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jQWidgets CVE-2026-78178

| EUVDEUVD-2026-64700 MEDIUM
Improperly Controlled Modification of Object Prototype Attributes (Prototype Pollution) (CWE-1321)
2026-08-24 VulDB GHSA-hhpq-pm9g-crh9
Information Disclosure Prototype Pollution Jqwidgets
6.9
CVSS 4.0 · Vendor: VulDB
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Severity by source

Vendor (VulDB) PRIMARY
6.9 MEDIUM
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
vuln.today AI
7.3 HIGH

Network-reachable via crafted input, no auth required per PR:N, scope unchanged as impact is confined to the vulnerable application's JS runtime with limited C/I/A.

3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
4.0 AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N

Primary rating from Vendor (VulDB).

CVSS VectorVendor: VulDB

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
X

Lifecycle Timeline

1
Analysis Generated
Aug 24, 2026 - 03:31 vuln.today

DescriptionCVE.org

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".

AnalysisAI

Prototype pollution in jQWidgets up to version 24.0.1 allows remote unauthenticated attackers to manipulate JavaScript object prototypes via the JQXLite.extend and jqxBaseFramework.extend functions in jqwidgets/jqx-all.js. Successful exploitation can affect the confidentiality, integrity, and availability of any web application embedding this library. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Identify jQWidgets-powered application endpoint
Delivery
Craft JSON payload with __proto__ or constructor key
Exploit
Submit payload via HTTP request
Execution
extend() merges payload into Object.prototype
Persist
Polluted property inherited by all application objects
Impact
Trigger prototype-dependent logic for disclosure or integrity impact
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Vulnerability AssessmentAI

Exploitation Exploitation requires that the application passes attacker-controlled input - such as URL query parameters, form fields, API request bodies, or parsed JSON - into the `JQXLite.extend` or `jqxBaseFramework.extend` function without sanitizing keys like `__proto__`, `constructor`, or `prototype`. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 4.0 score of 6.9 with AV:N/AC:L/AT:N/PR:N/UI:N reflects that exploitation requires no authentication, no interaction, and no unusual conditions - consistent with how prototype pollution primitives are typically triggered via crafted JSON or URL parameters reaching an unguarded extend function. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker submits a crafted HTTP request to a jQWidgets-powered web application carrying a JSON payload containing `{"__proto__": {"isAdmin": true}}` in a field that the application forwards to `jqxBaseFramework.extend`. The extend function merges the payload without key filtering, injecting `isAdmin: true` onto `Object.prototype`, which all subsequent objects in the application inherit - potentially bypassing access control checks that test `object.isAdmin`. …
Remediation No vendor-released patch is available and none is expected - the GitHub issue at https://github.com/jqwidgets/jQWidgets/issues/764 was closed by the maintainer as 'not planned.' The primary long-term remediation is migrating to an actively maintained UI widget library. … Detailed patch versions, workarounds, and compensating controls in full report.
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Same weakness CWE-1321 – Improperly Controlled Modification of Object Prototype Attributes (Prototype Pollution)

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Same technique Information Disclosure

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CVE-2015-1701 HIGH POC
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CVE-2017-0147 HIGH POC
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CVE-2014-6324 HIGH POC
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CVE-2026-78178 vulnerability details – vuln.today
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