Weakness (CWE)
CWE-1321: Improperly Controlled Modification of Object Prototype Attributes
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.
How to prevent it (5 mitigations)
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Implementation
By freezing the object prototype first (for example, Object.freeze(Object.prototype)), modification of the prototype becomes impossible.
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Architecture and Design
By blocking modifications of attributes that resolve to object prototype, such as proto or prototype, this weakness can be mitigated.
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Implementation
When handling untrusted objects, validating using a schema can be used.
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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.
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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.
Source: MITRE CWE-1321
212 results · Clear filters · Feed
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Medium 5.6
Quasar Framework: Prototype pollution in Quasar extend() utility
Quasar Framework is a framework for building high-performance Vue.js user interfaces. Prior to 2.22.0, the public extend() utility in ui/src/utils/extend/extend.js recursively copied attacker-controlled object keys during extend(true, target, source) deep mer…
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Medium 6.5
Mongoose: Prototype pollution in the update casting via __proto__-prefixed dotted path (Schema._getSchema/path getter)
Mongoose is a MongoDB object modeling tool designed to work in an asynchronous environment. Prior to 6.13.10, 7.8.10, 8.24.1, and 9.7.2, passing a user-controlled update such as MyModel.updateOne(filter, req.body) can exploit Mongoose update casting with a __…
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Medium 6.1
n8n before 1.123.67 Prototype Pollution via VM Expression Engine
n8n before 1.123.67, 2.31.5, and 2.32.1 contains a prototype pollution vulnerability in the VM expression engine. An authenticated user able to create or edit a workflow expression can abuse the engine's array-element access to obtain a reference to a host bu…
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Medium 6.5
Mermaid Architecture diagrams are vulnerable to prototype pollution
Mermaid is a JavaScript tool that uses Markdown-inspired text to create and modify diagrams and charts. From version 11.5.0 until 11.16.1, Mermaid Architecture Diagrams are vulnerable to prototype pollution when a diagram defines a group with an id of __proto…
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Medium 5.4
Electron: contextBridge object copy honors prototype setters
Electron is a framework for writing cross-platform desktop applications using JavaScript, HTML and CSS. Prior to 39.8.9, 40.9.2, 41.2.2, and 42.0.0-beta.4, objects copied across the contextBridge boundary from untrusted content could carry an attacker-influen…
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Medium 5.7
In Eclipse Theia versions 0.7.0 and up until including 1.73.1, the `PreferenceUtils.merge` function in `@theia/core` re…
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Medium 6.3
axios before 1.18.0 Prototype Pollution via bodyless methods
axios is vulnerable to read-side prototype-pollution gadgets that can alter request construction when Object.prototype has already been polluted by a separate vulnerability or dependency. In the bodyless method aliases (axios.get(), axios.delete(), axios.head…
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Medium 6.3
axios before 0.33.0 Prototype Pollution via nested option objects
axios before 0.33.0 (and 1.x before 1.18.0) can consume inherited properties from nested request option objects when the JavaScript process's Object.prototype has already been polluted by another component. While the top-level merged config uses a null protot…
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Medium 6.3
axios before 1.18.0 Prototype Pollution via auth subfields
axios versions >=1.15.2 and <1.18.0 contain prototype-pollution read-side gadgets in Basic auth subfield handling (lib/adapters/http.js and lib/helpers/resolveConfig.js). When an application is already affected by a separate prototype-pollution primitive and …
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Medium 5.1
Pivotick Prototype-Key Collision in Tree Layout and Cycle Detection Allows Graph Manipulation and Denial of Service
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,…
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Medium 6.1
DOMPurify before 3.3.2 Prototype Pollution via USE_PROFILES
DOMPurify before 3.3.2 contains a prototype pollution vulnerability in USE_PROFILES mode that allows attackers to bypass attribute filtering by polluting Array.prototype properties. Attackers can set Array.prototype properties like onclick to true, causing DO…
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Medium 4.0
Versions of the package mongo-object before 3.0.3 are vulnerable to Prototype Pollution via the expandKey() function in…
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Medium 4.6
FreeScout vulnerable to prototype pollution in getQueryParam
FreeScout is a free help desk and shared inbox built with PHP's Laravel framework. A Prototype Pollution condition in the `getQueryParam` function `/public/js/main.js` and was addressed in version 1.8.139 by blocking URL query keys matching the pattern `__pro…
