Common Weakness Enumeration

CWE-1321

Allowed

Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')

Abstraction: Variant · Status: Incomplete

API response cwe.mitre.org

The product receives input from an upstream component that specifies attributes that are to be initialized or updated in an object, but it does not properly control modifications of attributes of the object prototype.

302 vulnerabilities reference this CWE, most recent first.

CVE-2026-107353 (GCVE-0-2026-107353)

Vulnerability from cvelistv5 – Published: 2026-10-07 19:35 – Updated: 2026-10-07 20:37
VLAI
Title
traverse: set() can write to built-in prototypes via an untrusted path
Summary
traverse (npm) versions 0.3.6 through 0.3.9, 0.4.0 through 0.4.6, 0.5.0 through 0.5.2, and 0.6.0 through 0.6.11 allow prototype pollution through set(). When the path passed to set() crosses a primitive value, the next path segment is resolved on that primitive's built-in prototype, so an application that passes an untrusted path to set() lets an attacker add or overwrite properties of String.prototype, Number.prototype, or Boolean.prototype using plain JSON data, for example traverse({ name: 'bob' }).set(['name', '__proto__', 'polluted'], 'yes'). Object.prototype was reachable only with a non-data path segment, such as an object whose toString returns a different value on each call, or through a Proxy that accepts an assignment without storing it. This is fixed in 0.3.10, 0.4.7, 0.5.3, and 0.6.12.
Severity
6.9 (Medium)
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N
6.5 (Medium)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L
SSVC
Exploitation: none Automatable: yes Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-07 20:36 UTC
CWE
  • CWE-1321 - Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')
Assigner
harborist CNA
References
Impacted products
Vendor Product Version
ljharb traverse Affected: 0.3.6 , < 0.3.10 (semver)
Affected: 0.4.0 , < 0.4.7 (semver)
Affected: 0.5.0 , < 0.5.3 (semver)
Affected: 0.6.0 , < 0.6.12 (semver)
Create a notification for this product.
Show details on NVD website
To clipboard 

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CVE-2026-107301 (GCVE-0-2026-107301)

Vulnerability from cvelistv5 – Published: 2026-10-08 17:13 – Updated: 2026-10-14 01:02
VLAI
Title
msgpack5: Partial options disable prototype protection
Summary
msgpack5 is a msgpack v5 implementation for node.js and the browser. Prior to 6.1.0, constructing msgpack5 with an empty or partial options object disables the default protoAction: 'error' protection. A decoded map containing a __proto__ key can then replace the decoded object's prototype, potentially changing inherited properties or downstream behavior, although Object.prototype is not modified globally. This issue is fixed in version 6.1.0.
Severity
6.5 (Medium)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:L
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-14 01:02 UTC
CWE
  • CWE-1321 - Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')
Assigner
GitHub_M CNA
References
Impacted products
Vendor Product Version
mcollina msgpack5 Affected: < 6.1.0
Create a notification for this product.
Show details on NVD website
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CVE-2026-106448 (GCVE-0-2026-106448)

Vulnerability from cvelistv5 – Published: 2026-10-06 19:45 – Updated: 2026-10-07 17:07
VLAI
Title
StableLib: Prototype poisoning via `__proto__` map keys in CBOR decoding
Summary
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Severity
8.9 (High)
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:H/SA:N
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-07 15:27 UTC
CWE
  • CWE-1321 - Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')
Assigner
GitHub_M CNA
References
Impacted products
Vendor Product Version
StableLib stablelib Affected: < 2.0.4
Create a notification for this product.
Show details on NVD website
To clipboard 

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CVE-2026-106160 (GCVE-0-2026-106160)

