Common Weakness Enumeration

CWE-434

Weakness Allowed

Unrestricted Upload of File with Dangerous Type

Abstraction: Base · Status: Draft

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

Mapping guidance

This CWE entry is at the Base level of abstraction, which is a preferred level of abstraction for mapping to the root causes of vulnerabilities.

Carefully read both the name and description to ensure that this mapping is an appropriate fit. Do not try to 'force' a mapping to a lower-level Base/Variant simply to comply with this preferred level of abstraction.

Relationships and members
ChildOf: CWE-669 · View CWE-1000
ChildOf: CWE-669 · View CWE-1003
PeerOf: CWE-351 (symmetric) · View CWE-1000
PeerOf: CWE-436 (symmetric) · View CWE-1000
PeerOf: CWE-430 (symmetric) · View CWE-1000
Modes of introduction
Implementation
Architecture and Design

OMISSION: This weakness is caused by missing a security tactic during the architecture and design phase.

Detection methods

Dynamic Analysis with Automated Results Interpretation

According to SOAR [REF-1479], the following detection techniques may be useful:

Cost effective for partial coverage:

Web Application Scanner

Web Services Scanner

Database Scanners

Effectiveness: SOAR Partial

Dynamic Analysis with Manual Results Interpretation

According to SOAR [REF-1479], the following detection techniques may be useful:

Cost effective for partial coverage:

Fuzz Tester

Framework-based Fuzzer

Effectiveness: SOAR Partial

Manual Static Analysis - Source Code

According to SOAR [REF-1479], the following detection techniques may be useful:

Highly cost effective:

Focused Manual Spotcheck - Focused manual analysis of source

Manual Source Code Review (not inspections)

Effectiveness: High

Automated Static Analysis - Source Code

According to SOAR [REF-1479], the following detection techniques may be useful:

Highly cost effective:

Source code Weakness Analyzer

Context-configured Source Code Weakness Analyzer

Effectiveness: High

Architecture or Design Review

According to SOAR [REF-1479], the following detection techniques may be useful:

Highly cost effective:

Formal Methods / Correct-By-Construction

Cost effective for partial coverage:

Inspection (IEEE 1028 standard) (can apply to requirements, design, source code, etc.)

Effectiveness: High

Notes

Relationship

This can have a chaining relationship with incomplete denylist / permissive allowlist errors when the product tries, but fails, to properly limit which types of files are allowed (CWE-183, CWE-184).

This can also overlap multiple interpretation errors for intermediaries, e.g. anti-virus products that do not remove or quarantine attachments with certain file extensions that can be processed by client systems.

Content history
Submission: PLOVER · 2006-07-19 · CWE Draft 3
Contribution: Abhi Balakrishnan · 2024-02-29 · CWE 4.15

Provided diagram to improve CWE usability

Modification: Eric Dalci · Cigital · 2008-07-01 · CWE 1.0

updated Time_of_Introduction

Modification: CWE Content Team · MITRE · 2008-09-08 · CWE 1.0

updated Alternate_Terms, Relationships, Other_Notes, Taxonomy_Mappings

Modification: CWE Content Team · MITRE · 2009-01-12 · CWE 1.2

updated Relationships

Modification: CWE Content Team · MITRE · 2009-12-28 · CWE 1.7

updated Applicable_Platforms, Functional_Areas, Likelihood_of_Exploit, Potential_Mitigations, Time_of_Introduction

Modification: CWE Content Team · MITRE · 2010-02-16 · CWE 1.8

converted from Compound_Element to Weakness

Modification: CWE Content Team · MITRE · 2010-02-16 · CWE 1.8

updated Alternate_Terms, Applicable_Platforms, Common_Consequences, Demonstrative_Examples, Name, Other_Notes, Potential_Mitigations, References, Related_Attack_Patterns, Relationship_Notes, Relationships, Type, Weakness_Ordinalities

