{"document":{"category":"csaf_vex","csaf_version":"2.0","title":"CVE-2026-54390: JTL Shop < 5.7.2 Server-Side Template Injection via Smarty Renderer","publisher":{"category":"vendor","name":"HarborGuard Database","namespace":"https://database.harborguard.co"},"tracking":{"id":"CVE-2026-54390","status":"final","version":"1","initial_release_date":"2026-06-18T17:33:46.230Z","current_release_date":"2026-06-18T17:33:46.230Z","revision_history":[{"date":"2026-06-18T17:33:46.230Z","number":"1","summary":"Initial machine-readable export from HarborGuard."}]},"distribution":{"tlp":{"label":"WHITE"},"text":"Public CVE data; freely redistributable."},"notes":[{"category":"description","text":"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.","title":"CVE description"}],"references":[{"category":"self","summary":"CVE-2026-54390 on HarborGuard Database","url":"https://database.harborguard.co/cve/CVE-2026-54390"},{"category":"external","summary":"CVE Record","url":"https://www.cve.org/CVERecord?id=CVE-2026-54390"},{"category":"external","summary":"sansec.io","url":"https://sansec.io/research/jtl-shop-ssti-rce"},{"category":"external","summary":"forum.jtl-software.de","url":"https://forum.jtl-software.de/threads/jtl-shop-5-7-aktuell-5-7-2.246278/"},{"category":"external","summary":"vulncheck.com","url":"https://www.vulncheck.com/advisories/jtl-shop-server-side-template-injection-via-smarty-renderer"}]},"product_tree":{"branches":[{"category":"vendor","name":"JTL Software","branches":[{"category":"product_name","name":"JTL Shop","branches":[{"category":"product_version_range","name":">=5.2.0 <=5.3.x","product":{"name":"JTL Software JTL Shop >=5.2.0 <=5.3.x","product_id":"CSAFPID-1","product_identification_helper":{"cpe":"cpe:2.3:a:jtl_software:jtl_shop:*:*:*:*:*:*:*:*"}}},{"category":"product_version_range","name":">=5.4.0 <=5.7.1","product":{"name":"JTL Software JTL Shop >=5.4.0 <=5.7.1","product_id":"CSAFPID-2","product_identification_helper":{"cpe":"cpe:2.3:a:jtl_software:jtl_shop:*:*:*:*:*:*:*:*"}}},{"category":"product_version","name":"5.0.0","product":{"name":"JTL Software JTL Shop 5.0.0","product_id":"CSAFPID-3","product_identification_helper":{"cpe":"cpe:2.3:a:jtl_software:jtl_shop:*:*:*:*:*:*:*:*"}}},{"category":"product_version","name":"5.5.4","product":{"name":"JTL Software JTL Shop 5.5.4","product_id":"CSAFPID-4","product_identification_helper":{"cpe":"cpe:2.3:a:jtl_software:jtl_shop:*:*:*:*:*:*:*:*"}}},{"category":"product_version","name":"5.6.2","product":{"name":"JTL Software JTL Shop 5.6.2","product_id":"CSAFPID-5","product_identification_helper":{"cpe":"cpe:2.3:a:jtl_software:jtl_shop:*:*:*:*:*:*:*:*"}}},{"category":"product_version","name":"5.7.2","product":{"name":"JTL Software JTL Shop 5.7.2","product_id":"CSAFPID-6","product_identification_helper":{"cpe":"cpe:2.3:a:jtl_software:jtl_shop:*:*:*:*:*:*:*:*"}}}]}]}]},"vulnerabilities":[{"cve":"CVE-2026-54390","title":"JTL Shop < 5.7.2 Server-Side Template Injection via Smarty Renderer","notes":[{"category":"description","text":"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.","title":"CVE description"}],"product_status":{"known_affected":["CSAFPID-1","CSAFPID-2"],"fixed":["CSAFPID-3","CSAFPID-4","CSAFPID-5","CSAFPID-6"]},"scores":[{"cvss_v4":{"version":"4.0","vectorString":"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","baseScore":9.3,"baseSeverity":"CRITICAL"},"products":["CSAFPID-1","CSAFPID-2"]}],"remediations":[{"category":"vendor_fix","details":"Update to a fixed version: 5.0.0, 5.5.4, 5.6.2, 5.7.2.","product_ids":["CSAFPID-1","CSAFPID-2"],"url":"https://forum.jtl-software.de/threads/jtl-shop-5-7-aktuell-5-7-2.246278/"}]}]}