Common Weakness Enumeration

CWE-1321

Allowed

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

Abstraction: Variant · Status: Incomplete

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.

852 vulnerabilities reference this CWE, most recent first.

CVE-2026-25754 (GCVE-0-2026-25754)

Vulnerability from cvelistv5 – Published: 2026-02-06 22:48 – Updated: 2026-02-09 15:26
VLAI
Title
AdonisJS multipart body parsing has Prototype Pollution issue
Summary
AdonisJS is a TypeScript-first web framework. Prior to versions 10.1.3 and 11.0.0-next.9, a prototype pollution vulnerability in AdonisJS multipart form-data parsing may allow a remote attacker to manipulate object prototypes at runtime. This issue has been patched in versions 10.1.3 and 11.0.0-next.9.
SSVC
Exploitation: none Automatable: yes Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-02-09 15:21 UTC
CWE
  • CWE-1321 - Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')
Impacted products
Vendor Product Version
adonisjs core Affected: < 10.1.3
Affected: < 11.0.0-next.9
Create a notification for this product.
Show details on NVD website

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CVE-2026-25521 (GCVE-0-2026-25521)

Vulnerability from cvelistv5 – Published: 2026-02-04 21:20 – Updated: 2026-07-15 02:49
VLAI
Title
Locutus is vulnerable to Prototype Pollution
Summary
Locutus brings stdlibs of other programming languages to JavaScript for educational purposes. In versions from 2.0.12 to before 2.0.39, a prototype pollution vulnerability exists in locutus. Despite a previous fix that attempted to mitigate prototype pollution by checking whether user input contained a forbidden key, it is still possible to pollute Object.prototype via a crafted input using String.prototype. This issue has been patched in version 2.0.39.
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-02-05 14:23 UTC
CWE
  • CWE-1321 - Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')
  • CWE-915 - Improperly Controlled Modification of Dynamically-Determined Object Attributes
Impacted products
Show details on NVD website

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CVE-2026-25150 (GCVE-0-2026-25150)

Vulnerability from cvelistv5 – Published: 2026-02-03 21:12 – Updated: 2026-02-04 16:31
VLAI
Title
Prototype Pollution via FormData Processing in Qwik City
Summary
Qwik is a performance focused javascript framework. Prior to version 1.19.0, a prototype pollution vulnerability exists in the formToObj() function within @builder.io/qwik-city middleware. The function processes form field names with dot notation (e.g., user.name) to create nested objects, but fails to sanitize dangerous property names like __proto__, constructor, and prototype. This allows unauthenticated attackers to pollute Object.prototype by sending crafted HTTP POST requests, potentially leading to privilege escalation, authentication bypass, or denial of service. This issue has been patched in version 1.19.0.
SSVC
Exploitation: none Automatable: yes Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-02-04 16:31 UTC
CWE
  • CWE-1321 - Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')
References
Impacted products
Vendor Product Version
QwikDev qwik Affected: < 1.19.0
Create a notification for this product.
Show details on NVD website

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CVE-2026-25047 (GCVE-0-2026-25047)

Vulnerability from cvelistv5 – Published: 2026-01-29 21:39 – Updated: 2026-02-02 16:35
VLAI
Title
deepHas vulnerable to Prototype Pollution via constructor.prototype
Summary
deepHas provides a test for the existence of a nested object key and optionally returns that key. A prototype pollution vulnerability exists in version 1.0.7 of the deephas npm package that allows an attacker to modify global object behavior. This issue was fixed in version 1.0.8.
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-01-30 14:48 UTC
CWE
  • CWE-1321 - Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')
References
Impacted products
Vendor Product Version
sharpred deepHas Affected: < 1.0.7
Create a notification for this product.
Show details on NVD website

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CVE-2026-24888 (GCVE-0-2026-24888)

Vulnerability from cvelistv5 – Published: 2026-01-28 21:35 – Updated: 2026-01-29 18:00
VLAI
Title
Maker.js Vulnerable to Unsafe Property Copying in makerjs.extendObject
Summary
Maker.js is a 2D vector line drawing and shape modeling for CNC and laser cutters. In versions up to and including 0.19.1, the `makerjs.extendObject` function copies properties from source objects without proper validation, potentially exposing applications to security risks. The function lacks `hasOwnProperty()` checks and does not filter dangerous keys, allowing inherited properties and potentially malicious properties to be copied to target objects. A patch is available in commit 85e0f12bd868974b891601a141974f929dec36b8, which is expected to be part of version 0.19.2.
SSVC
Exploitation: poc Automatable: yes Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-01-29 16:02 UTC
CWE
  • CWE-1321 - Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')
Impacted products
Vendor Product Version
microsoft maker.js Affected: <= 0.19.1
Create a notification for this product.
Show details on NVD website

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CVE-2026-24766 (GCVE-0-2026-24766)

