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phaser3-rex-notes EUVDEUVD-2026-64701

| CVE-2026-78179 MEDIUM
Improperly Controlled Modification of Object Prototype Attributes (Prototype Pollution) (CWE-1321)
2026-08-24 VulDB GHSA-p3p3-2chg-5xhx
Information Disclosure Prototype Pollution Phaser3 Rex Notes
5.3
CVSS 4.0 · Vendor: VulDB
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Severity by source

Vendor (VulDB) PRIMARY
5.3 MEDIUM
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/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
6.3 MEDIUM

Network-accessible prototype pollution requiring low privileges; unchanged scope with limited CIA impact consistent with CVSS 4.0 VC:L/VI:L/VA:L and SC/SI/SA:N.

3.1 AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L
4.0 AV:N/AC:L/AT:N/PR:L/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:L/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
Low
User Interaction
None
Scope
X

Lifecycle Timeline

1
Analysis Generated
Aug 24, 2026 - 03:45 vuln.today

DescriptionCVE.org

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.

AnalysisAI

Prototype pollution in rexrainbow/phaser3-rex-notes up to version 1.80.17 allows remote authenticated attackers with low privileges to manipulate JavaScript object prototype attributes via a crafted key argument to the SetValue function in the BehaviorTree Blackboard Data Interface. Exploitation can result in low-level confidentiality disclosure, integrity modification, and availability disruption, consistent with classic prototype pollution impact on downstream object behavior. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Authenticate with low-privilege access
Delivery
Submit crafted __proto__ key to BehaviorTree Blackboard
Exploit
SetValue assigns property without sanitization
Execution
Object.prototype polluted in runtime
Persist
Downstream logic reads attacker-controlled property values
Impact
Confidentiality or integrity impact achieved
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Vulnerability AssessmentAI

Exploitation Exploitation requires the attacker to hold low-level privileges (PR:L per the CVSS 4.0 vector) sufficient to interact with the BehaviorTree Blackboard Data Interface's SetValue function and supply an arbitrary key argument. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The provided CVSS 4.0 vector (AV:N/AC:L/AT:N/PR:L/UI:N with VC:L/VI:L/VA:L and no subsequent-system impact) scores 5.3 (Medium), indicating a moderate real-world priority. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario A low-privileged user or network-accessible client interacting with a game server or application that exposes the BehaviorTree Blackboard Data Interface submits a crafted payload with a key value such as __proto__.isAdmin set to true, targeting the SetValue function. The unpatched function assigns this property without validation, polluting Object.prototype and causing all subsequent object property lookups for isAdmin across the runtime to return true. …
Remediation No vendor-released patched version has been independently confirmed at time of analysis - the available references point to a GitHub issue (https://github.com/rexrainbow/phaser3-rex-notes/issues/572) and VulDB entries rather than a tagged release with a fix. … 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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EUVD-2026-64701 vulnerability details – vuln.today
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