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

6652 vulnerabilities reference this CWE, most recent first.

CVE-2026-40487 (GCVE-0-2026-40487)

Vulnerability from cvelistv5 – Published: 2026-04-18 01:19 – Updated: 2026-04-20 15:25
VLAI
Title
Postiz Has Unrestricted File Upload via MIME Type Spoofing that Leads to Stored XSS
Summary
Postiz is an AI social media scheduling tool. Prior to version 2.21.6, a file upload validation bypass allows any authenticated user to upload arbitrary HTML, SVG, or other executable file types to the server by spoofing the `Content-Type` header. The uploaded files are then served by nginx with a Content-Type derived from their original extension (`text/html`, `image/svg+xml`), enabling Stored Cross-Site Scripting (XSS) in the context of the application's origin. This can lead to session riding, account takeover, and full compromise of other users' accounts. Version 2.21.6 contains a fix.
SSVC
Exploitation: poc Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-04-20 15:25 UTC
CWE
  • CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
  • CWE-345 - Insufficient Verification of Data Authenticity
  • CWE-434 - Unrestricted Upload of File with Dangerous Type
Assigner
GitHub_M CNA under the mitre root
CNA scorecard C 72/100 over 7831 records in the last 180 days details
References
Impacted products
Vendor Product Version
gitroomhq postiz-app Affected: < 2.21.6
Create a notification for this product.
Show details on NVD website

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CVE-2026-40484 (GCVE-0-2026-40484)

Vulnerability from cvelistv5 – Published: 2026-04-17 23:25 – Updated: 2026-04-20 14:56
VLAI
Title
ChurchCRM: Authenticated Remote Code Execution via Unrestricted PHP File Write in Database Restore Function
Summary
ChurchCRM is an open-source church management system. In versions prior to 7.2.0, the database backup restore functionality extracts uploaded archive contents and copies files from the Images/ directory into the web-accessible document root using recursiveCopyDirectory(), which performs no file extension filtering. An authenticated administrator can upload a crafted backup archive containing a PHP webshell inside the Images/ directory, which is then written to a publicly accessible path and executable via HTTP requests, resulting in remote code execution as the web server user. The restore endpoint also lacks CSRF token validation, enabling exploitation through cross-site request forgery targeting an authenticated administrator. This issue has been fixed in version 7.2.0.
SSVC
Exploitation: poc Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-04-20 14:45 UTC
CWE
  • CWE-269 - Improper Privilege Management
  • CWE-434 - Unrestricted Upload of File with Dangerous Type
  • CWE-552 - Files or Directories Accessible to External Parties
Assigner
GitHub_M CNA under the mitre root
CNA scorecard C 72/100 over 7831 records in the last 180 days details
Impacted products
Vendor Product Version
ChurchCRM CRM Affected: < 7.2.0
Create a notification for this product.
Show details on NVD website

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CVE-2026-40412 (GCVE-0-2026-40412)

Vulnerability from cvelistv5 – Published: 2026-05-22 22:03 – Updated: 2026-08-10 15:12 Exclusively Hosted Service
VLAI
Title
Azure Orbital Spatio Remote Code Execution Vulnerability
Summary
Unrestricted upload of file with dangerous type in Azure Orbital Spatio allows an unauthorized attacker to execute code over a network.
SSVC
Exploitation: none Automatable: yes Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-05-26 10:36 UTC
CWE
  • CWE-434 - Unrestricted Upload of File with Dangerous Type
Assigner
microsoft CNA under the mitre root
CNA scorecard B 82/100 over 4930 records in the last 180 days details
References
Impacted products
Vendor Product Version
Microsoft Azure Orbital Spatio Affected: -
    cpe:2.3:a:microsoft:azure_orbital_spatio:*:*:*:*:*:*:*:*
Create a notification for this product.
Date Public
2026-05-21 14:00
Show details on NVD website

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CVE-2026-40262 (GCVE-0-2026-40262)

Vulnerability from cvelistv5 – Published: 2026-04-16 23:51 – Updated: 2026-04-18 02:51
VLAI
Title
Note Mark has Stored XSS via Unrestricted Asset Upload
Summary
Note Mark is an open-source note-taking application. In versions 0.19.1 and prior, the asset delivery handler serves uploaded files inline and relies on magic-byte detection for content type, which does not identify text-based formats such as HTML, SVG, or XHTML. These files are served with an empty Content-Type, no X-Content-Type-Options: nosniff header, and inline disposition, allowing browsers to sniff and render active content. An authenticated user can upload an HTML or SVG file containing JavaScript as a note asset, and when a victim navigates to the asset URL, the script executes under the application's origin with access to the victim's authenticated session and API actions. This issue has been fixed in version 0.19.2.
SSVC
Exploitation: poc Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-04-18 02:50 UTC
CWE
  • CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
  • CWE-434 - Unrestricted Upload of File with Dangerous Type
Assigner
GitHub_M CNA under the mitre root
CNA scorecard C 72/100 over 7831 records in the last 180 days details
Impacted products
Vendor Product Version
enchant97 note-mark Affected: < 0.19.2
Create a notification for this product.
Show details on NVD website

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CVE-2026-40040 (GCVE-0-2026-40040)