Modification: CWE Content Team · MITRE · 2010-04-05 · CWE 1.8.1

updated Related_Attack_Patterns

Modification: CWE Content Team · MITRE · 2010-06-21 · CWE 1.9

updated References, Relationship_Notes

Modification: CWE Content Team · MITRE · 2010-09-27 · CWE 1.10

updated Potential_Mitigations

Modification: CWE Content Team · MITRE · 2010-12-13 · CWE 1.11

updated Potential_Mitigations

Modification: CWE Content Team · MITRE · 2011-06-27 · CWE 2.0

updated Relationships

Modification: CWE Content Team · MITRE · 2011-09-13 · CWE 2.1

updated Potential_Mitigations, References, Relationships

Modification: CWE Content Team · MITRE · 2012-05-11 · CWE 2.2

updated References, Relationships

Modification: CWE Content Team · MITRE · 2012-10-30 · CWE 2.3

updated Potential_Mitigations

Modification: CWE Content Team · MITRE · 2014-07-30 · CWE 2.8

updated Detection_Factors

Modification: CWE Content Team · MITRE · 2015-12-07 · CWE 2.9

updated Relationships

Modification: CWE Content Team · MITRE · 2017-11-08 · CWE 3.0

updated Affected_Resources, Applicable_Platforms, Likelihood_of_Exploit, Modes_of_Introduction, References, Relationships, Weakness_Ordinalities

Modification: CWE Content Team · MITRE · 2019-01-03 · CWE 3.2

updated References, Relationships, Taxonomy_Mappings

Modification: CWE Content Team · MITRE · 2019-06-20 · CWE 3.3

updated Related_Attack_Patterns

Modification: CWE Content Team · MITRE · 2019-09-19 · CWE 3.4

updated Relationships

Modification: CWE Content Team · MITRE · 2020-02-24 · CWE 4.0

updated Applicable_Platforms, Potential_Mitigations

Modification: CWE Content Team · MITRE · 2020-06-25 · CWE 4.1

updated Potential_Mitigations, Relationship_Notes

Modification: CWE Content Team · MITRE · 2020-08-20 · CWE 4.2

updated Relationships

Modification: CWE Content Team · MITRE · 2020-12-10 · CWE 4.3

updated Relationships

Modification: CWE Content Team · MITRE · 2021-03-15 · CWE 4.4

updated Demonstrative_Examples

Modification: CWE Content Team · MITRE · 2021-07-20 · CWE 4.5

updated Relationships

Modification: CWE Content Team · MITRE · 2021-10-28 · CWE 4.6

updated Relationships

Modification: CWE Content Team · MITRE · 2022-04-28 · CWE 4.7

updated Research_Gaps

Modification: CWE Content Team · MITRE · 2022-06-28 · CWE 4.8

updated Relationships

Modification: CWE Content Team · MITRE · 2022-10-13 · CWE 4.9

updated References

Modification: CWE Content Team · MITRE · 2023-01-31 · CWE 4.10

updated Alternate_Terms, Description

Modification: CWE Content Team · MITRE · 2023-04-27 · CWE 4.11

updated References, Relationships

Modification: CWE Content Team · MITRE · 2023-06-29 · CWE 4.12

updated Mapping_Notes, Relationships

Modification: CWE Content Team · MITRE · 2024-02-29 · CWE 4.14

updated Observed_Examples

Modification: CWE Content Team · MITRE · 2024-07-16 · CWE 4.15

updated Common_Consequences, Description, Diagram, Weakness_Ordinalities

Modification: CWE Content Team · MITRE · 2024-11-19 · CWE 4.16

updated Relationships

Modification: CWE Content Team · MITRE · 2025-09-09 · CWE 4.18

updated Detection_Factors, References

Modification: CWE Content Team · MITRE · 2025-12-11 · CWE 4.19

updated Relationships

Modification: CWE Content Team · MITRE · 2026-04-30 · CWE 4.20

updated Applicable_Platforms, Relationships

Modification: CWE Content Team · MITRE · 2026-10-28 · CWE 5.0

updated Observed_Examples, References

6649 vulnerabilities reference this CWE, most recent first.

CVE-2026-88857 (GCVE-0-2026-88857)

Vulnerability from cvelistv5 – Published: 2026-09-20 17:54 – Updated: 2026-09-22 04:48
VLAI
Title
Joomla Extension - OrdaSoft.com - Authenticated, Privileged Remote Code Execution in OrdaSoft Joomla Gallery extension for Joomla < 6.2.7
Summary
Joomla Extension - OrdaSoft.com - Authenticated, Privileged Remote Code Execution in OrdaSoft Joomla Gallery extension for Joomla < 6.2.7 - The extensions saveWatermark() copied an uploaded file into a web-accessible directory using the client-supplied filename exactly as sent, with no extension check, no content check, and no filename sanitisation of any kind. An authenticated core.manage user could upload a .php file disguised with an image Content-Type header and execute it directly by requesting the resulting path.
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-21 16:25 UTC
CWE
  • CWE-434 - Unrestricted Upload of File with Dangerous Type
Assigner
Joomla CNA under the mitre root
CNA scorecard C 73/100 over 381 records in the last 180 days details
References
URL Tags
https://www.OrdaSoft.com/ product
Show details on NVD website

