Vulnerability in Jtl Software Shop
CVE-2026-54390
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.006 (46.8th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 47th percentile — 46.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.006 · newest: 0.006 · change: 0.000
Affected products
- Jtl Software Shop — versions 5.0.0, 5.2.0, 5.4.0
Weakness classification (CWE)
Public proof-of-concept exploits
References
- sansec.io/research/jtl-shop-ssti-rce (technical-description)
- forum.jtl-software.de/threads/jtl-shop-5-7-aktuell-5-7-2.246278/ (release-notes, patch)
- www.vulncheck.com/advisories/jtl-shop-server-side-template-injection-via-smarty… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-54390?
- CVE-2026-54390 is a critical-severity vulnerability in Jtl Software Shop, classified under Improper Neutralization of Special Elements Used in a Template Engine. CVSS score: 9.8/10. Published 2026-06-18.
- How severe is CVE-2026-54390?
- Critical severity. CVSS v3 base score is 9.8 out of 10.
- Is CVE-2026-54390 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.