CVE-2026-54390 (GCVE-0-2026-54390)

Vulnerability from cvelistv5 – Published: 2026-06-18 17:33 – Updated: 2026-06-18 17:33 X_Open Source
VLAI
Title
JTL Shop < 5.7.2 Server-Side Template Injection via Smarty Renderer
Summary
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.
Severity
9.3 (Critical)
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
9.8 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CWE
  • CWE-1336 - Improper Neutralization of Special Elements Used in a Template Engine
Assigner
References
Impacted products
Vendor Product Version
JTL Software JTL Shop Unaffected: 5.0.0 , ≤ 5.1.8 (semver)
Affected: 5.2.0 , ≤ 5.3.x (custom)
Affected: 5.4.0 , ≤ 5.7.1 (semver)
Unaffected: 5.5.4 (semver)
Unaffected: 5.6.2 (semver)
Unaffected: 5.7.2 (semver)
Create a notification for this product.
Date Public
2026-04-08 00:00
Credits
Sansec
Show details on NVD website
To clipboard 

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "affected",
          "product": "JTL Shop",
          "vendor": "JTL Software",
          "versions": [
            {
              "lessThanOrEqual": "5.1.8",
              "status": "unaffected",
              "version": "5.0.0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.3.x",
              "status": "affected",
              "version": "5.2.0",
              "versionType": "custom"
            },
            {
              "lessThanOrEqual": "5.7.1",
              "status": "affected",
              "version": "5.4.0",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "5.5.4",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "5.6.2",
              "versionType": "semver"
            },
            {
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              "version": "5.7.2",
              "versionType": "semver"
            }
          ]
        }
      ],
      "credits": [
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          "type": "finder",
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      "descriptions": [
        {
          "lang": "en",
          "value": "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."
        }
      ],
      "metrics": [
        {
          "cvssV4_0": {
            "Automatable": "NOT_DEFINED",
            "Recovery": "NOT_DEFINED",
            "Safety": "NOT_DEFINED",
            "attackComplexity": "LOW",
            "attackRequirements": "NONE",
            "attackVector": "NETWORK",
            "baseScore": 9.3,
            "baseSeverity": "CRITICAL",
            "exploitMaturity": "NOT_DEFINED",
            "privilegesRequired": "NONE",
            "providerUrgency": "NOT_DEFINED",
            "subAvailabilityImpact": "NONE",
            "subConfidentialityImpact": "NONE",
            "subIntegrityImpact": "NONE",
            "userInteraction": "NONE",
            "valueDensity": "NOT_DEFINED",
            "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",
            "version": "4.0",
            "vulnAvailabilityImpact": "HIGH",
            "vulnConfidentialityImpact": "HIGH",
            "vulnIntegrityImpact": "HIGH",
            "vulnerabilityResponseEffort": "NOT_DEFINED"
          },
          "format": "CVSS",
          "scenarios": [
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              "value": "GENERAL"
            }
          ]
        },
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 9.8,
            "baseSeverity": "CRITICAL",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "format": "CVSS",
          "scenarios": [
            {
              "lang": "en",
              "value": "GENERAL"
            }
          ]
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-1336",
              "description": "Improper Neutralization of Special Elements Used in a Template Engine",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-06-18T17:33:46.230Z",
        "orgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10",
        "shortName": "VulnCheck"
      },
      "references": [
        {
          "tags": [
            "technical-description"
          ],
          "url": "https://sansec.io/research/jtl-shop-ssti-rce"
        },
        {
          "tags": [
            "release-notes",
            "patch"
          ],
          "url": "https://forum.jtl-software.de/threads/jtl-shop-5-7-aktuell-5-7-2.246278/"
        },
        {
          "tags": [
            "third-party-advisory"
          ],
          "url": "https://www.vulncheck.com/advisories/jtl-shop-server-side-template-injection-via-smarty-renderer"
        }
      ],
      "source": {
        "discovery": "UNKNOWN"
      },
      "tags": [
        "x_open-source"
      ],
      "title": "JTL Shop \u003c 5.7.2 Server-Side Template Injection via Smarty Renderer",
      "x_generator": {
        "engine": "vulncheck"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10",
    "assignerShortName": "VulnCheck",
    "cveId": "CVE-2026-54390",
    "datePublished": "2026-06-18T17:33:46.230Z",
    "dateReserved": "2026-06-12T20:20:02.950Z",
    "dateUpdated": "2026-06-18T17:33:46.230Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
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  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


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