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

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.

Scores

EPSS (exploitation in 30 days)

0.38% · top 68% of all CVEs (7 Nov 2026)

CISA SSVC

Exploitation: none · Automatable: no · Technical impact: partial

The list uses the assigner's score when there is one, then CISA's, then NVD's: High 8.2.

Weakness

• CWE-942: Permissive Cross-domain Policy with Untrusted Domains (opens in a new tab)All about CWE-942 and its CVEs

Affected products

• getgrav · grav-plugin-api

  • affected < 1.0.0-rc.16

References (3)

• https://github.com/getgrav/grav/security/advisories/GHSA-93px-98wh-6fj2 (opens in a new tab)x_refsource_CONFIRMexploit
• https://github.com/getgrav/grav-plugin-api/commit/56ae2ca3bf36c8299a4b3d376c6a20e8c0ed5ba9 (opens in a new tab)x_refsource_MISC
• https://github.com/getgrav/grav-plugin-api/releases/tag/1.0.0-rc.16 (opens in a new tab)x_refsource_MISC

Sources

The same CVE in the primary databases and aggregators, to check against.

• CVE.org record (opens in a new tab)
• CVE List JSON (GitHub) (opens in a new tab)
• NVD (opens in a new tab)
• FIRST EPSS (opens in a new tab)
• OSV.dev (opens in a new tab)
• GitHub Advisories (opens in a new tab)
• CIRCL Vulnerability-Lookup (opens in a new tab)

Badge for a README or a ticket

[![CVE-2026-63407](https://trackcve.app/badge/CVE-2026-63407.svg)](https://trackcve.app/cve/CVE-2026-63407)

Record last updated 25 Aug 2026, 02:12 UTC.