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Medium 6.3
CartoDB carto-api-client filters.ts addFilter prototype pollution
A vulnerability has been found in CartoDB carto-api-client 0.5.29. This impacts the function addFilter of the file src/filters.ts. Such manipulation of the argument column leads to improperly controlled modification of object prototype attributes. The attack …
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Medium 6.3
RobinHerbots Inputmask Internal Deep Merge Helper extend.js extendAliases prototype pollution
A vulnerability was found in RobinHerbots Inputmask up to 5.0.9. Affected by this issue is the function extendDefaults/extendDefinitions/extendAliases in the library lib/dependencyLibs/extend.js of the component Internal Deep Merge Helper. The manipulation re…
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Medium 4.8
Hey API: `buildClientParams` template: prototype chain substitution via unknown `$<slot>___proto__` key
Hey API is an ecosystem for turning API specifications into production-ready code. Prior to 0.97.3, dist/clients/core/params.ts ships a runtime template copied into generated SDKs as params.gen.ts, and buildClientParams writes unknown slot-prefixed keys such …
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Medium 6.3
sagold json-schema-library propertyDependencies.ts parsePropertyDependencies prototype pollution
A security vulnerability has been detected in sagold json-schema-library 11.5.0/11.5.1. This impacts the function parsePropertyDependencies of the file src/keywords/propertyDependencies.ts. The manipulation leads to improperly controlled modification of objec…
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Medium 6.1
DOMPurify: IN_PLACE mode preserves attributes of a clobbered root element, allowing XSS via attacker-controlled root DOM
DOMPurify is a DOM-only cross-site scripting sanitizer for HTML, MathML, and SVG. Prior to 3.4.6, DOMPurify.sanitize(root, { IN_PLACE: true }) could preserve event-handler attributes on an attacker-controlled <form> root when a descendant name clobbered prope…
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Medium 6.3
tamagui config.ts updateConfig prototype pollution
A security vulnerability has been detected in tamagui up to 2.3.0. This affects the function updateConfig of the file code/core/web/src/config.ts. Such manipulation leads to improperly controlled modification of object prototype attributes. The attack may be …
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Medium 6.3
spencermountain compromise Public Root API extend.js nlp.extend prototype pollution
A vulnerability was identified in spencermountain compromise up to 14.15.1. Affected is the function nlp.extend of the file src/API/extend.js of the component Public Root API. The manipulation of the argument plugin leads to improperly controlled modification…
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Medium 6.3
kofrasa mingo Update API updateMany prototype pollution
A vulnerability was determined in kofrasa mingo up to 7.2.1. This impacts the function update/updateOne/updateMany of the component Update API. Executing a manipulation of the argument Set can lead to improperly controlled modification of object prototype att…
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Medium 6.3
svgdotjs svg.js npm Package API EventTarget.on prototype pollution
A vulnerability was found in svgdotjs svg.js up to 3.2.5. This affects the function EventTarget.on of the file svgdotjs/svg.js of the component npm Package API. Performing a manipulation results in improperly controlled modification of object prototype attrib…
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Medium 4.3
tanstack db Alias Path select.ts select prototype pollution
A vulnerability was detected in tanstack db up to 0.6.8. Affected by this vulnerability is the function select of the file src/query/compiler/select.ts of the component Alias Path Handler. The manipulation results in improperly controlled modification of obje…
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Medium 6.3CVE-2026-15598 Public exploit
antv layout object.js setNestedValue prototype pollution
A weakness has been identified in antv layout 2.0.0. This impacts the function setNestedValue in the library lib/util/object.js. Executing a manipulation of the argument path can lead to improperly controlled modification of object prototype attributes. The a…
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Medium 6.3
primefaces primereact API ObjectUtils.js ObjectUtils.mutateFieldData prototype pollution
A weakness has been identified in primefaces primereact up to 10.9.8. This issue affects the function ObjectUtils.mutateFieldData of the file components/lib/utils/ObjectUtils.js of the component API. This manipulation of the argument Field causes improperly c…
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Medium 4.8
Hono - Prototype Pollution via __proto__ Key in parseBody with dot Option
Hono before 4.12.7 allows __proto__ key in parseBody with dot option enabled, permitting specially crafted form field names to create objects with __proto__ properties. When parsed results are merged into regular JavaScript objects using unsafe merge patterns…
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Medium 6.3
