CVE-2026-61456

The Grav API plugin (getgrav/grav-plugin-api) before 1.0.3 fails to sanitize SVG files uploaded through the POST /api/v1/media endpoint. The HandlesMediaUploads::processUploadedFile() method validates only the file extension and never invokes Security::sanitizeSVG(), so an authenticated attacker with the api.media.write permission can upload an SVG containing arbitrary JavaScript. The file is stored unmodified and served with Content-Type: image/svg+xml; when an administrator opens it in a browser (directly or via <object>/<iframe>), the embedded script executes in their session context, enabling cookie theft and session hijacking.

• CWE-79

• https://github.com/getgrav/grav/security/advisories/GHSA-7vhm-8x52-2r5p
• https://www.vulncheck.com/advisories/grav-before-stored-xss-via-svg-upload-api
• https://github.com/getgrav/grav/security/advisories/GHSA-7vhm-8x52-2r5p

Published

Jul 10, 2026

Last Modified

Jul 10, 2026

Status

Deferred

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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