Vulnerability-Lookup

CVE-2025-8101 (GCVE-0-2025-8101)

Vulnerability from cvelistv5 – Published: 2025-07-25 21:52 – Updated: 2025-12-03 21:04

Title

Linkify 4.3.1 - Prototype Pollution & HTML Attribute Injection (XSS)

Summary

Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution') vulnerability in Linkify (linkifyjs) allows XSS Targeting HTML Attributes and Manipulating User-Controlled Variables.This issue affects Linkify: from 4.3.1 before 4.3.2.

Severity

8.8 (High)


                        
                          CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:H/VA:L/SC:N/SI:N/SA:N

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2025-07-28 14:56 UTC

CWE

CWE-1321 - Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')

Assigner

Fluid Attacks

References

4 references

URL	Tags
https://fluidattacks.com/advisories/charly	third-party-advisory
https://github.com/nfrasser/linkifyjs	product
https://www.npmjs.com/package/linkifyjs	product
https://github.com/nfrasser/linkifyjs/releases/ta…	patch

Impacted products

1 product

Vendor	Product	Version	CPE status
Linkify	Linkify	Affected: 4.3.1 , < 4.3.2 (custom) cpe:2.3:a:linkify:linkify::::::::

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2025-8101

Vulnerability from fkie_nvd - Published: 2025-07-25 22:15 - Updated: 2026-06-17 10:06

Severity

8.8 (High) - CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:H/VA:L/SC:N/SI:N/SA:N

Summary

References

	URL	Tags
	help@fluidattacks.com	https://fluidattacks.com/advisories/charly
	help@fluidattacks.com	https://github.com/nfrasser/linkifyjs
	help@fluidattacks.com	https://github.com/nfrasser/linkifyjs/releases/tag/v4.3.2
	help@fluidattacks.com	https://www.npmjs.com/package/linkifyjs

Impacted products

	Vendor	Product	Version

JSON

To clipboard

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          "collectionURL": "https://registry.npmjs.org",
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  ],
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GHSA-95JQ-XPH2-CX9H

Vulnerability from github – Published: 2025-07-26 00:30 – Updated: 2026-06-26 20:26

Summary

Linkify Allows Prototype Pollution & HTML Attribute Injection (XSS)

Details

Prototype Pollution in internal assign() helper in Linkify allows remote attackers to execute arbitrary JavaScript (Stored or Reflected XSS) via injection of event handlers through unfiltered proto property. This issue affects Linkify version 4.3.1 and is fixed in 4.3.2.

Severity

8.8 (High)


                  
                    CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:H/VA:L/SC:N/SI:N/SA:N

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{
  "affected": [
    {
      "package": {
        "ecosystem": "npm",
        "name": "linkifyjs"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "4.3.1"
            },
            {
              "fixed": "4.3.2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "4.3.1"
      ]
    }
  ],
  "aliases": [
    "CVE-2025-8101"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-1321"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2025-07-29T19:09:33Z",
    "nvd_published_at": "2025-07-25T22:15:25Z",
    "severity": "HIGH"
  },
  "details": "Prototype Pollution in internal `assign()` helper in Linkify allows remote attackers to execute arbitrary JavaScript (Stored or Reflected XSS) via injection of event handlers through unfiltered proto property. This issue affects Linkify version 4.3.1 and is fixed in 4.3.2.",
  "id": "GHSA-95jq-xph2-cx9h",
  "modified": "2026-06-26T20:26:11Z",
  "published": "2025-07-26T00:30:32Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-8101"
    },
    {
      "type": "WEB",
      "url": "https://github.com/nfrasser/linkifyjs/commit/931d3e28b68951b8f898ea4d6504696346b485b0"
    },
    {
      "type": "WEB",
      "url": "https://caverav.cl/posts/linkify-xss/linkify-xss"
    },
    {
      "type": "WEB",
      "url": "https://fluidattacks.com/advisories/charly"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/nfrasser/linkifyjs"
    },
    {
      "type": "WEB",
      "url": "https://github.com/nfrasser/linkifyjs/releases/tag/v4.3.2"
    },
    {
      "type": "WEB",
      "url": "https://www.npmjs.com/package/linkifyjs"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:H/VA:L/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Linkify Allows Prototype Pollution \u0026 HTML Attribute Injection (XSS)"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

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Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

Action not permitted

CVE-2025-8101 (GCVE-0-2025-8101)

FKIE_CVE-2025-8101

GHSA-95JQ-XPH2-CX9H

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Related by attack behaviour