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⇱ CWE - CWE-349: Acceptance of Extraneous Untrusted Data With Trusted Data (4.20)

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Home > CWE List > CWE-349: Acceptance of Extraneous Untrusted Data With Trusted Data (4.20)  
CWE Glossary Definition
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CWE-349: Acceptance of Extraneous Untrusted Data With Trusted Data

Weakness ID: 349
Vulnerability Mapping: ALLOWED This CWE ID may be used to map to real-world vulnerabilities
Abstraction: Base Base - a weakness that is still mostly independent of a resource or technology, but with sufficient details to provide specific methods for detection and prevention. Base level weaknesses typically describe issues in terms of 2 or 3 of the following dimensions: behavior, property, technology, language, and resource.
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Description
The product, when processing trusted data, accepts any untrusted data that is also included with the trusted data, treating the untrusted data as if it were trusted.
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Common Consequences
👁 Section Help
This table specifies different individual consequences associated with the weakness. The Scope identifies the application security area that is violated, while the Impact describes the negative technical impact that arises if an adversary succeeds in exploiting this weakness. The Likelihood provides information about how likely the specific consequence is expected to be seen relative to the other consequences in the list. For example, there may be high likelihood that a weakness will be exploited to achieve a certain impact, but a low likelihood that it will be exploited to achieve a different impact.
Impact Details

Bypass Protection Mechanism; Modify Application Data

Scope: Access Control, Integrity
An attacker could package untrusted data with trusted data to bypass protection mechanisms to gain access to and possibly modify sensitive data.
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 Relationships
👁 Section Help
This table shows the weaknesses and high level categories that are related to this weakness. These relationships are defined as ChildOf, ParentOf, MemberOf and give insight to similar items that may exist at higher and lower levels of abstraction. In addition, relationships such as PeerOf and CanAlsoBe are defined to show similar weaknesses that the user may want to explore.
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Relevant to the view "Research Concepts" (View-1000)
Nature Type ID Name
ChildOf 👁 Class
Class - a weakness that is described in a very abstract fashion, typically independent of any specific language or technology. More specific than a Pillar Weakness, but more general than a Base Weakness. Class level weaknesses typically describe issues in terms of 1 or 2 of the following dimensions: behavior, property, and resource. 		345 Insufficient Verification of Data Authenticity
PeerOf 👁 Base
Base - a weakness that is still mostly independent of a resource or technology, but with sufficient details to provide specific methods for detection and prevention. Base level weaknesses typically describe issues in terms of 2 or 3 of the following dimensions: behavior, property, technology, language, and resource. 		501 Trust Boundary Violation
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Relevant to the view "Software Development" (View-699)
Nature Type ID Name
MemberOf 👁 Category
Category - a CWE entry that contains a set of other entries that share a common characteristic. 		1214 Data Integrity Issues
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Relevant to the view "Architectural Concepts" (View-1008)
Nature Type ID Name
MemberOf 👁 Category
Category - a CWE entry that contains a set of other entries that share a common characteristic. 		1019 Validate Inputs
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Modes Of Introduction
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The different Modes of Introduction provide information about how and when this weakness may be introduced. The Phase identifies a point in the life cycle at which introduction may occur, while the Note provides a typical scenario related to introduction during the given phase.
Phase Note
Implementation
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Applicable Platforms
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This listing shows possible areas for which the given weakness could appear. These may be for specific named Languages, Operating Systems, Architectures, Paradigms, Technologies, or a class of such platforms. The platform is listed along with how frequently the given weakness appears for that instance.
Languages

Class: Not Language-Specific (Undetermined Prevalence)

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Selected Observed Examples

Note: this is a curated list of examples for users to understand the variety of ways in which this weakness can be introduced. It is not a complete list of all CVEs that are related to this CWE entry.

