Common Weakness Enumeration
CWE-1321
AllowedImproperly 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.
849 vulnerabilities reference this CWE, most recent first.
CVE-2026-78207 (GCVE-0-2026-78207)
Vulnerability from cvelistv5 – Published: 2026-08-24 00:30 – Updated: 2026-08-24 17:46
VLAI
EPSS
VEX
Title
exceljs through 4.4.0 Prototype Pollution via deepMerge Reached From Note Serialization
Summary
exceljs-hardened before 5.0.0 contains a prototype pollution vulnerability in the deepMerge helper that fails to reject __proto__, constructor, or prototype keys when merging note objects. Attackers can assign parsed JSON with a malicious __proto__ property to cell notes, modifying Object.prototype and affecting all plain objects created in the process.
Severity
9.4 (Critical)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-24 17:45 UTC
CWE
- CWE-1321 - Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://github.com/exceljs/exceljs | product |
| https://github.com/mateocallec/exceljs-hardened/s… | third-party-advisory |
| https://github.com/exceljs/exceljs/blob/v4.4.0/li… | technical-description |
| https://www.vulncheck.com/advisories/exceljs-thro… | third-party-advisory |
Impacted products
Date Public
2026-08-23 00:00
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CVE-2026-78181 (GCVE-0-2026-78181)
Vulnerability from cvelistv5 – Published: 2026-08-24 03:30 – Updated: 2026-08-24 03:30
VLAI
EPSS
VEX
Title
ractivejs ractive Keypath Ractive#set prototype pollution
Summary
A weakness has been identified in ractivejs ractive up to 1.4.4. Impacted is the function Ractive#set of the component Keypath Handler. Executing a manipulation can lead to improperly controlled modification of object prototype attributes. The attack may be launched remotely. The exploit has been made available to the public and could be used for attacks. The project was informed of the problem early through an issue report but has not responded yet.
Severity
CWE
Assigner
References
6 references
| URL | Tags |
|---|---|
| https://vuldb.com/vuln/394565 | vdb-entrytechnical-description |
| https://vuldb.com/vuln/394565/cti | signaturepermissions-required |
| https://vuldb.com/cve/CVE-2026-78181 | third-party-advisory |
| https://vuldb.com/submit/884187 | third-party-advisory |
| https://github.com/ractivejs/ractive/issues/3448 | exploitissue-tracking |
| https://github.com/ractivejs/ractive/ | product |
Impacted products
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CVE-2026-78180 (GCVE-0-2026-78180)
Vulnerability from cvelistv5 – Published: 2026-08-24 03:15 – Updated: 2026-08-24 17:12
VLAI
EPSS
VEX
Title
alibaba-fusion next deepMerge index.tsx ConfigProvider.getContextProps prototype pollution
Summary
A security flaw has been discovered in alibaba-fusion next up to 1.27.34. This issue affects the function ConfigProvider.getContextProps of the file components/dialog/index.tsx of the component deepMerge. Performing a manipulation of the argument locale results in improperly controlled modification of object prototype attributes. The attack may be initiated remotely. The reported GitHub issue was closed automatically due to inactivity.
