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4 vulnerabilities by thymeleaf

CVE-2026-40478 (GCVE-0-2026-40478)

Vulnerability from cvelistv5 – Published: 2026-04-17 21:57 – Updated: 2026-04-17 21:57
VLAI?
Title
Improper neutralization of specific syntax patterns for unauthorized expressions in Thymeleaf
Summary
Thymeleaf is a server-side Java template engine for web and standalone environments. Versions 3.1.3.RELEASE and prior contain a security bypass vulnerability in the the expression execution mechanisms. Although the library provides mechanisms to prevent expression injection, it fails to properly neutralize specific syntax patterns that allow for the execution of unauthorized expressions. If an application developer passes unvalidated user input directly to the template engine, an unauthenticated remote attacker can bypass the library's protections to achieve Server-Side Template Injection (SSTI). This issue has ben fixed in version 3.1.4.RELEASE.
Severity ?
9.1 (Critical)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H
CWE
  • CWE-917 - Improper Neutralization of Special Elements used in an Expression Language Statement ('Expression Language Injection')
  • CWE-1336 - Improper Neutralization of Special Elements Used in a Template Engine
Assigner
References
Impacted products
Vendor Product Version
thymeleaf thymeleaf Affected: < 3.1.4.RELEASE
Create a notification for this product.
Show details on NVD website
To clipboard 

{
  "containers": {
    "cna": {
      "affected": [
        {
          "product": "thymeleaf",
          "vendor": "thymeleaf",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 3.1.4.RELEASE"
            }
          ]
        },
        {
          "product": "org.thymeleaf:thymeleaf-spring5",
          "vendor": "thymeleaf",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 3.1.4.RELEASE"
            }
          ]
        },
        {
          "product": "org.thymeleaf:thymeleaf-spring6",
          "vendor": "thymeleaf",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 3.1.4.RELEASE"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
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        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "HIGH",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 9.1,
            "baseSeverity": "CRITICAL",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "scope": "CHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H",
            "version": "3.1"
          }
        }
      ],
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        {
          "descriptions": [
            {
              "cweId": "CWE-917",
              "description": "CWE-917: Improper Neutralization of Special Elements used in an Expression Language Statement (\u0027Expression Language Injection\u0027)",
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              "type": "CWE"
            }
          ]
        },
        {
          "descriptions": [
            {
              "cweId": "CWE-1336",
              "description": "CWE-1336: Improper Neutralization of Special Elements Used in a Template Engine",
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            }
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        }
      ],
      "source": {
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        "discovery": "UNKNOWN"
      },
      "title": "Improper neutralization of specific syntax patterns for unauthorized expressions in Thymeleaf"
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}

CVE-2026-40477 (GCVE-0-2026-40477)

Vulnerability from cvelistv5 – Published: 2026-04-17 21:53 – Updated: 2026-04-17 21:53
VLAI?
Title
Improper restriction of the scope of accessible objects in Thymeleaf expressions
Summary
Thymeleaf is a server-side Java template engine for web and standalone environments. Versions 3.1.3.RELEASE and prior contain a security bypass vulnerability in the expression execution mechanisms. Although the library provides mechanisms to prevent expression injection, it fails to properly restrict the scope of accessible objects, allowing specific potentially sensitive objects to be reached from within a template. If an application developer passes unvalidated user input directly to the template engine, an unauthenticated remote attacker can bypass the library's protections to achieve Server-Side Template Injection (SSTI). This issue has ben fixed in version 3.1.4.RELEASE.
Severity ?
9.1 (Critical)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H
CWE
  • CWE-917 - Improper Neutralization of Special Elements used in an Expression Language Statement ('Expression Language Injection')
  • CWE-1336 - Improper Neutralization of Special Elements Used in a Template Engine
Assigner
References
Impacted products
Vendor Product Version
thymeleaf thymeleaf Affected: < 3.1.4.RELEASE
Create a notification for this product.
Show details on NVD website
To clipboard 

{
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    "cna": {
      "affected": [
        {
          "product": "thymeleaf",
          "vendor": "thymeleaf",
          "versions": [
            {
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              "version": "\u003c 3.1.4.RELEASE"
            }
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        },
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          "vendor": "thymeleaf",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 3.1.4.RELEASE"
            }
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        },
        {
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          "vendor": "thymeleaf",
          "versions": [
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            }
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      ],
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        }
      ],
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            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 9.1,
            "baseSeverity": "CRITICAL",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
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              "cweId": "CWE-1336",
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          ],
          "url": "https://github.com/thymeleaf/thymeleaf/security/advisories/GHSA-r4v4-5mwr-2fwr"
        }
      ],
      "source": {
        "advisory": "GHSA-r4v4-5mwr-2fwr",
        "discovery": "UNKNOWN"
      },
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    }
  },
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  },
  "dataType": "CVE_RECORD",
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}

CVE-2023-38286 (GCVE-0-2023-38286)

Vulnerability from cvelistv5 – Published: 2023-07-14 00:00 – Updated: 2024-10-30 16:01
VLAI?
Summary
Thymeleaf through 3.1.1.RELEASE, as used in spring-boot-admin (aka Spring Boot Admin) through 3.1.1 and other products, allows sandbox bypass via crafted HTML. This may be relevant for SSTI (Server Side Template Injection) and code execution in spring-boot-admin if MailNotifier is enabled and there is write access to environment variables via the UI.
Severity ?
No CVSS data available.
CWE
  • n/a
Assigner
References
Show details on NVD website
To clipboard 

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            "url": "https://github.com/p1n93r/SpringBootAdmin-thymeleaf-SSTI"
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CVE-2021-43466 (GCVE-0-2021-43466)

Vulnerability from cvelistv5 – Published: 2021-11-09 00:00 – Updated: 2024-08-04 03:55
VLAI?
Summary
In the thymeleaf-spring5:3.0.12 component, thymeleaf combined with specific scenarios in template injection may lead to remote code execution.
Severity ?
No CVSS data available.
CWE
  • n/a
Assigner
References
Show details on NVD website
To clipboard 

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            "url": "https://security.netapp.com/advisory/ntap-20221014-0001/"
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