CVE-2026-61456

MEDIUM 4.6

Grav before 1.0.3 Stored XSS via SVG Upload API

CVSS Score

4.6

EPSS Score

0.0%

EPSS Percentile

0th

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	CWE-79
Vendor	getgrav
Product	grav
Published	Jul 10, 2026
Last Updated	Jul 10, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

Required

Scope

Unchanged

Confidentiality

Low

Integrity

Low

Availability

None

Affected Versions

getgrav / grav

0 < 1.0.3

References

NVD ↗ CVE.org ↗ EPSS Data ↗

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

Credits

🔍 alienkeric