Answer in brief
CVE-2026-54390 records a Critical severity (CVSS 9.3) vulnerability in JTL Shop < 5.7.2 Server-Side Template Injection via Smarty Renderer. The current sources do not mark it as known exploited. The current feed maps JTL Software/JTL Shop (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 9.3. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps JTL Software/JTL Shop (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| JTL Software/JTL Shopgeneric | >=5.2.0 <5.4.0 || >=5.4.0 <5.5.4 || >=5.6.0 <5.6.2 || >=5.7.0 <5.7.2 | 5.5.4, 5.6.2, 5.7.2 |
Published upstream
Jun 18, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Oct 29, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Jun 22, 2026
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.
Quoted source text, attributed separately from HOL analysis.