CVE-2026-63671Public exploitNetwork attack vectorHinoki check available

Cross-site scripting via incomplete URL sanitization

Published Sep 16, 2026 · Updated Sep 18, 2026

Cross-site scripting in Nuxt MDC before 0.22.1 allows remote attackers to execute script through rendered untrusted Markdown. The parse-time sanitizer checks only href or src and compares data:text/html denylist entries with the shorter data: protocol, leaving SVG xlink:href JavaScript and iframe data URLs intact. Default parsing enables raw HTML; the SVG path requires a victim click and runs in the page origin, while the iframe path executes on load in an opaque origin.

CVSS severity8.1
High
EPSS probability0.47%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Cross-site scripting in Nuxt MDC before 0.22.1 allows remote attackers to execute script through rendered untrusted Markdown. The parse-time sanitizer checks only href or src and compares data:text/html denylist entries with the shorter data: protocol, leaving SVG xlink:href JavaScript and iframe data URLs intact. Default parsing enables raw HTML; the SVG path requires a victim click and runs in the page origin, while the iframe path executes on load in an opaque origin.

The record

CVE
CVE-2026-63671
Published
Sep 16, 2026
Updated
Sep 18, 2026
Vendor
Nuxt Modules
Product
Nuxt MDC
Classifications
CWE-184, CWE-79, T1059.007
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 16, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 18, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 0.22.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Nuxt Modules · Nuxt MDCversion=< 0.22.1

Published CVSS scores

8.1GitHubCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Activity data is delayed. The latest report is Sep 28, 2026.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-184Incomplete List of Disallowed Inputs
CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1059.007Command and Scripting Interpreter: JavaScript

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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