Common Weakness Enumeration

CWE-434

Allowed

Unrestricted Upload of File with Dangerous Type

Abstraction: Base · Status: Draft

API response cwe.mitre.org

The product allows the upload or transfer of dangerous file types that are automatically processed within its environment.

5968 vulnerabilities reference this CWE, most recent first.

CVE-2021-4330 (GCVE-0-2021-4330)

Vulnerability from cvelistv5 – Published: 2023-03-07 13:51 – Updated: 2026-04-08 16:58
VLAI
Title
Envato Elements <= 2.0.10 & Template Kit <= 1.0.13 - Authenticated (Contributor+) Arbitrary File Upload
Summary
The Envato Elements & Download and Template Kit – Import plugins for WordPress are vulnerable to arbitrary file uploads due to insufficient validation of file type upon extracting uploaded Zip files in the installFreeTemplateKit and uploadTemplateKitZipFile functions. This makes it possible for attackers with contributor-lever permissions and above to upload arbitrary files and potentially gain remote code execution in versions up to and including 1.0.13 of Template Kit – Import and versions up to and including 2.0.10 of Envato Elements & Download.
Severity
8.8 (High)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
  • CWE-434 - Unrestricted Upload of File with Dangerous Type
Assigner
References
Impacted products
Credits
Chloe Chamberland
Show details on NVD website
To clipboard 

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CVE-2021-4225 (GCVE-0-2021-4225)

Vulnerability from cvelistv5 – Published: 2022-04-25 15:50 – Updated: 2024-08-03 17:16
VLAI
Title
SP Project & Document Manager < 4.24 - Subscriber+ Shell Upload
Summary
The SP Project & Document Manager WordPress plugin before 4.24 allows any authenticated users, such as subscribers, to upload files. The plugin attempts to prevent PHP and other similar files that could be executed on the server from being uploaded by checking the file extension. It was discovered that on Windows servers, the security checks in place were insufficient, enabling bad actors to potentially upload backdoors on vulnerable sites.
Severity
No CVSS data available.
CWE
  • CWE-434 - Unrestricted Upload of File with Dangerous Type
Assigner
References
Impacted products
Vendor Product Version
Unknown SP Project & Document Manager Affected: 4.24 , < 4.24 (custom)
Create a notification for this product.
Credits
pang0lin @webray.com.cn inc
Show details on NVD website
To clipboard 

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CVE-2021-4096 (GCVE-0-2021-4096)

Vulnerability from cvelistv5 – Published: 2022-04-19 20:26 – Updated: 2025-02-07 20:48
VLAI
Title
Fancy Product Designer <= 4.7.5 - Cross-Site Request Forgery to Arbitrary File Upload
Summary
The Fancy Product Designer plugin for WordPress is vulnerable to Cross-Site Request Forgery via the FPD_Admin_Import class that makes it possible for attackers to upload malicious files that could be used to gain webshell access to a server in versions up to, and including, 4.7.5.
Severity
8.8 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
  • CWE-352 - Cross-Site Request Forgery (CSRF)
  • CWE-434 - Unrestricted Upload of File with Dangerous Type
Assigner
References
Impacted products
Vendor Product Version
fancy-product-designer Fancy Product Designer Affected: 4.7.5 , ≤ 4.7.5 (custom)
Create a notification for this product.
Credits
Lin Yu
Show details on NVD website
To clipboard 

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CVE-2021-4080 (GCVE-0-2021-4080)

Vulnerability from cvelistv5 – Published: 2022-01-12 14:05 – Updated: 2024-08-03 17:16
VLAI
Title
Unrestricted Upload of File with Dangerous Type in crater-invoice/crater
Summary
crater is vulnerable to Unrestricted Upload of File with Dangerous Type
Severity
8.8 (High)
CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE
  • CWE-434 - Unrestricted Upload of File with Dangerous Type
Assigner
References
Impacted products
Vendor Product Version
crater-invoice crater-invoice/crater Affected: unspecified , < 6.0.0 (custom)
Create a notification for this product.
Show details on NVD website
To clipboard 

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CVE-2021-3915 (GCVE-0-2021-3915)

Vulnerability from cvelistv5 – Published: 2021-11-13 09:15 – Updated: 2024-08-03 17:09
VLAI
Title
Unrestricted Upload of File with Dangerous Type in bookstackapp/bookstack
Summary
bookstack is vulnerable to Unrestricted Upload of File with Dangerous Type
Severity
7.6 (High)
CVSS:3.0/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:L/A:H
CWE
  • CWE-434 - Unrestricted Upload of File with Dangerous Type
Assigner
References
Impacted products
Vendor Product Version
bookstackapp bookstackapp/bookstack Affected: unspecified , < 21.10.3 (custom)
Create a notification for this product.
Show details on NVD website
To clipboard 

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CVE-2021-3906 (GCVE-0-2021-3906)