Vulnerability from cvelistv5 – Published: 2026-10-15 13:24 – Updated: 2026-10-15 18:26
VLAI
Title
Prototype Pollution via Model.accept and kendo.setter in Kendo UI for jQuery
Summary
In Progress® Kendo® UI for jQuery prior to 2026.3.1015, Model.accept passes server-response keys to kendo.setter without guarding against unsafe object paths containing __proto__, constructor, or prototype. An attacker who can supply data accepted by an affected model can modify object prototype attributes and influence application behavior, potentially compromising the confidentiality and integrity of application data. The impact depends on how the application uses the modified objects, including in server-side JavaScript scenarios. The earliest affected version has not been confirmed. This issue is fixed in version 2026.3.1015.
Severity
5.4 (Medium)
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-15 18:26 UTC
CWE
  • CWE-1321 - Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')
Assigner
References
Impacted products
Vendor Product Version
Progress Software Kendo UI for jQuery Affected: 2023.1.117 , < 2026.3.1015 (custom)
Unaffected: 2026.3.1015
Create a notification for this product.
Credits
Abhishek Nandkumar Bhaskar (Abhi-Hackz)
Show details on NVD website
To clipboard 

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CVE-2026-106144 (GCVE-0-2026-106144)

Vulnerability from cvelistv5 – Published: 2026-11-06 16:59 – Updated: 2026-11-06 17:46
VLAI
Title
Prototype Pollution in Progress Software Kendo UI for Angular
Summary
Prototype Pollution in the Scheduler component (@progress/kendo-angular-scheduler and @progress/kendo-angular-common) in Progress Software Kendo UI for Angular versions prior to 25.1.0 allows a high-privileged attacker who can control a field path processed by the Scheduler to modify the prototype of built-in objects, resulting in a limited impact on confidentiality, integrity, and availability.
Severity
4.1 (Medium)
CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:L/I:L/A:L
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-11-06 17:17 UTC
CWE
  • CWE-1321 - Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')
Assigner
References
Impacted products
Credits
Cyberkareem
Show details on NVD website
To clipboard 

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CVE-2026-106128 (GCVE-0-2026-106128)

Vulnerability from cvelistv5 – Published: 2026-11-06 17:01 – Updated: 2026-11-06 20:36
VLAI
Title
Prototype Pollution in Progress Software Kendo UI for Vue
Summary
Prototype Pollution in @progress/kendo-vue-common in Progress Software Kendo UI for Vue versions 0.4.0 through 9.2.0 allows a high-privileged attacker who can control a field path processed by components such as the Scheduler to modify the prototype of built-in objects, resulting in a limited impact on confidentiality, integrity, and availability.
Severity
4.1 (Medium)
CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:L/I:L/A:L
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-11-06 20:36 UTC
CWE
  • CWE-1321 - Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')
Assigner
References
Impacted products
Vendor Product Version
Progress Software Kendo UI for Vue Affected: 0.4.0 , < 10.0.0 (semver)
Create a notification for this product.
Credits
Cyberkareem
Show details on NVD website
To clipboard 

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CVE-2026-106127 (GCVE-0-2026-106127)

Vulnerability from cvelistv5 – Published: 2026-11-06 17:00 – Updated: 2026-11-06 17:47
VLAI
Title
Prototype Pollution in Progress Software KendoReact
Summary
Prototype Pollution in the setter utility (@progress/kendo-react-common) in Progress Software KendoReact versions 3.5.0 through 16.0.0 allows a high-privileged attacker who can control a field path passed to the utility, directly or through components such as the Form, Scheduler, and Gantt, to modify the prototype of built-in objects, resulting in a limited impact on confidentiality, integrity, and availability.
Severity
4.1 (Medium)
CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:L/I:L/A:L
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-11-06 17:17 UTC
CWE
  • CWE-1321 - Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')
Assigner
References
Impacted products
Vendor Product Version
Progress Software KendoReact Affected: 3.5.0 , < 16.1.0 (semver)
Create a notification for this product.
Credits
Cyberkareem
Show details on NVD website
To clipboard 

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CVE-2026-105858 (GCVE-0-2026-105858)

Vulnerability from cvelistv5 – Published: 2026-10-06 16:29 – Updated: 2026-10-09 01:14
VLAI
Title
Payload: Remote Code Execution through first-register
Summary
Payload is a free and open source headless content management system. In versions before 3.90.0 and canary versions before 4.0.0-canary.34, a crafted request to the public first-register operation can execute code remotely when local authentication is enabled and no initial user has been created. This issue is fixed in versions 3.90.0 and 4.0.0-canary.34.
Severity
8.1 (High)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-09 01:13 UTC
CWE
  • CWE-94 - Improper Control of Generation of Code ('Code Injection')
  • CWE-1321 - Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')
Assigner
GitHub_M CNA
References
Impacted products
Vendor Product Version
payloadcms payload Affected: < 3.90.0
Affected: >= 4.0.0-canary.0, < 4.0.0-canary.34
Create a notification for this product.
Show details on NVD website
To clipboard 

