Vulnerability · Published Aug 19, 2026 · Assigned by GitHub_M

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

High 8.2

In plain English

A high-severity security flaw in grav-plugin-api from getgrav. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 32% of all known vulnerabilities).

Severity (CVSS 3.1)8.2High

Exploit odds (30 days)0.4%top 68.3% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official 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 (as reported)

Vendor	Product	Versions
getgrav	grav-plugin-api	< 1.0.0-rc.16

Weakness: CWE-942 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:L/A:N

References

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