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alibaba-fusion Next CVE-2026-78180

| EUVDEUVD-2026-64702 MEDIUM
Improperly Controlled Modification of Object Prototype Attributes (Prototype Pollution) (CWE-1321)
2026-08-24 VulDB GHSA-8mfc-fm4w-pgff
Information Disclosure Prototype Pollution Next
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
8.3 HIGH

Network-delivered prototype pollution with no auth or interaction; scope changed because Object.prototype pollution affects the entire shared JavaScript runtime beyond the vulnerable component.

3.1 AV:N/AC:L/PR:N/UI:N/S:C/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 - 03:46 vuln.today

DescriptionCVE.org

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.

AnalysisAI

Prototype pollution in alibaba-fusion/next (all versions through 1.27.34) allows remote unauthenticated attackers to inject arbitrary properties into Object.prototype by supplying crafted values to the locale argument processed by the deepMerge function inside ConfigProvider.getContextProps within the Dialog component. The attack is network-reachable with no authentication or user interaction required per the CVSS 4.0 vector, though real-world exploitation depends on attacker-controlled data reaching the locale prop. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Recon
Identify web app using alibaba-fusion/next Dialog
Delivery
Craft locale payload with __proto__ key
Exploit
Deliver payload to endpoint populating locale prop
Install
deepMerge traverses __proto__ without sanitization
C2
Object.prototype polluted with attacker properties
Execute
Downstream security check reads polluted property
Impact
Privilege or logic bypass achieved
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Vulnerability AssessmentAI

Exploitation Exploitation requires that the target application uses alibaba-fusion/next at version 1.27.34 or earlier with the Dialog component rendered and ConfigProvider.getContextProps called, and that attacker-controlled data flows into the locale argument processed by deepMerge. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 4.0 vector (AV:N/AC:L/AT:N/PR:N/UI:N) characterizes this as remotely exploitable with no prerequisites, which is the maximum-exposure attack surface profile. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker who can influence the locale prop value passed to a Dialog or ConfigProvider component - for example, via a URL parameter, API response, or user-supplied settings - submits a crafted object such as {"__proto__": {"isAdmin": true}} as the locale value. The unguarded deepMerge function traverses __proto__ and sets the injected property on Object.prototype, causing every subsequently created object in the application to inherit isAdmin: true. …
Remediation No vendor-released patch has been identified at time of analysis; the GitHub issue at https://github.com/alibaba-fusion/next/issues/5101 was closed automatically due to inactivity without a fix being merged or acknowledged. … Detailed patch versions, workarounds, and compensating controls in full report.
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Same technique Information Disclosure

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CVE-2026-78180 vulnerability details – vuln.today
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