# CVE-2026-33768: Astro @astrojs/vercel path override authentication bypass

Source: https://junglewise.ai/threats/cve-2026-33768-astro-astrojs-vercel-path-override-authentication-bypass  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-03-26. Updated: 2026-09-25  
License: CC BY 4.0 with a link back

CVE-2026-33768 · Severity: low · CVSS 3.1 · Published 2026-03-26

Astro's Vercel integration contains an authentication bypass vulnerability in its serverless deployment layer. Attackers can manipulate HTTP request paths using headers or query parameters to bypass Vercel's firewall rules and access protected pages and APIs without authorization. This affects deployments without Edge Middleware, allowing unauthorized read and write access to restricted endpoints.

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

## Quick answers

**Is CVE-2026-33768 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-33768 being exploited in the wild.

**How severe is CVE-2026-33768?** Low severity, with a CVSS score of 3.1, published 26 March 2026.

**Which products and versions are affected?** @astrojs/vercel (npm) SEMVER:introduced=0,fixed=10.0.2.

**Is there a fix for CVE-2026-33768?** Yes. @astrojs/vercel (npm): upgrade to 10.0.2 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-33768 attacked?** It is attacked over the network, in a software library.

**Am I affected by CVE-2026-33768?** Check whether you run @astrojs/vercel (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

- @astrojs/vercel (npm): upgrade to 10.0.2 or later

  ```sh
  npm install @astrojs/vercel@10.0.2
  ```


## Technical details

The @astrojs/vercel serverless entrypoint reads the x-astro-path header and x_astro_path query parameter to rewrite request paths without any authentication or validation. While this mechanism is intended for legitimate use by Edge Middleware (which overwrites client-supplied values), deployments without Edge Middleware expose this path-rewriting to external callers. An attacker can craft requests to /public?x_astro_path=/admin/secret to bypass Vercel's platform-level firewall rules; the firewall evaluates the public path while the serverless function executes the admin path. The HTTP method and body are preserved through the override, affecting GET, POST, PUT, and DELETE requests. Affected versions include @astrojs/vercel ≤ 10.0.0; the vulnerability is confirmed exploitable on Astro 5.18.1 + @astrojs/vercel 9.0.4. Patch version 10.0.2 is available.

## Affected products

- Astro @astrojs/vercel <= 10.0.0

## Identifiers

- CVE-2026-33768
- GHSA-mr6q-rp88-fx84

## Timeline

- 2026-03-26: disclosed
- 2026-03-26: patched: Patched in @astrojs/vercel 10.0.2

## References

- [https://github.com/withastro/astro/security/advisories/GHSA-mr6q-rp88-fx84](https://github.com/withastro/astro/security/advisories/GHSA-mr6q-rp88-fx84)

## Related threats

- [Astro Vercel ISR unauthenticated path override](https://junglewise.ai/threats/cve-2026-73424-astro-vercel-isr-unauthenticated-path-override)