Vulnerability from cvelistv5 – Published: 2026-01-28 20:27 – Updated: 2026-01-29 18:01
VLAI
Title
NocoDB Vulnerable to Prototype Pollution in Connection Test Endpoint, Leading to DoS
Summary
NocoDB is software for building databases as spreadsheets. Prior to version 0.301.0, an authenticated user with org-level-creator permissions can exploit prototype pollution in the `/api/v2/meta/connection/test` endpoint, causing all database write operations to fail application-wide until server restart. While the pollution technically bypasses SUPER_ADMIN authorization checks, no practical privileged actions can be performed because database operations fail immediately after pollution. Version 0.301.0 patches the issue.
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-01-29 16:03 UTC
CWE
  • CWE-1321 - Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')
References
Impacted products
Vendor Product Version
nocodb nocodb Affected: < 0.301.0
Create a notification for this product.
Show details on NVD website

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CVE-2026-23929 (GCVE-0-2026-23929)

Vulnerability from cvelistv5 – Published: 2026-08-18 12:16 – Updated: 2026-08-19 03:55
VLAI
Title
Prototype pollution leading to stored XSS
Summary
Prototype pollution vulnerability in searchParamsToObject() is leading to a persistent XSS in Maps. URL parameter processing was not filtering dangerous properties like __proto__, combined with jQuery's unsafe element creation that traversed the prototype chain.
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-18 00:00 UTC
CWE
  • CWE-1321 - Improperly Controlled Modification of Object Prototype Attributes ("Prototype Pollution")
References
Impacted products
Vendor Product Version
Zabbix Zabbix Affected: 6.0.44 , ≤ 6.0.45 (git)
Affected: 7.0.22 , ≤ 7.0.24 (git)
Affected: 7.4.6 , ≤ 7.4.8 (git)
Create a notification for this product.
Show details on NVD website

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CVE-2026-23736 (GCVE-0-2026-23736)

Vulnerability from cvelistv5 – Published: 2026-01-21 23:01 – Updated: 2026-01-22 14:45
VLAI
Title
seroval Affected by Prototype Pollution via JSON Deserialization
Summary
seroval facilitates JS value stringification, including complex structures beyond JSON.stringify capabilities. In versions 1.4.0 and below, due to improper input validation, a malicious object key can lead to prototype pollution during JSON deserialization. This vulnerability affects only JSON deserialization functionality. This issue is fixed in version 1.4.1.
SSVC
Exploitation: none Automatable: yes Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-01-22 14:45 UTC
CWE
  • CWE-1321 - Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')
References
Impacted products
Vendor Product Version
lxsmnsyc seroval Affected: < 1.4.1
Create a notification for this product.
Show details on NVD website

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CVE-2026-21854 (GCVE-0-2026-21854)

Vulnerability from cvelistv5 – Published: 2026-01-07 18:14 – Updated: 2026-01-07 18:41
VLAI
Title
Tarkov Data Manager Authentication Bypass vulnerability
Summary
The Tarkov Data Manager is a tool to manage the Tarkov item data. Prior to 02 January 2025, an authentication bypass vulnerability in the login endpoint allows any unauthenticated user to gain full admin access to the Tarkov Data Manager admin panel by exploiting a JavaScript prototype property access vulnerability, combined with loose equality type coercion. A series of fix commits on 02 January 2025 fixed this and other vulnerabilities.
SSVC
Exploitation: poc Automatable: yes Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-01-07 18:40 UTC
CWE
  • CWE-287 - Improper Authentication
  • CWE-843 - Access of Resource Using Incompatible Type ('Type Confusion')
  • CWE-1321 - Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')
References
Impacted products
Show details on NVD website

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GCVE-1-2026-20118 (CVE-2026-66922)

Vulnerability from gna-1 – Published: 2026-07-28 13:19 – Updated: 2026-07-28 13:20
VLAI
Title
Pivotick Prototype-Key Collision in Tree Layout and Cycle Detection Allows Graph Manipulation and Denial of Service
Summary
Pivotick used plain JavaScript objects as lookup tables indexed by caller-controlled graph node identifiers in its tree-layout and cycle-detection components. Node identifiers matching properties inherited from Object.prototype, such as constructor, toString, or __proto__, were not handled as ordinary identifiers. These values could be interpreted as existing inherited properties, resolve to values of an unexpected type, or—in the case of __proto__ assignments—modify the prototype of an internal lookup object. An attacker who can supply graph data containing crafted node identifiers could consequently cause nodes or edges to be silently omitted, produce incorrect hierarchy levels, bypass or corrupt cycle-detection results, or trigger an exception that interrupts graph processing and rendering. This affects the integrity of graph visualisations and analytics and may cause a client-side denial-of-service condition. The affected code also failed to safely handle edges whose source node was absent from the supplied node set. Furthermore, calculating the maximum tree depth by spreading all level values into Math.max() could exceed the JavaScript function-argument limit when processing a sufficiently large graph, resulting in an exception and denial of service. The patch replaces identifier-keyed plain objects with Map instances, ignores invalid edges during tree construction, and calculates the maximum depth iteratively.
CWE
  • CWE-1321 - Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')
Assigner
References
Impacted products
Vendor Product Version
pivotick pivotick Affected: 0 , ≤ 1.4.0 (semver)
Create a notification for this product.
Relationships

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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.