How to fix CVE-2025-42620?

Within 24 hours: Identify all Vulnerability-Lookup instances and confirm current versions. Within 7 days: Upgrade all instances to version 2.18.0 or later per vendor guidance. Within 30 days: Audit bundle and comment history for suspicious content; consider clearing or reviewing comments/bundles created by untrusted accounts prior to patching; implement content security policy (CSP) headers if not already in place.

CVE-2025-42620

EUVD-2025-201710 HIGH

2025-12-08 a6d3dc9e-0591-4a13-bce7-0f5b31ff6158

XSS

8.3

CVSS 4.0

CVSS VectorNVD

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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

High

User Interaction

Lifecycle Timeline

Analysis Updated

Apr 16, 2026 - 06:23 EUVD-patch-fix

executive_summary

Re-analysis Queued

Apr 16, 2026 - 05:29 backfill_euvd_patch

patch_released

patch_available

Apr 16, 2026 - 05:29 EUVD

2.18.0

Analysis Generated

Mar 15, 2026 - 17:54 vuln.today

EUVD ID Assigned

Mar 15, 2026 - 17:54 euvd

EUVD-2025-201710

CVE Published

Dec 08, 2025 - 13:15 nvd

HIGH 8.3

DescriptionNVD

In affected versions, vulnerability-lookup handled user-controlled content in comments and bundles in an unsafe way, which could lead to stored Cross-Site Scripting (XSS).

On the backend, the related_vulnerabilities field of bundles accepted arbitrary strings without format validation or proper sanitization. On the frontend, comment and bundle descriptions were converted from Markdown to HTML and then injected directly into the DOM using string templates and innerHTML. This combination allowed an attacker who could create or edit comments or bundles to store crafted HTML/JavaScript payloads which would later be rendered and executed in the browser of any user visiting the affected profile page (user.html).

This issue affects Vulnerability-Lookup: before 2.18.0.

AnalysisAI

In affected versions, vulnerability-lookup handled user-controlled content in comments and bundles in an unsafe way, which could lead to stored Cross-Site Scripting (XSS).

This issue affects Vulnerability-Lookup: before 2.18.0.

Technical ContextAI

Cross-site scripting (XSS) allows injection of client-side scripts into web pages viewed by other users due to insufficient output encoding.

RemediationAI

Encode all user-supplied output contextually (HTML, JS, URL). Implement Content Security Policy (CSP) headers. Use HTTPOnly and Secure cookie flags.

CVE-2025-42620 vulnerability details – vuln.today

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