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CVE-2026-46342· NVD / CVE Program· CNA GitHub_M

Nuxt: `__nuxt_island` endpoint does not bind responses to request props, enabling shared-cache poisoning

Noroxi assessment

Priority: Monitor (action score 9/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.13% (FIRST EPSS).
  • Anyone who can reach it over the internet can trigger it. No account or password is required. No special conditions are required; it is repeatable.
  • Fixed version: @nuxt/nitro-server (npm) 3.21.6, 4.4.6; nuxt (npm) 3.21.6, 4.4.6.

Low priority for now. Upgrade to @nuxt/nitro-server (npm) 3.21.6, 4.4.6; nuxt (npm) 3.21.6, 4.4.6 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

Nuxt is an open-source web development framework for Vue.js. In Nuxt versions 3.1.0 to before 3.21.6 and 4.0.0-alpha.1 to before 4.4.6 and @nuxt/nitro-server versions 3.20.0 to before 3.21.6 and 4.0.0-alpha.1 to before 4.4.6, the /__nuxt_island/* endpoint accepts attacker-controlled props query/body parameters and renders any island component without verifying that the URL-resident hash (<Name>_<hashId>.json) was actually issued for those inputs by <NuxtIsland>. The hash is computed and embedded client-side but never validated server-side, so the same path can return materially different responses depending on the query. This issue has been patched in versions 3.21.6 and 4.4.6.

LowCVSS 2.3 · v4.0—No exploit Fix available
Published
Jun 12, 2026
Updated
Jun 17, 2026
EPSS
0.1% · 2th percentile

Report tools

JSON

Action score

9

Monitor

Low priority for now.

CVSS
9 / 40 · 2.3 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.1%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
—
CNA · GitHub_M
2.3
NVD has not scored this yet; the score shown is the CNA’s.

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

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2026-46342

When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
nuxtnuxt
nuxtnuxt\/nitro-server

Limit the impact of XSS

This is a cross-site scripting (XSS) vulnerability. A well-configured Content-Security-Policy doesn't fix it, but greatly reduces its impact. Check your site's CSP and other security headers for free.

Check security headers

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • nuxt nuxt3.1.0 and later · before 3.21.6
  • nuxt nuxt4.0.0 and later · before 4.4.5
  • nuxt nuxt/nitro-server3.20.0 and later · before 3.21.6
  • nuxt nuxt/nitro-server4.2.0 and later · before 4.4.6

Versions reported by the vendor

Affected version ranges reported by the assigning authority (GitHub_M). Independent of NVD's CPE analysis and usually ahead of it.

  • nuxt nuxt

    • >= 3.1.0, < 3.21.6, >= 4.0.0-alpha.1, < 4.4.6affected

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
npm@nuxt/nitro-serverfrom 3.20.0 · before 3.21.63.21.6
npm@nuxt/nitro-serverfrom 4.2.0 · before 4.4.64.4.6
npmnuxtfrom 3.1.0 · before 3.21.63.21.6
npmnuxtfrom 4.0.0-alpha.1 · before 4.4.64.4.6

Same product

nuxt: all records

Other highest-scoring records for the same primary product.

  • CVE-2023-3224Code Injection in nuxt/nuxt
    57Plan
  • CVE-2026-53721Nuxt: Route-rule middleware bypass via case-sensitivity mismatch between vue-router and the routeRules matcher
    35Monitor
  • CVE-2024-34344Remote code execution via the browser when running the test locally in nuxt
    35Monitor

Published before and after this one in the same product

  • ← EarlierCVE-2025-59414Sep 17, 2025 · Nuxt Client-Side Path Traversal in Nuxt Island Payload Revival
    12Monitor
  • ← EarlierCVE-2026-45669Jun 12, 2026 · Nuxt: Reflected XSS in `navigateTo()` external redirect
    21Monitor
  • Later →CVE-2026-47200Jun 12, 2026 · Nuxt: Route middleware not enforced when rendering `.server.vue` pages via `/__nuxt_island/page_*`
    25Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
npm:@nuxt/nitro-server3.21.6Package registry (OSV)
npm:@nuxt/nitro-server4.4.6Package registry (OSV)
npm:nuxt3.21.6Package registry (OSV)
npm:nuxt4.4.6Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

  • CVE-2026-5669810 days apartNuxt - Cross-Site Scripting via navigateTo open Option
    21Monitor
  • CVE-2026-537220 days apartNuxt: Reflected XSS in `<NuxtLink>` via unsanitised `javascript:` or `data:` URL
    20Monitor
  • CVE-2026-563178 days apartNuxt - Cross-Site Scripting via NoScript Component Slot Content
    9Monitor

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

The product’s vendor appears in a public program. Matched by name; verify the scope text in the program.

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • No account or password is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
Integrity
Availability
Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
P
Scope
X

Weakness class (CWE)

CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

CVSS vector

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

nvd-secondary

Root cause

User content is inserted into the page as HTML. The browser interprets the content as code rather than data.

The bug in code

The whole CWE-79 class

A representative example of this vulnerability class. Not the vendor's source code; it shows the faulty pattern and its fix.

Vulnerable

ts
commentEl.innerHTML = comment.body;

Fixed

ts
commentEl.textContent = comment.body;

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

ATT&CK techniques

—

Change log

  1. Fix✗ → ✓

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References

Show all references (1 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records