CVE-2026-63407 HIGH

CVE-2026-63407: Grav API Plugin: CORS 'Access-Control-Allow-Origin: *' on Authenticated API Responses

Vendor Getgrav
Product grav-plugin-api
Weakness CWE-942
Published August 19, 2026
Last update August 19, 2026
View on NVD All CVEs

CVSS base score

8.2/10
Attack vector Network
Attack complexity Low
Privileges required None
User interaction Required
Confidentiality High
Integrity Low

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:L/A:N

What the vulnerability does

01Description

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.

Key dates

02Disclosure timeline

August 19, 2026 CVE published