Cross-Origin Resource Sharing Flaw in Grav API Plugin for Grav CMS
CVE-2026-63407

8.2HIGH

Key Information:

Vendor

Getgrav

Status
Grav-plugin-api
Vendor
CVE Published:
19 August 2026

What is CVE-2026-63407?

The Grav API Plugin, a RESTful API for Grav CMS, has a vulnerability that permits unauthenticated JavaScript from any origin to interact with authenticated API endpoints. This occurs due to the CorsMiddleware returning a permissive Access-Control-Allow-Origin header and weak OPTIONS responses. Attackers can exploit this flaw by submitting a stolen JWT via the Authorization header or X-API-Token, potentially leading to unauthorized data access and modifications on the victim's account. This vulnerability is resolved in version 1.0.0-rc.16.

Affected Version(s)

grav-plugin-api < 1.0.0-rc.16

References

https://github.com/getgrav/grav/security/advisories/GHSA-...
x_refsource_CONFIRM
https://github.com/getgrav/grav-plugin-api/commit/56ae2ca...
x_refsource_MISC
https://github.com/getgrav/grav-plugin-api/releases/tag/1...
x_refsource_MISC

CVSS V3.1

Score:
8.2
Severity:
HIGH
Confidentiality:
High
Integrity:
Low
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
Required
Scope:
Changed

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.