Vulnerability · Published Jul 10, 2026 · Assigned by VulnCheck

CVE-2026-61456Grav before 1.0.3 Stored XSS via SVG Upload API

Medium 4.6

In plain English

A medium-severity cross-site scripting in grav from getgrav. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 7% of all known vulnerabilities).

Severity (CVSS 3.1)4.6Medium

Exploit odds (30 days)0.2%top 93.3% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official description

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.

Affected products (as reported)

Vendor	Product	Versions
getgrav	grav	0 – before 1.0.3

Weakness: CWE-79 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N

References

GitHub Security Advisory (GHSA-7vhm-8x52-2r5p) vendor-advisory
VulnCheck Advisory: Grav before 1.0.3 Stored XSS via SVG Upload API third-party-advisory