Severity
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-24 17:06 UTC
CWE
Assigner
References
6 references
| URL | Tags |
|---|---|
| https://vuldb.com/vuln/394564 | vdb-entrytechnical-description |
| https://vuldb.com/vuln/394564/cti | signaturepermissions-required |
| https://vuldb.com/cve/CVE-2026-78180 | third-party-advisory |
| https://vuldb.com/submit/884184 | third-party-advisory |
| https://github.com/alibaba-fusion/next/issues/5101 | issue-tracking |
| https://github.com/alibaba-fusion/next/ | product |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| alibaba-fusion | next |
Affected:
1.27.0
Affected: 1.27.1 Affected: 1.27.2 Affected: 1.27.3 Affected: 1.27.4 Affected: 1.27.5 Affected: 1.27.6 Affected: 1.27.7 Affected: 1.27.8 Affected: 1.27.9 Affected: 1.27.10 Affected: 1.27.11 Affected: 1.27.12 Affected: 1.27.13 Affected: 1.27.14 Affected: 1.27.15 Affected: 1.27.16 Affected: 1.27.17 Affected: 1.27.18 Affected: 1.27.19 Affected: 1.27.20 Affected: 1.27.21 Affected: 1.27.22 Affected: 1.27.23 Affected: 1.27.24 Affected: 1.27.25 Affected: 1.27.26 Affected: 1.27.27 Affected: 1.27.28 Affected: 1.27.29 Affected: 1.27.30 Affected: 1.27.31 Affected: 1.27.32 Affected: 1.27.33 Affected: 1.27.34 cpe:2.3:a:next:next:*:*:*:*:*:*:*:* |
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CVE-2026-78179 (GCVE-0-2026-78179)
Vulnerability from cvelistv5 – Published: 2026-08-24 03:00 – Updated: 2026-08-24 14:07
VLAI
EPSS
VEX
Title
rexrainbow phaser3-rex-notes BehaviorTree Blackboard Data SetValue.js SetValue prototype pollution
Summary
A vulnerability was identified in rexrainbow phaser3-rex-notes up to 1.80.17. This vulnerability affects the function SetValue of the file plugins/utils/object/SetValue.js of the component BehaviorTree Blackboard Data Interface. Such manipulation of the argument key leads to improperly controlled modification of object prototype attributes. The attack can be launched remotely.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-24 14:07 UTC
CWE
Assigner
References
6 references
| URL | Tags |
|---|---|
| https://vuldb.com/vuln/394563 | vdb-entrytechnical-description |
| https://vuldb.com/vuln/394563/cti | signaturepermissions-required |
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| https://vuldb.com/submit/884183 | third-party-advisory |
| https://github.com/rexrainbow/phaser3-rex-notes/i… | issue-tracking |
| https://github.com/rexrainbow/phaser3-rex-notes/ | product |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| rexrainbow | phaser3-rex-notes |
Affected:
1.80.0
Affected: 1.80.1 Affected: 1.80.2 Affected: 1.80.3 Affected: 1.80.4 Affected: 1.80.5 Affected: 1.80.6 Affected: 1.80.7 Affected: 1.80.8 Affected: 1.80.9 Affected: 1.80.10 Affected: 1.80.11 Affected: 1.80.12 Affected: 1.80.13 Affected: 1.80.14 Affected: 1.80.15 Affected: 1.80.16 Affected: 1.80.17 cpe:2.3:a:rexrainbow:phaser3-rex-notes:*:*:*:*:*:*:*:* |
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CVE-2026-78178 (GCVE-0-2026-78178)
Vulnerability from cvelistv5 – Published: 2026-08-24 02:45 – Updated: 2026-08-24 02:45
VLAI
EPSS
VEX
Title
jQWidgets jqx-all.js jqxBaseFramework.extend prototype pollution
Summary
A vulnerability was determined in jQWidgets up to 24.0.1. This affects the function JQXLite.extend/jqxBaseFramework.extend of the file jqwidgets/jqx-all.js. This manipulation causes improperly controlled modification of object prototype attributes. The attack can be initiated remotely. The reported GitHub issue was closed with the label "not planned".
