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Ractive.js EUVDEUVD-2026-64704

| CVE-2026-78181 MEDIUM
Improperly Controlled Modification of Object Prototype Attributes (Prototype Pollution) (CWE-1321)
2026-08-24 VulDB GHSA-66g2-xvjx-x9j9
Information Disclosure Prototype Pollution Ractive
5.5
CVSS 4.0 · Vendor: VulDB
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Severity by source

Vendor (VulDB) PRIMARY
5.5 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:P/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 vector with no privileges required as library accepts untrusted keypaths; unchanged scope since pollution is contained to the application runtime; low C/I/A reflecting property injection without direct RCE.

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:P/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

3
Analysis Generated
Aug 24, 2026 - 04:37 vuln.today
CVSS changed
Aug 24, 2026 - 04:22 NVD
6.9 (MEDIUM) 5.5 (MEDIUM)
CVE Published
Aug 24, 2026 - 03:30 cve.org
MEDIUM 5.5

DescriptionCVE.org

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.

AnalysisAI

Prototype pollution in ractivejs/ractive through version 1.4.4 allows remote attackers to modify JavaScript Object.prototype attributes via the Ractive#set function's Keypath Handler component. A publicly available proof-of-concept exists (GitHub issue #3448), and the maintainers have not yet responded to the coordinated disclosure. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Send HTTP request with crafted keypath payload
Delivery
Application passes unsanitized input to Ractive#set
Exploit
Keypath Handler processes '__proto__' segment without validation
Execution
Object.prototype poisoned with attacker-controlled property
Persist
Application logic consuming plain objects inherits injected property
Impact
Authentication bypass or behavior manipulation achieved
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Vulnerability AssessmentAI

Exploitation Exploitation requires that the target application passes attacker-controlled data as the keypath argument to Ractive#set (e.g., data received from HTTP request parameters, form inputs, or API payloads is used directly as a keypath string). … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 4.0 base vector (AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L) indicates network-accessible, low-complexity exploitation requiring no privileges and no user interaction, with low impact across confidentiality, integrity, and availability - yielding a score of 5.5. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker identifies a web application that uses Ractive.js 1.4.x and passes user-supplied form or query parameter data to a Ractive#set call. By submitting a crafted keypath value such as '__proto__.isAdmin' set to true, the attacker poisons Object.prototype, causing all subsequently created plain objects in the application to inherit the injected property. …
Remediation No vendor-released patch is available at time of analysis - the project has not responded to the disclosure filed via GitHub issue #3448 (https://github.com/ractivejs/ractive/issues/3448). … 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-2026-64704 vulnerability details – vuln.today
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