nuxt vulnerable to Cross-site Scripting in navigateTo if used after SSR

Exploitation

No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.

CVSS 4.0

5.1 · CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N · score source

EPSS

• CVE-2024-34343: 0.44% estimated exploitation activity in the next 30 days; percentile 38.27 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.

As published by the source; long descriptions are shortened.

Summary The navigateTo function attempts to blockthe javascript: protocol, but does not correctly use API's provided by unjs/ufo. This library also contains parsing discrepancies. Details The function first tests to see if the specified URL has a protocol. This uses the unjs/ufo package for URL parsing. This function works effectively, and returns true for a javascript: protocol. After this, the URL is parsed using the parseURL function. This function will refuse to parse poorly formatted URLs. Parsing javascript:alert(1) returns null/"" for all values. Next, the protocol of the URL is then checked using the isScriptProtocol function. This function simply checks the input against a list of protocols, and does not perform any parsing. The combination of refusing to parse poorly formatted URLs, and not performing additional parsing means that script checks fail as no protocol can be found. Even if a protocol was identified, whitespace is not stripped in the parseURL implementation,…

Published by the source

5 Aug 2024, 19:49 UTC

Last modified by the source

15 May 2025, 21:26 UTC

Source last checked

26 Oct 2026, 12:37 UTC

1. Revision 3 · amended · 26 Oct 2026

   Amended from ghsa record GHSA-vf6r-87q4-2vjf

2. Revision 2 · amended · 25 Oct 2026

   Reviewed OSV alias/range/CVSS4 correction; package source scopes and original publication preserved. No customer finding resolved.

3. Revision 1 · created · 24 Oct 2026

   Published from osv record GHSA-vf6r-87q4-2vjf

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# Patch Next advisory brief: CVE-2024-34343

Advisory: nuxt vulnerable to Cross-site Scripting in navigateTo if used after SSR
IDs: CVE-2024-34343, GHSA-vf6r-87q4-2vjf
Record: https://patchnext.com/advisories/cve-2024-34343 (revision 3, source checked 26 Oct 2026, 12:37 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Medium (CVSS 5.1)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: nuxt 3.12.4. A vendor fix does not mean a deployment is fixed.

## Affected components
- npm nuxt: affected < 3.12.4; fixed in 3.12.4

## Suggested inspection (read-only)
- `npm ls nuxt --all`: lists every installed copy and version, including transitive ones. Run in the project root after `npm ci`.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on nuxt.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://osv.dev/vulnerability/GHSA-vf6r-87q4-2vjf (OSV record GHSA-vf6r-87q4-2vjf lists affected ranges: npm nuxt >=0 <3.12.4 (fixed))
- Verified: https://github.com/advisories/GHSA-vf6r-87q4-2vjf (GitHub-reviewed advisory GHSA-vf6r-87q4-2vjf lists affected ranges: npm nuxt >=0 <3.12.4)

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