Grav API Plugin: CORS 'Access-Control-Allow-Origin: *' on Authenticated API Responses (CVE-2026-63407) | HOL Guard CVE

Unknown severity · Source severity not reportedCVE-2026-63407

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

Answer in brief

CVE-2026-63407 records a Unknown severity vulnerability in Grav API Plugin: CORS 'Access-Control-Allow-Origin: *' on Authenticated API Responses. The current sources do not mark it as known exploited. The current feed maps getgrav/grav-plugin-api (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Aug 19, 2026Updated Aug 19, 2026Source checked Aug 19, 2026First seen by HOL Aug 19, 2026Material review Aug 19, 2026

Upstream Advisory

Key facts

Risk: Unknown severitySource severity not reported
Exploitation: Not marked as known exploited
Affected software: 1 mapped package or product
Fix availability: Not reported

Why this deserves its current priority

A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps getgrav/grav-plugin-api (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
getgrav/grav-plugin-apigeneric	< 1.0.0-rc.16	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for getgrav/grav-plugin-api.
Review the reported fix. Monitor this advisory for an available fix and review any installs of the affected package.

Evidence timeline and material changes

Published upstream
Aug 19, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Aug 19, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Aug 19, 2026

Sources and claim methodology

Upstream source 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.

Quoted source text, attributed separately from HOL analysis.