Linkifyjs: Linkify Allows Prototype Pollution & HTML Attribute Injection (XSS) (CVE-2025-8101)
Linkify version 4.3.1 contains a prototype pollution vulnerability in its internal assign() helper function. This flaw allows remote attackers to inject event handlers via the unfiltered __proto__ property, leading to arbitrary JavaScript execution through stored or reflected cross-site scripting (XSS). The issue is resolved in version 4.3.2.
AI Analysis
Technical Summary
The vulnerability in Linkify 4.3.1 arises from prototype pollution in the internal assign() helper, which fails to properly filter the __proto__ property. This enables attackers to inject malicious event handlers that can execute arbitrary JavaScript code, resulting in stored or reflected XSS attacks. The vulnerability is tracked as CVE-2025-8101 and is fixed in Linkify version 4.3.2.
Potential Impact
Successful exploitation allows remote attackers to execute arbitrary JavaScript in the context of the affected application, potentially leading to cross-site scripting (XSS) attacks. This can compromise user data, session tokens, or perform actions on behalf of the user. The vulnerability affects Linkify 4.3.1 and similar versions prior to 4.3.2.
Mitigation Recommendations
Upgrade Linkify to version 4.3.2 or later, where the prototype pollution vulnerability has been fixed. No other mitigations are indicated by the vendor advisory.
Linkifyjs: Linkify Allows Prototype Pollution & HTML Attribute Injection (XSS) (CVE-2025-8101)
Description
Linkify version 4.3.1 contains a prototype pollution vulnerability in its internal assign() helper function. This flaw allows remote attackers to inject event handlers via the unfiltered __proto__ property, leading to arbitrary JavaScript execution through stored or reflected cross-site scripting (XSS). The issue is resolved in version 4.3.2.
CVSS v4.0
Affected software
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Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The vulnerability in Linkify 4.3.1 arises from prototype pollution in the internal assign() helper, which fails to properly filter the __proto__ property. This enables attackers to inject malicious event handlers that can execute arbitrary JavaScript code, resulting in stored or reflected XSS attacks. The vulnerability is tracked as CVE-2025-8101 and is fixed in Linkify version 4.3.2.
Potential Impact
Successful exploitation allows remote attackers to execute arbitrary JavaScript in the context of the affected application, potentially leading to cross-site scripting (XSS) attacks. This can compromise user data, session tokens, or perform actions on behalf of the user. The vulnerability affects Linkify 4.3.1 and similar versions prior to 4.3.2.
Mitigation Recommendations
Upgrade Linkify to version 4.3.2 or later, where the prototype pollution vulnerability has been fixed. No other mitigations are indicated by the vendor advisory.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- GHSA-95jq-xph2-cx9h
- Osv Schema Version
- 1.4.0
- Aliases
- ["CVE-2025-8101"]
- Ecosystems
- ["npm"]
- Database Specific Severity
- HIGH
- Cvss Version
- 4.0
Threat ID: 6a3ef76c27e9c79719fee89b
Added to database: 06/26/2026, 22:04:28 UTC
Last enriched: 06/26/2026, 22:09:05 UTC
Last updated: 09/10/2026, 19:36:52 UTC
Views: 44
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