High severity · published Aug 19, 2026
CVE-2026-63407
Grav API Plugin: CORS 'Access-Control-Allow-Origin: *' on Authenticated API Responses
8.2
CVSS
0.4%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:L/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
Required
Confidentiality
High
Integrity
Low
Availability
None
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 31% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
GR
grav-plugin-api · getgrav
< 1.0.0-rc.16 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-63407
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-63407
github.com
https://github.com/getgrav/grav-plugin-api/commit/56ae2ca3bf36c8299a4b3d376c6a20e8c0ed5ba9
github.com
https://github.com/getgrav/grav-plugin-api/releases/tag/1.0.0-rc.16
github.com
https://github.com/getgrav/grav/security/advisories/GHSA-93px-98wh-6fj2
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