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CVE-2026-87935 (GCVE-0-2026-87935)

Vulnerability from cvelistv5 – Published: 2026-09-17 04:28 – Updated: 2026-09-19 14:21
VLAI
Title
Paid Downloads <= 3.15 - Unauthenticated Arbitrary File Upload via 'paiddownloads_update_file' Action
Summary
The Paid Downloads plugin for WordPress is vulnerable to Arbitrary File Upload in all versions up to, and including, 3.15 via the admin_request_handler function. This is due to missing authorization and file type validation in the admin_request_handler function, which is reachable unauthenticated via is_admin() returning true for /wp-admin/admin-post.php. This makes it possible for unauthenticated attackers to upload files that may be executable, which makes remote code execution possible. On Apache servers where AllowOverride is enabled, an .htaccess file placed in the upload directory may block direct HTTP retrieval of uploaded files, limiting exploitability to stacks that do not honor .htaccess directives such as nginx, LiteSpeed, and Apache with AllowOverride None.
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-19 13:18 UTC
CWE
  • CWE-434 - Unrestricted Upload of File with Dangerous Type
Assigner
Wordfence CNA under the mitre root
CNA scorecard C 65/100 over 2451 records in the last 180 days details
Impacted products
Vendor Product Version
ichurakov Paid Downloads Affected: 0 , ≤ 3.15 (semver)
Create a notification for this product.
Credits
Show details on NVD website

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CVE-2026-87928 (GCVE-0-2026-87928)

Vulnerability from cvelistv5 – Published: 2026-09-09 16:44 – Updated: 2026-09-24 14:21 X_Open Source Unsupported When Assigned
VLAI
Title
MaxSite CMS 0.94 through 109.6 HTML Upload XSS via admin_page
Summary
MaxSite CMS versions 0.94 through 109.6 contain a cross-site scripting vulnerability in the admin_page upload handler that allows any logged-in user to upload HTML files. Attackers can upload HTML containing malicious scripts to the uploads/_pages/ directory, which executes in visitors' browsers when the file is accessed, enabling persistent stored cross-site scripting attacks.
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-18 17:10 UTC
CWE
  • CWE-434 - Unrestricted Upload of File with Dangerous Type
Assigner
VulnCheck CNA under the mitre root
CNA scorecard B 84/100 over 8103 records in the last 180 days details
Impacted products
Vendor Product Version
MaxSite MaxSite CMS Affected: 0.94 , ≤ 109.6 (custom)
    cpe:2.3:a:max-3000:maxsite_cms:*:*:*:*:*:*:*:*
Create a notification for this product.
Date Public
2026-09-09 00:00
Credits
Show details on NVD website

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CVE-2026-87855 (GCVE-0-2026-87855)

Vulnerability from cvelistv5 – Published: 2026-10-14 03:40 – Updated: 2026-10-14 14:21
VLAI
Title
JTL-Connector for WooCommerce <= 2.4.3 - Unauthenticated Arbitrary File Upload via 'image.push' Method
Summary
The JTL-Connector for WooCommerce plugin for WordPress is vulnerable to Arbitrary File Upload in all versions up to, and including, 2.4.3 via the saveImage() function. This is due to the startSession() function accepting an empty jtlauth parameter as a valid credential, combined with insufficient file type validation in handleImagePush(). This makes it possible for unauthenticated attackers to upload files that may be executable, which makes remote code execution possible.
SSVC
Exploitation: none Automatable: yes Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-14 14:21 UTC
CWE
  • CWE-434 - Unrestricted Upload of File with Dangerous Type
Assigner
Wordfence CNA under the mitre root
CNA scorecard C 65/100 over 2451 records in the last 180 days details
Impacted products
Vendor Product Version
ntbyk JTL-Connector for WooCommerce Affected: 0 , ≤ 2.4.3 (semver)
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CVE-2026-87800 (GCVE-0-2026-87800)