Vulnerability from cvelistv5 – Published: 2026-04-13 18:10 – Updated: 2026-05-12 01:46
VLAI
Title
Pachno 1.0.6 Unrestricted File Upload Remote Code Execution
Summary
Pachno 1.0.6 contains an unrestricted file upload vulnerability that allows authenticated users to upload arbitrary file types by bypassing ineffective extension filtering to the /uploadfile endpoint. Attackers can upload executable files .php5 scripts to web-accessible directories and execute them to achieve remote code execution on the server.
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-04-14 13:08 UTC
CWE
  • CWE-434 - Unrestricted Upload of File with Dangerous Type
Assigner
VulnCheck CNA under the mitre root
CNA scorecard B 84/100 over 8140 records in the last 180 days details
References
Impacted products
Vendor Product Version
Pachno Pachno Affected: 1.0.6
    cpe:2.3:a:pachno:pachno:1.0.6:*:*:*:*:*:*:*
Create a notification for this product.
Date Public
2026-04-12 00:00
Show details on NVD website

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CVE-2026-39931 (GCVE-0-2026-39931)

Vulnerability from cvelistv5 – Published: 2026-08-03 15:54 – Updated: 2026-08-14 16:49 X_Open Source
VLAI
Title
OpenEMR Authenticated SQL Injection via backup.php Import Feature
Summary
OpenEMR through 8.2.0 contains an authenticated SQL injection vulnerability in the backup configuration import feature that allows administrators with admin or super ACL privileges to execute arbitrary DDL and DML statements against the application database by uploading a crafted SQL file at the form_step=202 parameter in backup.php. Attackers can exploit the unfiltered shell_exec invocation of the mysql command-line client to extract credential hashes, modify access control tables, inject backdoor accounts, create persistent triggers or stored procedures, and write arbitrary files to the filesystem where MySQL FILE privileges and permissive secure_file_priv settings are configured.
SSVC
Exploitation: poc Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-03 20:09 UTC
CWE
  • CWE-434 - Unrestricted Upload of File with Dangerous Type
Assigner
VulnCheck CNA under the mitre root
CNA scorecard B 84/100 over 8140 records in the last 180 days details
References
Impacted products
Vendor Product Version
openemr openemr Affected: 0 , ≤ 8.2.0 (semver)
    cpe:2.3:a:open-emr:openemr:*:*:*:*:*:*:*:*
Create a notification for this product.
Date Public
2026-08-02 00:00
Show details on NVD website

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CVE-2026-39770 (GCVE-0-2026-39770)

Vulnerability from cvelistv5 – Published: 2026-10-06 08:34 – Updated: 2026-10-06 10:31
VLAI
Title
WordPress Doctreat theme <= 1.7.0 - Arbitrary File Upload vulnerability
Summary
Unauthenticated Arbitrary File Upload in Doctreat <= 1.7.0 versions.
SSVC
Exploitation: none Automatable: yes Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-06 10:24 UTC
CWE
  • CWE-434 - Unrestricted Upload of File with Dangerous Type
Assigner
Patchstack CNA under the mitre root
CNA scorecard B 76/100 over 3590 records in the last 180 days details
References
Impacted products
Vendor Product Version
AmentoTech Doctreat Affected: n/a , ≤ 1.7.0 (custom)
Create a notification for this product.
Show details on NVD website

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CVE-2026-39759 (GCVE-0-2026-39759)

Vulnerability from cvelistv5 – Published: 2026-10-06 08:34 – Updated: 2026-10-06 10:31
VLAI
Title
WordPress Workreap Core plugin <= 3.4.5 - Arbitrary File Upload vulnerability
Summary
Employer / Sales Representative Arbitrary File Upload in Workreap Core <= 3.4.5 versions.
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-06 10:20 UTC
CWE
  • CWE-434 - Unrestricted Upload of File with Dangerous Type
Assigner
Patchstack CNA under the mitre root
CNA scorecard B 76/100 over 3590 records in the last 180 days details
References
Impacted products
Vendor Product Version
AmentoTech Workreap Core Affected: n/a , ≤ 3.4.5 (custom)
Create a notification for this product.
Show details on NVD website

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CVE-2026-39757 (GCVE-0-2026-39757)

Vulnerability from cvelistv5 – Published: 2026-10-06 08:34 – Updated: 2026-10-06 10:31
VLAI
Title
WordPress Taskbot plugin <= 6.6 - Arbitrary File Upload vulnerability
Summary
Subscriber Arbitrary File Upload in Taskbot <= 6.6 versions.
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-06 10:20 UTC
CWE
  • CWE-434 - Unrestricted Upload of File with Dangerous Type
Assigner
Patchstack CNA under the mitre root
CNA scorecard B 76/100 over 3590 records in the last 180 days details
References
Impacted products
Vendor Product Version
AmentoTech Taskbot Affected: n/a , ≤ 6.6 (custom)
Create a notification for this product.
Show details on NVD website

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CVE-2026-39755 (GCVE-0-2026-39755)

Vulnerability from cvelistv5 – Published: 2026-10-06 08:34 – Updated: 2026-10-06 10:31
VLAI
Title
WordPress WP Duplicate plugin <= 1.1.11 - Arbitrary File Upload vulnerability
Summary
Subscriber Arbitrary File Upload in WP Duplicate <= 1.1.11 versions.
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-06 10:21 UTC
CWE
  • CWE-434 - Unrestricted Upload of File with Dangerous Type
Assigner
Patchstack CNA under the mitre root
CNA scorecard B 76/100 over 3590 records in the last 180 days details
References
Impacted products
Vendor Product Version
revmakx WP Duplicate Affected: n/a , ≤ 1.1.11 (custom)
Create a notification for this product.
Show details on NVD website

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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.