Vulnerability from cvelistv5 – Published: 2021-10-27 21:20 – Updated: 2024-08-03 17:09
VLAI
Title
Unrestricted Upload of File with Dangerous Type in bookstackapp/bookstack
Summary
bookstack is vulnerable to Unrestricted Upload of File with Dangerous Type
Severity
5.4 (Medium)
CVSS:3.0/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
CWE
  • CWE-434 - Unrestricted Upload of File with Dangerous Type
Assigner
References
Impacted products
Vendor Product Version
bookstackapp bookstackapp/bookstack Affected: unspecified , < 21.10.1 (custom)
Create a notification for this product.
Show details on NVD website
To clipboard 

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CVE-2021-3846 (GCVE-0-2021-3846)

Vulnerability from cvelistv5 – Published: 2021-10-19 12:30 – Updated: 2024-08-03 17:09
VLAI
Title
Unrestricted Upload of File with Dangerous Type in firefly-iii/firefly-iii
Summary
firefly-iii is vulnerable to Unrestricted Upload of File with Dangerous Type
Severity
6.3 (Medium)
CVSS:3.0/AV:L/AC:H/PR:H/UI:R/S:U/C:H/I:H/A:H
CWE
  • CWE-434 - Unrestricted Upload of File with Dangerous Type
Assigner
References
Impacted products
Vendor Product Version
firefly-iii firefly-iii/firefly-iii Affected: unspecified , < 5.6.2 (custom)
Create a notification for this product.
Show details on NVD website
To clipboard 

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CVE-2021-3832 (GCVE-0-2021-3832)

Vulnerability from cvelistv5 – Published: 2021-10-07 13:33 – Updated: 2024-09-17 02:36
VLAI
Title
Integria IMS Remote Code Execution
Summary
Integria IMS in its 5.0.92 version is vulnerable to a Remote Code Execution attack through file uploading. An unauthenticated attacker could abuse the AsyncUpload() function in order to exploit the vulnerability.
Severity
9.8 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CWE
  • CWE-434 - Unrestricted Upload of File with Dangerous Type
Assigner
References
Impacted products
Vendor Product Version
Ártica Integria IMS Affected: 5.0.92
Create a notification for this product.
Date Public
2021-10-06 00:00
Credits
Discovered by @nag0mez (special mention to @_Barriuso).
Show details on NVD website
To clipboard 

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CVE-2021-3745 (GCVE-0-2021-3745)

Vulnerability from cvelistv5 – Published: 2021-10-28 17:05 – Updated: 2024-08-03 17:01
VLAI
Title
Unrestricted Upload of File with Dangerous Type in flatcore/flatcore-cms
Summary
flatcore-cms is vulnerable to Unrestricted Upload of File with Dangerous Type
Severity
8 (High)
CVSS:3.0/AV:N/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H
CWE
  • CWE-434 - Unrestricted Upload of File with Dangerous Type
Assigner
References
Impacted products
Vendor Product Version
flatcore flatcore/flatcore-cms Affected: unspecified , ≤ 2.1.0 (custom)
Create a notification for this product.
Show details on NVD website
To clipboard 

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CVE-2020-37227 (GCVE-0-2020-37227)

Vulnerability from cvelistv5 – Published: 2026-05-16 15:25 – Updated: 2026-05-18 18:14
VLAI
Title
WordPress Plugin HS Brand Logo Slider 2.1 Unrestricted File Upload
Summary
HS Brand Logo Slider 2.1 contains an unrestricted file upload vulnerability that allows authenticated users to bypass client-side file extension validation by uploading arbitrary files. Attackers can intercept upload requests to the logoupload parameter in the admin interface and rename files to executable extensions .php to achieve remote code execution.
Severity
8.7 (High)
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
8.8 (High)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
SSVC
Exploitation: poc Automatable: no Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
  • CWE-434 - Unrestricted Upload of File with Dangerous Type
Assigner
References
Impacted products
Date Public
2020-10-20 00:00
Credits
Net-Hunter
Show details on NVD website
To clipboard 

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            "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/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"
        },
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 8.8,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "LOW",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "format": "CVSS"
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-434",
              "description": "Unrestricted Upload of File with Dangerous Type",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-05-16T15:25:45.310Z",
        "orgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10",
        "shortName": "VulnCheck"
      },
      "references": [
        {
          "name": "ExploitDB-48913",
          "tags": [
            "exploit"
          ],
          "url": "https://www.exploit-db.com/exploits/48913"
        },
        {
          "name": "Official Product Homepage",
          "tags": [
            "product"
          ],
          "url": "https://www.heliossolutions.co/"
        },
        {
          "name": "Product Reference",
          "tags": [
            "product"
          ],
          "url": "https://ms.wordpress.org/plugins/hs-brand-logo-slider/"
        },
        {
          "name": "VulnCheck Advisory: WordPress Plugin HS Brand Logo Slider 2.1 Unrestricted File Upload",
          "tags": [
            "third-party-advisory"
          ],
          "url": "https://www.vulncheck.com/advisories/wordpress-plugin-hs-brand-logo-slider-unrestricted-file-upload"
        }
      ],
      "title": "WordPress Plugin HS Brand Logo Slider 2.1 Unrestricted File Upload",
      "x_generator": {
        "engine": "vulncheck"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10",
    "assignerShortName": "VulnCheck",
    "cveId": "CVE-2020-37227",
    "datePublished": "2026-05-16T15:25:45.310Z",
    "dateReserved": "2026-05-15T13:25:19.369Z",
    "dateUpdated": "2026-05-18T18:14:00.680Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}
Mitigation
Architecture and Design

