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CVE-2026-63407

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

Published: Aug 19, 2026Updated: Aug 25, 2026 Sources: CVE List NVDCWE-942
8.2HIGH
NVD MITRE
EPSS Score
0.3%
Top 81.0%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
No Fix Available
Self-Check
Not available

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.

No summary for this CVE yet.

CVSS Vector Breakdown

AV:NAC:LPR:NUI:RS:CC:HI:LA:N
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:RUser Interaction
Required
Scope
S:CScope
Changed
Impact
C:HConfidentiality
High
I:LIntegrity
Low
A:NAvailability
None
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Weaknesses

CWE-942

Affected Products

getgrav
oss-projectaka grav, getgrav/grav, grav-plugin-admin
grav-plugin-apiOn-premWeb App
Web & CMS Plugins / cms-core

Exploitability

No known exploits, KEV entries, or remediation guidance available for this vulnerability yet.
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References

https://github.com/getgrav/grav/security/advisories/GHSA-93px-98wh-6fj2
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

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