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CVE-2026-105857 (GCVE-0-2026-105857)

Vulnerability from cvelistv5 – Published: 2026-10-06 16:26 – Updated: 2026-10-06 17:23
VLAI
Title
Payload: RCE in Payload Form Builder
Summary
Payload is a free and open source headless content management system. In @payloadcms/plugin-form-builder versions before 3.90.0 and canary versions before 4.0.0-canary.34, an attacker can craft a form submission that executes code remotely on the server. This issue is fixed in versions 3.90.0 and 4.0.0-canary.34.
Severity
10 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
SSVC
Exploitation: none Automatable: yes Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-06 17:23 UTC
CWE
  • CWE-94 - Improper Control of Generation of Code ('Code Injection')
  • CWE-1321 - Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')
Assigner
GitHub_M CNA
References
Impacted products
Vendor Product Version
payloadcms payload Affected: < 3.90.0
Affected: >= 4.0.0-canary.0, < 4.0.0-canary.34
Create a notification for this product.
Show details on NVD website
To clipboard 

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CVE-2026-105844 (GCVE-0-2026-105844)

Vulnerability from cvelistv5 – Published: 2026-10-06 15:57 – Updated: 2026-10-09 01:08
VLAI
Title
Payload: Prototype pollution in Payload Import Export plugin
Summary
Payload is a free and open source headless content management system. In versions from 3.0.0 before 3.88.0 and canary versions before 4.0.0-canary.27, an unauthenticated user can submit prototype-sensitive field paths when @payloadcms/plugin-import-export is enabled, causing unintended application behavior that can lead to remote code execution. This issue is fixed in versions 3.88.0 and 4.0.0-canary.27.
Severity
9.3 (Critical)
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
SSVC
Exploitation: none Automatable: yes Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-09 01:08 UTC
CWE
  • CWE-1321 - Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')
Assigner
GitHub_M CNA
References
Impacted products
Vendor Product Version
payloadcms payload Affected: >= 3.0.0, < 3.88.0
Affected: >= 4.0.0-canary.0, < 4.0.0-canary.27
Create a notification for this product.
@payloadcms plugin-import-export Affected: >= 3.0.0, < 3.88.0
Affected: >= 4.0.0-canary.0, < 4.0.0-canary.27
Create a notification for this product.
Show details on NVD website
To clipboard 

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Mitigation
Implementation

By freezing the object prototype first (for example, Object.freeze(Object.prototype)), modification of the prototype becomes impossible.

Mitigation
Architecture and Design

By blocking modifications of attributes that resolve to object prototype, such as proto or prototype, this weakness can be mitigated.

Mitigation
Implementation

Strategy: Input Validation

When handling untrusted objects, validating using a schema can be used.

Mitigation
Implementation

By using an object without prototypes (via Object.create(null) ), adding object prototype attributes by accessing the prototype via the special attributes becomes impossible, mitigating this weakness.

Mitigation
Implementation

Map can be used instead of objects in most cases. If Map methods are used instead of object attributes, it is not possible to access the object prototype or modify it.

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.

CAPEC-180: Exploiting Incorrectly Configured Access Control Security Levels

An attacker exploits a weakness in the configuration of access controls and is able to bypass the intended protection that these measures guard against and thereby obtain unauthorized access to the system or network. Sensitive functionality should always be protected with access controls. However configuring all but the most trivial access control systems can be very complicated and there are many opportunities for mistakes. If an attacker can learn of incorrectly configured access security settings, they may be able to exploit this in an attack.

CAPEC-77: Manipulating User-Controlled Variables

This attack targets user controlled variables (DEBUG=1, PHP Globals, and So Forth). An adversary can override variables leveraging user-supplied, untrusted query variables directly used on the application server without any data sanitization. In extreme cases, the adversary can change variables controlling the business logic of the application. For instance, in languages like PHP, a number of poorly set default configurations may allow the user to override variables.

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