old Value New Value Changed Affected [{'vendor': 'JTL Software', 'product': 'JTL Shop', 'versions': [{'status': 'unaffected', 'version': '5.0.0', 'versionType': 'semver', 'lessThanOrEqual': '5.1.8'}, {'status': 'affected', 'version': '5.2.0', 'versionType': 'custom', 'lessThanOrEqual': '5.3.x'}, {'status': 'affected', 'version': '5.4.0', 'versionType': 'semver', 'lessThanOrEqual': '5.7.1'}, {'status': 'unaffected', 'version': '5.5.4', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '5.6.2', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '5.7.2', 'versionType': 'semver'}], 'defaultStatus': 'affected'}] [{'vendor': 'JTL Software', 'product': 'JTL Shop', 'versions': [{'status': 'unaffected', 'version': '5.0.0', 'versionType': 'semver', 'lessThanOrEqual': '5.1.8'}, {'status': 'affected', 'version': '5.2.0', 'lessThan': '5.4.0', 'versionType': 'semver'}, {'status': 'affected', 'version': '5.4.0', 'versionType': 'semver', 'lessThanOrEqual': '5.7.1'}, {'status': 'unaffected', 'version': '5.5.4', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '5.6.2', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '5.7.2', 'versionType': 'semver'}], 'defaultStatus': 'affected'}] -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Jun. 22, 2026
Action Type Old Value New Value Added SSVC {'id': 'CVE-2026-54390', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'none'}, {'automatable': 'yes'}, {'technicalImpact': 'total'}], 'version': '2.0.3', 'timestamp': '2026-06-22T12:39:02.156506Z'} -
New CVE Received by [email protected]
Jun. 18, 2026
Action Type Old Value New Value Added Affected [{'vendor': 'JTL Software', 'product': 'JTL Shop', 'versions': [{'status': 'unaffected', 'version': '5.0.0', 'versionType': 'semver', 'lessThanOrEqual': '5.1.8'}, {'status': 'affected', 'version': '5.2.0', 'versionType': 'custom', 'lessThanOrEqual': '5.3.x'}, {'status': 'affected', 'version': '5.4.0', 'versionType': 'semver', 'lessThanOrEqual': '5.7.1'}, {'status': 'unaffected', 'version': '5.5.4', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '5.6.2', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '5.7.2', 'versionType': 'semver'}], 'defaultStatus': 'affected'}] Added 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. Added CVSS V4.0 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 Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Added CWE CWE-1336 Added Reference https://forum.jtl-software.de/threads/jtl-shop-5-7-aktuell-5-7-2.246278/ Added Reference https://sansec.io/research/jtl-shop-ssti-rce Added Reference https://www.vulncheck.com/advisories/jtl-shop-server-side-template-injection-via-smarty-renderer