Vulnerability from cvelistv5 – Published: 2026-10-20 21:53 – Updated: 2026-10-21 15:51
VLAI
Title
IBM Cyber Fraud includes components with multiple known vulnerabilities
Summary
IBM Cyber Fraud 1.0.0 through 1.0.2 could allow a remote authenticated attacker to execute arbitrary code due to unrestricted upload of a file with a dangerous type.
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-21 14:24 UTC
CWE
  • CWE-434 - Unrestricted Upload of File with Dangerous Type
Assigner
ibm CNA under the mitre root
CNA scorecard B 88/100 over 1630 records in the last 180 days details
References
URL Tags
https://www.ibm.com/support/pages/node/7290671 vendor-advisorypatch
Impacted products
Vendor Product Version
IBM Cyber Fraud Affected: 1.0.0 , ≤ 1.0.2 (semver)
    cpe:2.3:a:ibm:cyber_fraud:1.0.0:*:*:*:*:*:*:*
    cpe:2.3:a:ibm:cyber_fraud:1.0.2:*:*:*:*:*:*:*
Create a notification for this product.
Show details on NVD website

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CVE-2026-87796 (GCVE-0-2026-87796)

Vulnerability from cvelistv5 – Published: 2026-09-17 04:28 – Updated: 2026-09-19 02:13
VLAI
Title
Multi Uploader for Gravity Forms <= 1.1.9 - Unauthenticated Arbitrary File Upload via Chunked File Upload
Summary
The Multi Uploader for Gravity Forms plugin for WordPress is vulnerable to Arbitrary File Upload in all versions up to, and including, 1.1.9 via the move_file function. This is due to insufficient file type validation during chunked upload handling. This makes it possible for unauthenticated attackers to upload arbitrary files on the affected site's server which may make remote code execution possible.
SSVC
Exploitation: none Automatable: yes Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-19 02:13 UTC
CWE
  • CWE-434 - Unrestricted Upload of File with Dangerous Type
Assigner
Wordfence CNA under the mitre root
CNA scorecard C 65/100 over 2451 records in the last 180 days details
Impacted products
Vendor Product Version
sh1zen Multi Uploader for Gravity Forms Affected: 0 , ≤ 1.1.9 (semver)
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CVE-2026-86666 (GCVE-0-2026-86666)

Vulnerability from cvelistv5 – Published: 2026-09-08 16:00 – Updated: 2026-09-10 13:58
VLAI
Title
aircheng-org iWebShop-5 pic.php uploadFile unrestricted upload
Summary
A security flaw has been discovered in aircheng-org iWebShop-5 up to 5.15. Impacted is the function upload_json/uploadFile of the file controllers/pic.php. The manipulation results in unrestricted upload. The attack can be executed remotely. The exploit has been released to the public and may be used for attacks. The project was informed of the problem early through an issue report but has not responded yet.
SSVC
Exploitation: poc Automatable: yes Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-10 13:57 UTC
CWE
Assigner
VulDB CNA under the mitre root
CNA scorecard B 83/100 over 3851 records in the last 180 days details
References
URL Tags
https://vuldb.com/vuln/399757 vdb-entrytechnical-description
https://vuldb.com/vuln/399757/cti signaturepermissions-required
https://vuldb.com/cve/CVE-2026-86666 third-party-advisory
https://vuldb.com/submit/908924 third-party-advisory
https://github.com/aircheng-org/iWebShop-5/issues/3 exploitissue-tracking
https://github.com/aircheng-org/iWebShop-5/ product
Impacted products
Vendor Product Version
aircheng-org iWebShop-5 Affected: 5.0
Affected: 5.1
Affected: 5.2
Affected: 5.3
Affected: 5.4
Affected: 5.5
Affected: 5.6
Affected: 5.7
Affected: 5.8
Affected: 5.9
Affected: 5.10
Affected: 5.11
Affected: 5.12
Affected: 5.13
Affected: 5.14
Affected: 5.15
    cpe:2.3:a:aircheng-org:iwebshop-5:*:*:*:*:*:*:*:*
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CVE-2026-86461 (GCVE-0-2026-86461)