Severity
CWE
Assigner
References
6 references
| URL | Tags |
|---|---|
| https://vuldb.com/vuln/394562 | vdb-entrytechnical-description |
| https://vuldb.com/vuln/394562/cti | signaturepermissions-required |
| https://vuldb.com/cve/CVE-2026-78178 | third-party-advisory |
| https://vuldb.com/submit/884182 | third-party-advisory |
| https://github.com/jqwidgets/jQWidgets/issues/764 | issue-tracking |
| https://github.com/jqwidgets/jQWidgets/ | product |
Impacted products
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CVE-2026-77083 (GCVE-0-2026-77083)
Vulnerability from cvelistv5 – Published: 2026-08-20 11:21 – Updated: 2026-08-21 11:21
VLAI
EPSS
VEX
Title
n8n before 1.123.69 Code Node Sandbox Escape via Function.prototype Pollution
Summary
n8n is a workflow automation platform. In versions prior to 1.123.69, 2.33.4, and 2.34.1, the JavaScript Code node's VM sandbox did not freeze the sandbox's Function.prototype, allowing an authenticated user with the ability to create and execute workflows to pollute it from within a Code node execution and recover a reference to the host's globalThis, resulting in a sandbox escape. The full exploit chain additionally depends on specific modules being available as allowlisted imports in the deployment's configuration. The issue is fixed in versions 1.123.69, 2.33.4, and 2.34.1.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-20 14:53 UTC
CWE
- CWE-1321 - Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/n8n-io/n8n/security/advisories… | vendor-advisory |
| https://www.vulncheck.com/advisories/n8n-before-c… | third-party-advisory |
Impacted products
Date Public
2026-08-05 00:00
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CVE-2026-73654 (GCVE-0-2026-73654)
Vulnerability from cvelistv5 – Published: 2026-08-13 19:29 – Updated: 2026-08-14 16:34
VLAI
EPSS
VEX
Title
Trigger.dev: Prototype pollution via run metadata operations → process-wide cross-tenant DoS
Summary
Trigger.dev is a platform for building and deploying fully managed AI agents and workflows. From 3.3.8 until 4.5.6, the PUT /api/v1/runs/:runId/metadata endpoint passes attacker-controlled operation.key values to new JSONHeroPath(operation.key).set(newMetadata, value) in packages/core/src/v3/runMetadata/operations.ts without rejecting dangerous constructor and prototype path segments. A caller with a normal environment API key can pollute Object.prototype in the shared webapp process, corrupting Prisma queries and Prometheus labels, breaking other tenants' worker authentication, and causing a process-wide denial of service. This issue is fixed in version 4.5.6.
Severity
8.5 (High)
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-14 16:33 UTC
CWE
- CWE-1321 - Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://github.com/triggerdotdev/trigger.dev/secu… | x_refsource_CONFIRM |
| https://github.com/triggerdotdev/trigger.dev/pull/4316 | x_refsource_MISC |
| https://github.com/triggerdotdev/trigger.dev/comm… | x_refsource_MISC |
| https://github.com/triggerdotdev/trigger.dev/rele… | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| triggerdotdev | trigger.dev |
Affected:
>= 3.3.8, < 4.5.6
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CVE-2026-73647 (GCVE-0-2026-73647)
Vulnerability from cvelistv5 – Published: 2026-08-13 17:57 – Updated: 2026-08-13 18:41
VLAI
EPSS
VEX
Title
Quasar Framework: Prototype pollution in Quasar extend() utility
Summary
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 merges without rejecting an own __proto__ property. The merge could descend into the prototype object and write attacker-controlled properties to Object.prototype in the same JavaScript process. Applications that passed user-controlled or partially user-controlled objects to extend() could experience logic bypass, unsafe default-option injection, denial of service, or other application-specific impact when polluted properties were later consumed. This issue is fixed in version 2.22.0.
Severity
5.6 (Medium)
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-13 18:41 UTC
CWE
- CWE-1321 - Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://github.com/quasarframework/quasar/securit… | x_refsource_CONFIRM |
| https://github.com/quasarframework/quasar/commit/… | x_refsource_MISC |
| https://github.com/quasarframework/quasar/release… | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| quasarframework | quasar |
Affected:
< 2.22.0
|
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CVE-2026-73562 (GCVE-0-2026-73562)
Vulnerability from cvelistv5 – Published: 2026-08-13 17:27 – Updated: 2026-08-14 18:09
VLAI
EPSS
VEX
Title
Mongoose: Prototype pollution in the update casting via __proto__-prefixed dotted path (Schema._getSchema/path getter)
Summary
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 __proto__.x dotted path under $set. Schema.prototype.path and Schema.prototype._getPathType can treat inherited properties of schema.paths and schema.nested as schema types, allowing the casting process to set $fullPath and $parentSchemaDocArray on Object.prototype before throwing. This prototype pollution makes those properties visible on newly created objects and can cause application integrity and availability impacts. This issue is fixed in versions 6.13.10, 7.8.10, 8.24.1, and 9.7.2.