Reference Description
Does not verify that trusted entity is authoritative for all entities in its response.
use of extra data in a signature allows certificate signature forging
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Weakness Ordinalities
Ordinality Description
Primary
(where the weakness exists independent of other weaknesses)
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Memberships
👁 Section Help
This MemberOf Relationships table shows additional CWE Categories and Views that reference this weakness as a member. This information is often useful in understanding where a weakness fits within the context of external information sources.
Nature Type ID Name
MemberOf 👁 Category
Category - a CWE entry that contains a set of other entries that share a common characteristic.		 860 The CERT Oracle Secure Coding Standard for Java (2011) Chapter 17 - Runtime Environment (ENV)
MemberOf 👁 View
View - a subset of CWE entries that provides a way of examining CWE content. The two main view structures are Slices (flat lists) and Graphs (containing relationships between entries).		 884 CWE Cross-section
MemberOf 👁 Category
Category - a CWE entry that contains a set of other entries that share a common characteristic.		 977 SFP Secondary Cluster: Design
MemberOf 👁 Category
Category - a CWE entry that contains a set of other entries that share a common characteristic.		 1150 SEI CERT Oracle Secure Coding Standard for Java - Guidelines 16. Runtime Environment (ENV)
MemberOf 👁 Category
Category - a CWE entry that contains a set of other entries that share a common characteristic.		 1365 ICS Communications: Unreliability
MemberOf 👁 Category
Category - a CWE entry that contains a set of other entries that share a common characteristic.		 1366 ICS Communications: Frail Security in Protocols
MemberOf 👁 Category
Category - a CWE entry that contains a set of other entries that share a common characteristic.		 1373 ICS Engineering (Construction/Deployment): Trust Model Problems
MemberOf 👁 Category
Category - a CWE entry that contains a set of other entries that share a common characteristic.		 1411 Comprehensive Categorization: Insufficient Verification of Data Authenticity
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Vulnerability Mapping Notes
Usage ALLOWED
(this CWE ID may be used to map to real-world vulnerabilities)
Reason Acceptable-Use

Rationale

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.

Comments

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.
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Taxonomy Mappings
Mapped Taxonomy Name Node ID Fit Mapped Node Name
PLOVER Untrusted Data Appended with Trusted Data
The CERT Oracle Secure Coding Standard for Java (2011) ENV01-J Place all security-sensitive code in a single JAR and sign and seal it
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Content History
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Submissions
Submission Date Submitter Organization
2006-07-19
(CWE Draft 3, 2006-07-19) 		PLOVER
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Modifications
Modification Date Modifier Organization
2025-12-11
(CWE 4.19, 2025-12-11) 		CWE Content Team MITRE
updated Relationships, Weakness_Ordinalities
2023-06-29
(CWE 4.12, 2023-06-29) 		CWE Content Team MITRE
updated Mapping_Notes, Relationships
2023-04-27
(CWE 4.11, 2023-04-27) 		CWE Content Team MITRE
updated Modes_of_Introduction, Relationships, Time_of_Introduction
2023-01-31
(CWE 4.10, 2023-01-31) 		CWE Content Team MITRE
updated Description
2022-04-28
(CWE 4.7, 2022-04-28) 		CWE Content Team MITRE
updated Relationships
2020-06-25
(CWE 4.1, 2020-06-25) 		CWE Content Team MITRE
updated Observed_Examples, Relationships
2020-02-24
(CWE 4.0, 2020-02-24) 		CWE Content Team MITRE
updated Relationships
2019-01-03
(CWE 3.2, 2019-01-03) 		CWE Content Team MITRE
updated Relationships, Taxonomy_Mappings
2017-11-08
(CWE 3.0, 2017-11-08) 		CWE Content Team MITRE
updated Applicable_Platforms, Modes_of_Introduction, Relationships
2014-07-30
(CWE 2.8, 2014-07-31) 		CWE Content Team MITRE
updated Relationships
2012-05-11
(CWE 2.2, 2012-05-15) 		CWE Content Team MITRE
updated Common_Consequences, Related_Attack_Patterns, Relationships, Taxonomy_Mappings
2011-06-01
(CWE 1.13, 2011-06-01) 		CWE Content Team MITRE
updated Common_Consequences, Relationships, Taxonomy_Mappings
2008-09-08
(CWE 1.0, 2008-09-09) 		CWE Content Team MITRE
updated Relationships, Taxonomy_Mappings
2008-07-01
(CWE 1.0, 2008-09-09) 		Eric Dalci Cigital
updated Time_of_Introduction
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Previous Entry Names
Change Date Previous Entry Name
2008-04-11 Untrusted Data Appended with Trusted Data
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Page Last Updated: April 30, 2026

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