Vulnerability from cvelistv5 – Published: 2026-10-14 17:29 – Updated: 2026-10-14 17:49
VLAI
Title
FV Flowplayer Video Player <= 7.5.54.7212 - Authenticated (Subscriber+) Arbitrary File Upload via 'video_url' Parameter
Summary
The FV Flowplayer Video Player plugin for WordPress is vulnerable to Limited Arbitrary File Upload in all versions up to, and including, 7.5.54.7212 via the check_mimetype function. This is due to incomplete file type validation in the check_mimetype function — while some extension checking is present, it can be bypassed, allowing attacker-supplied remote file content to be written with insufficient extension enforcement and no MIME check or WordPress upload helper. This makes it possible for authenticated attackers, with subscriber-level access and above, to upload files that may be executable, which makes remote code execution possible. Exploitation requires the plugin's 'profile videos on bio' option to be enabled, as this causes the nonce to be emitted on the subscriber-accessible profile page; without this setting, authenticated users below Editor cannot obtain the required nonce.
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-14 17:49 UTC
CWE
  • CWE-434 - Unrestricted Upload of File with Dangerous Type
Assigner
Wordfence CNA under the mitre root
CNA scorecard C 65/100 over 2451 records in the last 180 days details
Impacted products
Vendor Product Version
foliovision FV Flowplayer Video Player Affected: 0 , ≤ 7.5.54.7212 (semver)
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CVE-2026-86305 (GCVE-0-2026-86305)

Vulnerability from cvelistv5 – Published: 2026-09-07 12:45 – Updated: 2026-09-11 20:35
VLAI
Title
light0011 cms Upload.class.php upload unrestricted upload
Summary
A security flaw has been discovered in light0011 cms c774dce31c6df0055568a8d5c53d964d99be199d/f72cf46f601efb2a0618c3814cc2f61380b38930. Affected by this issue is the function Upload::upload of the file ThinkPHP/Library/Think/Upload.class.php. Performing a manipulation results in unrestricted upload. The attack is possible to be carried out remotely. The exploit has been released to the public and may be used for attacks. This product adopts a rolling release strategy to maintain continuous delivery. Therefore, version details for affected or updated releases cannot be specified. The project was informed of the problem early through an issue report but has not responded yet.
SSVC
Exploitation: poc Automatable: yes Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-11 20:02 UTC
CWE
Assigner
VulDB CNA under the mitre root
CNA scorecard B 83/100 over 3851 records in the last 180 days details
References
URL Tags
https://vuldb.com/vuln/399478 vdb-entrytechnical-description
https://vuldb.com/vuln/399478/cti signaturepermissions-required
https://vuldb.com/cve/CVE-2026-86305 third-party-advisory
https://vuldb.com/submit/894804 third-party-advisory
https://github.com/light0011/cms/issues/9 exploitissue-tracking
https://github.com/light0011/cms/ product
Impacted products
Vendor Product Version
light0011 cms Affected: c774dce31c6df0055568a8d5c53d964d99be199d
Affected: f72cf46f601efb2a0618c3814cc2f61380b38930
    cpe:2.3:a:light0011:cms:*:*:*:*:*:*:*:*
Create a notification for this product.
Show details on NVD website

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CVE-2026-86272 (GCVE-0-2026-86272)

Vulnerability from cvelistv5 – Published: 2026-09-07 04:45 – Updated: 2026-09-08 13:43
VLAI
Title
Beijing Meite Software Technology U+Smart Enjoyment WebSite UploadFormImg.ashx unrestricted upload
Summary
A vulnerability was determined in Beijing Meite Software Technology U+Smart Enjoyment WebSite 18.6001.1096.1000. This impacts an unknown function of the file /Report/Upload/UploadFormImg.ashx. Executing a manipulation of the argument File can lead to unrestricted upload. It is possible to launch the attack remotely. The exploit has been publicly disclosed and may be utilized.
SSVC
Exploitation: poc Automatable: yes Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-08 13:42 UTC
CWE
Assigner
VulDB CNA under the mitre root
CNA scorecard B 83/100 over 3851 records in the last 180 days details
References
URL Tags
https://vuldb.com/vuln/399431 vdb-entrytechnical-description
https://vuldb.com/vuln/399431/cti signaturepermissions-required
https://vuldb.com/cve/CVE-2026-86272 third-party-advisory
https://vuldb.com/submit/904145 third-party-advisory
https://ucn9h68n9289.feishu.cn/wiki/IYaowPR6licbC… exploit
Impacted products
Vendor Product Version
Beijing Meite Software Technology U+Smart Enjoyment WebSite Affected: 18.6001.1096.1000
    cpe:2.3:a:beijing_meite_software_technology:u_smart_enjoyment_website:*:*:*:*:*:*:*:*
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Show details on NVD website