Severity
6.5 (Medium)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-14 17:41 UTC
CWE
- CWE-1321 - Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')
Assigner
References
5 references
| URL | Tags |
|---|---|
| https://github.com/Automattic/mongoose/security/a… | x_refsource_CONFIRM |
| https://github.com/Automattic/mongoose/commit/35a… | x_refsource_MISC |
| https://github.com/Automattic/mongoose/commit/728… | x_refsource_MISC |
| https://github.com/Automattic/mongoose/commit/953… | x_refsource_MISC |
| https://github.com/Automattic/mongoose/commit/fab… | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Automattic | mongoose |
Affected:
< 6.13.10
Affected: >= 7.0.0, < 7.8.10 Affected: >= 8.0.0, < 8.24.1 Affected: >= 9.0.0, < 9.7.2 |
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CVE-2026-73088 (GCVE-0-2026-73088)
Vulnerability from cvelistv5 – Published: 2026-08-11 17:00 – Updated: 2026-08-13 14:50
VLAI
EPSS
VEX
Title
Browserslist: Uncaught crash / prototype write via untrusted browserslist-stats.json custom stats (normalizeStats)
Summary
Browserslist is a configuration tool for sharing target browsers and Node.js versions between front-end tools. Prior to 4.28.7, normalizeStats() in node.js, reached unconditionally through getStat() and loadStat() on every browserslist() call, processes untrusted browserslist-stats.json, opts.stats, and CLI --stats data with an unguarded for...in loop and plain-object bracket access and assignment, allowing inherited Object.prototype keys including __proto__, toString, valueOf, constructor, hasOwnProperty, and isPrototypeOf to cause an uncaught TypeError or modify the prototype of the returned normalized object. This issue is fixed in version 4.28.7.
Severity
7.5 (High)
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-13 14:50 UTC
CWE
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://github.com/browserslist/browserslist/secu… | x_refsource_CONFIRM |
| https://github.com/browserslist/browserslist/comm… | x_refsource_MISC |
| https://github.com/browserslist/browserslist/rele… | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| browserslist | browserslist |
Affected:
< 4.28.7
|
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"metrics": [
{
"cvssV3_1": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 7.5,
"baseSeverity": "HIGH",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"version": "3.1"
}
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-1321",
"description": "CWE-1321: Improperly Controlled Modification of Object Prototype Attributes (\u0027Prototype Pollution\u0027)",
"lang": "en",
"type": "CWE"
}
]
},
{
"descriptions": [
{
"cweId": "CWE-248",
"description": "CWE-248: Uncaught Exception",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-08-11T17:00:05.869Z",
"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"shortName": "GitHub_M"
},
"references": [
{
"name": "https://github.com/browserslist/browserslist/security/advisories/GHSA-73wf-gq98-2v4g",
"tags": [
"x_refsource_CONFIRM"
],
"url": "https://github.com/browserslist/browserslist/security/advisories/GHSA-73wf-gq98-2v4g"
},
{
"name": "https://github.com/browserslist/browserslist/commit/f9914ad9effc865ccc27d816255625890b31ca51",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/browserslist/browserslist/commit/f9914ad9effc865ccc27d816255625890b31ca51"
},
{
"name": "https://github.com/browserslist/browserslist/releases/tag/4.28.7",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/browserslist/browserslist/releases/tag/4.28.7"
}
],
"source": {
"advisory": "GHSA-73wf-gq98-2v4g",
"discovery": "UNKNOWN"
},
"title": "Browserslist: Uncaught crash / prototype write via untrusted browserslist-stats.json custom stats (normalizeStats)"
}
},
"cveMetadata": {
"assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"assignerShortName": "GitHub_M",
"cveId": "CVE-2026-73088",
"datePublished": "2026-08-11T17:00:05.869Z",
"dateReserved": "2026-08-10T19:37:41.445Z",
"dateUpdated": "2026-08-13T14:50:43.387Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
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.