# CVE-2026-71315: Nuxt authorization bypass via mixed-case route rules

Source: https://junglewise.ai/threats/cve-2026-71315-nuxt-authorization-bypass-via-mixed-case-route-rules  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-08-05. Updated: 2026-08-05  
License: CC BY 4.0 with a link back

CVE-2026-71315 · Severity: high · CVSS 8.2 · Published 2026-08-05

Nuxt is a popular web framework used to build high-performance websites and applications. A security flaw was discovered where certain protection rules (such as login requirements) are ignored if a user accesses a web address using a mix of uppercase and lowercase letters. This could allow an unauthorized person to view private data or access restricted administrative pages simply by changing the capitalization of the URL.

Technologies: [nuxt (npm)](https://junglewise.ai/threats/technologies/nuxt). Vendors: [npm](https://junglewise.ai/threats/vendors/npm).

## Quick answers

**Is CVE-2026-71315 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-71315 being exploited in the wild.

**How severe is CVE-2026-71315?** High severity, with a CVSS score of 8.2, published 5 August 2026.

**Which products and versions are affected?** nuxt (npm) SEMVER:introduced=4.4.7,fixed=4.5.1.

**Is there a fix for CVE-2026-71315?** Yes. nuxt (npm): upgrade to 4.5.1 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-71315 attacked?** It is attacked over the network, in a software library.

**Am I affected by CVE-2026-71315?** Check whether you run nuxt (npm) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- nuxt (npm): upgrade to 4.5.1 or later

  ```sh
  npm install nuxt@4.5.1
  ```


## Technical details

Nuxt matches route rules case-insensitively by default, but an incomplete fix for a previous vulnerability (CVE-2026-53721) resulted in an asymmetric matching process. While the lookup path is folded to lowercase, the route-rule keys compiled into the matcher remain verbatim (mixed-case). Consequently, rules defined with uppercase characters (e.g., /Admin) or derived from PascalCase page files fail to match. This allows attackers to bypass 'appMiddleware' auth gates and other route-level protections by requesting paths that vue-router serves case-insensitively but Nuxt fails to protect. The issue is resolved in versions 4.5.1 and 3.21.10 by ensuring both keys and lookups are normalized symmetrically.

## Affected products

- Nuxt nuxt >= 4.4.7, < 4.5.1
- Nuxt nuxt >= 3.21.7, < 3.21.10

## Identifiers

- CVE-2026-71315
- GHSA-hxvh-4h3w-prp9

## Timeline

- 2026-07-27: disclosed
- 2026-08-05: advisory
- 2026-08-05: patched

## References

- [https://api.github.com/users/Pig-Tail](https://api.github.com/users/Pig-Tail)
- [https://github.com/Pig-Tail](https://github.com/Pig-Tail)
- [https://api.github.com/users/Pig-Tail/gists%7B/gist_id%7D](https://api.github.com/users/Pig-Tail/gists%7B/gist_id%7D)
- [https://api.github.com/users/Pig-Tail/repos](https://api.github.com/users/Pig-Tail/repos)
- [https://avatars.githubusercontent.com/u/15832659?v=4](https://avatars.githubusercontent.com/u/15832659?v=4)
- [https://api.github.com/users/Pig-Tail/events%7B/privacy%7D](https://api.github.com/users/Pig-Tail/events%7B/privacy%7D)

## Related threats

- [Nuxt path traversal via dot segment normalization bypass](https://junglewise.ai/threats/cve-2026-119200-nuxt-is-an-open-source-web-development-framework-for-vue-js-from)
- [Nuxt stored cross-site scripting in useHeadSafe server island rendering](https://junglewise.ai/threats/cve-2026-114133-nuxt-is-an-open-source-web-development-framework-for-vue-js-from)
- [Nuxt case-sensitive route matching bypass](https://junglewise.ai/threats/cve-2026-114132-nuxt-is-an-open-source-web-development-framework-for-vue-js)
- [Nuxt route-rule bypass via percent-encoded segments](https://junglewise.ai/threats/cve-2026-114131-nuxt-is-an-open-source-web-development-framework-for-vue-js-from)
- [Nuxt XSS via protocol bypass in NuxtLink](https://junglewise.ai/threats/cve-2026-114130-nuxt-is-an-open-source-web-development-framework-for-vue-js)