Generate a new, unique filename for an uploaded file instead of using the user-supplied filename, so that no external input is used at all.[REF-422] [REF-423]

Mitigation MIT-21
Architecture and Design

Strategy: Enforcement by Conversion

When the set of acceptable objects, such as filenames or URLs, is limited or known, create a mapping from a set of fixed input values (such as numeric IDs) to the actual filenames or URLs, and reject all other inputs.

Mitigation
Architecture and Design

Consider storing the uploaded files outside of the web document root entirely. Then, use other mechanisms to deliver the files dynamically. [REF-423]

Mitigation MIT-5
Implementation

Strategy: Input Validation

  • Assume all input is malicious. Use an "accept known good" input validation strategy, i.e., use a list of acceptable inputs that strictly conform to specifications. Reject any input that does not strictly conform to specifications, or transform it into something that does.
  • When performing input validation, consider all potentially relevant properties, including length, type of input, the full range of acceptable values, missing or extra inputs, syntax, consistency across related fields, and conformance to business rules. As an example of business rule logic, "boat" may be syntactically valid because it only contains alphanumeric characters, but it is not valid if the input is only expected to contain colors such as "red" or "blue."
  • Do not rely exclusively on looking for malicious or malformed inputs. This is likely to miss at least one undesirable input, especially if the code's environment changes. This can give attackers enough room to bypass the intended validation. However, denylists can be useful for detecting potential attacks or determining which inputs are so malformed that they should be rejected outright.
  • For example, limiting filenames to alphanumeric characters can help to restrict the introduction of unintended file extensions.
Mitigation
Architecture and Design

Define a very limited set of allowable extensions and only generate filenames that end in these extensions. Consider the possibility of XSS (CWE-79) before allowing .html or .htm file types.

Mitigation
Implementation

Strategy: Input Validation

Ensure that only one extension is used in the filename. Some web servers, including some versions of Apache, may process files based on inner extensions so that "filename.php.gif" is fed to the PHP interpreter.[REF-422] [REF-423]

Mitigation
Implementation

When running on a web server that supports case-insensitive filenames, perform case-insensitive evaluations of the extensions that are provided.

Mitigation MIT-15
Architecture and Design

For any security checks that are performed on the client side, ensure that these checks are duplicated on the server side, in order to avoid CWE-602. Attackers can bypass the client-side checks by modifying values after the checks have been performed, or by changing the client to remove the client-side checks entirely. Then, these modified values would be submitted to the server.

Mitigation
Implementation

Do not rely exclusively on sanity checks of file contents to ensure that the file is of the expected type and size. It may be possible for an attacker to hide code in some file segments that will still be executed by the server. For example, GIF images may contain a free-form comments field.

Mitigation
Implementation

Do not rely exclusively on the MIME content type or filename attribute when determining how to render a file. Validating the MIME content type and ensuring that it matches the extension is only a partial solution.

Mitigation MIT-17
Architecture and Design Operation

Strategy: Environment Hardening

Run your code using the lowest privileges that are required to accomplish the necessary tasks [REF-76]. If possible, create isolated accounts with limited privileges that are only used for a single task. That way, a successful attack will not immediately give the attacker access to the rest of the software or its environment. For example, database applications rarely need to run as the database administrator, especially in day-to-day operations.

Mitigation MIT-22
Architecture and Design Operation

Strategy: Sandbox or Jail

  • Run the code in a "jail" or similar sandbox environment that enforces strict boundaries between the process and the operating system. This may effectively restrict which files can be accessed in a particular directory or which commands can be executed by the software.
  • OS-level examples include the Unix chroot jail, AppArmor, and SELinux. In general, managed code may provide some protection. For example, java.io.FilePermission in the Java SecurityManager allows the software to specify restrictions on file operations.
  • This may not be a feasible solution, and it only limits the impact to the operating system; the rest of the application may still be subject to compromise.
  • Be careful to avoid CWE-243 and other weaknesses related to jails.
CAPEC-1: Accessing Functionality Not Properly Constrained by ACLs

In applications, particularly web applications, access to functionality is mitigated by an authorization framework. This framework maps Access Control Lists (ACLs) to elements of the application's functionality; particularly URL's for web apps. In the case that the administrator failed to specify an ACL for a particular element, an attacker may be able to access it with impunity. An attacker with the ability to access functionality not properly constrained by ACLs can obtain sensitive information and possibly compromise the entire application. Such an attacker can access resources that must be available only to users at a higher privilege level, can access management sections of the application, or can run queries for data that they otherwise not supposed to.

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