# CVE-2026-63407

## Summary

- **CVE ID:** CVE-2026-63407
- **Severity:** HIGH
- **CVSS Score:** 8.2 (CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:L/A:N)
- **CWE:** CWE-942
- **Published:** Aug 19, 2026
- **Last Modified:** Aug 25, 2026

## Description

Grav API Plugin is a RESTful API for Grav CMS that provides full headless access to your site's content. Prior to 1.0.0-rc.16, the Grav API plugin CorsMiddleware returns Access-Control-Allow-Origin: * and permissive OPTIONS responses for authenticated /api/v1 endpoints. JavaScript from any origin can submit an attacker-obtained JWT through the Authorization or X-API-Token header, read the authenticated response, and perform write operations with the token owner's privileges, enabling data exfiltration and account modification. This issue is fixed in version 1.0.0-rc.16.

## Affected Products

- getgrav — grav-plugin-api (< 1.0.0-rc.16)

## References

- [CNA](https://github.com/getgrav/grav/security/advisories/GHSA-93px-98wh-6fj2)
- [CNA](https://github.com/getgrav/grav-plugin-api/commit/56ae2ca3bf36c8299a4b3d376c6a20e8c0ed5ba9)
- [CNA](https://github.com/getgrav/grav-plugin-api/releases/tag/1.0.0-rc.16)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.27%
- **EPSS Percentile:** 19.2

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-11._