apidevtools json-schema-ref-parser pointer.ts Pointer.set prototype pollution
A weakness has been identified in apidevtools json-schema-ref-parser. This impacts the function Refs.set/Pointer.set in the library lib/pointer.ts. Executing a manipulation can lead to improperly controlled modification of object prototype attributes. The att…
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Medium 4.3
enquirer Public Package API Enquirer.set prototype pollution
A security flaw has been discovered in enquirer up to 2.4.1. Affected is the function Enquirer.set of the component Public Package API. The manipulation of the argument question.name results in improperly controlled modification of object prototype attributes…
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Medium 4.8
protobufjs: Text Format string map parsing can mutate returned map object prototype
protobufjs compiles protobuf definitions into JavaScript (JS) functions. From 8.2.0 until 8.6.5, the protobufjs Text Format extension parsed string-keyed map entries using ordinary property assignment, allowing a map entry with key __proto__ to change the pro…
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Medium 5.0
CyberChef: Prototype pollution in Series Chart operation
CyberChef is a web app for encryption, encoding, compression, and data analysis. Prior to 11.2.0, the Series Chart operation accepts __proto__ as a key while parsing user-supplied CSV, allowing prototype pollution that can be chained with operations such as P…
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Medium 6.3
Jodit Editor: Prototype pollution via Jodit.configure() / ConfigMerge
Jodit Editor is a WYSIWYG editor with written in pure TypeScript file and image editing capabilities. In versions prior to 4.12.18, Jodit.configure(options) — and the internal ConfigMerge / ConfigProto helpers — merged user-supplied options into the editor co…
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Medium 6.3
Jodit Editor: Prototype Pollution in Jodit via Jodit.modules.Helpers.set()
Jodit Editor is a WYSIWYG editor with written in pure TypeScript file and image editing capabilities. Versions prior to 4.12.26 are vulnerable to Prototype Pollution through Jodit.modules.Helpers.set(chain, value, obj), which walks the dot-separated chain, cr…
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Medium 6.3
n8n: Prototype Pollution enables confused-deputy execution via public webhooks
n8n is an open source workflow automation platform. Prior to 2.25.7 and 2.26.2, a prototype pollution vulnerability allowed a crafted public webhook payload to inject attacker-controlled fields into workflow data during internal object copying. These fields c…
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Medium 5.3
RubyLouvre avalon Template Filter index.js prototype pollution
A security vulnerability has been detected in RubyLouvre avalon up to 2.2.10. The impacted element is an unknown function of the file src/filters/index.js of the component Template Filter Handler. Such manipulation leads to improperly controlled modification …
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Medium 5.3
jsonata-js jsonata Function Binding Frame System jsonata.js createFrame prototype pollution
A weakness has been identified in jsonata-js jsonata up to 2.2.0. The affected element is the function createFrame of the file src/jsonata.js of the component Function Binding Frame System. This manipulation causes improperly controlled modification of object…
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Medium 4.8
Axios: DoS & Header Injection via Prototype Pollution Read-Side Gadgets in axios merge functions
Axios is a promise based HTTP client for the browser and Node.js. Prior to 0.32.0 and 1.16.0, axios exposes two read-side prototype-pollution gadgets. When Object.prototype is polluted by an upstream dependency in the same process (e.g. lodash _.merge / CVE-2…
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Medium 4.3
Prototype pollution in csv parsing
Prototype pollution in csv parsing logic during import can lead to untrusted file paths (but not arguments) entering shell.openExternal after specific user behavior leading to "1-click" command execution.
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Medium 5.3
protobufjs: Prototype injection in generated message constructors
protobufjs compiles protobuf definitions into JavaScript (JS) functions. Prior to 7.5.6 and 8.0.2, protobufjs generated message constructors copied enumerable properties from a provided properties object without filtering the __proto__ key. If an application …
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Medium 4.2
next-intl has prototype pollution with `experimental.messages.precompile` via attacker-controlled translation catalog keys
## Summary `setNestedProperty` in `packages/next-intl/src/extractor/utils.tsx` walks a dotted key path and assigns the final value without blocking the reserved keys `__proto__`, `constructor`, or `prototype`. When the next-intl Next.js plugin is configured w…
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Medium 5.2
Evolver: Prototype Pollution via `Object.assign()` in mailbox store operations
Evolver is a GEP-powered self-evolving engine for AI agents. Prior to version 1.69.3, a prototype pollution vulnerability in the mailbox store module allows attackers to modify the behavior of all JavaScript objects by injecting malicious properties into Obje…