What’s Vulnerable › Vulnerabilities

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

• Severity: high (CVSS 8.2 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-08-19 · updated 2026-09-09
• Weakness: CWE-942

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: before 1.0.0-rc.16

References

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

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