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      "affected": [
        {
          "cpes": [
            "cpe:2.3:a:beijing_meite_software_technology:u_smart_enjoyment_website:*:*:*:*:*:*:*:*"
          ],
          "product": "U+Smart Enjoyment WebSite",
          "vendor": "Beijing Meite Software Technology",
          "versions": [
            {
              "status": "affected",
              "version": "18.6001.1096.1000"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "type": "reporter",
          "value": "red88-debug (VulDB User)"
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "A vulnerability was determined in Beijing Meite Software Technology U+Smart Enjoyment WebSite 18.6001.1096.1000. This impacts an unknown function of the file /Report/Upload/UploadFormImg.ashx. Executing a manipulation of the argument File can lead to unrestricted upload. It is possible to launch the attack remotely. The exploit has been publicly disclosed and may be utilized."
        }
      ],
      "metrics": [
        {
          "cvssV4_0": {
            "baseScore": 6.9,
            "baseSeverity": "MEDIUM",
            "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P",
            "version": "4.0"
          }
        },
        {
          "cvssV3_1": {
            "baseScore": 7.3,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L/E:P/RL:X/RC:R",
            "version": "3.1"
          }
        },
        {
          "cvssV3_0": {
            "baseScore": 7.3,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L/E:P/RL:X/RC:R",
            "version": "3.0"
          }
        },
        {
          "cvssV2_0": {
            "baseScore": 7.5,
            "vectorString": "AV:N/AC:L/Au:N/C:P/I:P/A:P/E:POC/RL:ND/RC:UR",
            "version": "2.0"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-434",
              "description": "Unrestricted Upload",
              "lang": "en",
              "type": "CWE"
            }
          ]
        },
        {
          "descriptions": [
            {
              "cweId": "CWE-284",
              "description": "Improper Access Controls",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-07T04:45:41.221Z",
        "orgId": "1af790b2-7ee1-4545-860a-a788eba489b5",
        "shortName": "VulDB"
      },
      "references": [
        {
          "name": "VDB-399431 | Beijing Meite Software Technology U+Smart Enjoyment WebSite UploadFormImg.ashx unrestricted upload",
          "tags": [
            "vdb-entry",
            "technical-description"
          ],
          "url": "https://vuldb.com/vuln/399431"
        },
        {
          "name": "VDB-399431 | CTI Indicators (IOB, IOC, TTP, IOA)",
          "tags": [
            "signature",
            "permissions-required"
          ],
          "url": "https://vuldb.com/vuln/399431/cti"
        },
        {
          "name": "CVE-2026-86272 | CVE Analysis and Report",
          "tags": [
            "third-party-advisory"
          ],
          "url": "https://vuldb.com/cve/CVE-2026-86272"
        },
        {
          "name": "Submit #904145 | Beijing Meite Software Technology Co., Ltd. U+Smart Enjoyment WebSite 18.6001.1096.1000  CWE-434 (Unrestricted Upload of File with Dangerous Type)",
          "tags": [
            "third-party-advisory"
          ],
          "url": "https://vuldb.com/submit/904145"
        },
        {
          "tags": [
            "exploit"
          ],
          "url": "https://ucn9h68n9289.feishu.cn/wiki/IYaowPR6licbC3kdw3xcJpQ7n6b?from=from_copylink"
        }
      ],
      "timeline": [
        {
          "lang": "en",
          "time": "2026-09-06T00:00:00.000Z",
          "value": "Advisory disclosed"
        },
        {
          "lang": "en",
          "time": "2026-09-06T02:00:00.000Z",
          "value": "VulDB entry created"
        },
        {
          "lang": "en",
          "time": "2026-09-06T14:57:09.000Z",
          "value": "VulDB entry last update"
        }
      ],
      "title": "Beijing Meite Software Technology U+Smart Enjoyment WebSite UploadFormImg.ashx unrestricted upload",
      "x_generator": [
        "VulDB PVTS v202609"
      ]
    }
  },
  "cveMetadata": {
    "assignerOrgId": "1af790b2-7ee1-4545-860a-a788eba489b5",
    "assignerShortName": "VulDB",
    "cveId": "CVE-2026-86272",
    "datePublished": "2026-09-07T04:45:41.221Z",
    "dateReserved": "2026-09-06T12:51:59.441Z",
    "dateUpdated": "2026-09-08T13:43:00.484Z",
    "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.