XSS in Getgrav Grav
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.
Vulnerability class: XSS (Cross-Site Scripting)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 4.6 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N.
EPSS exploit prediction
EPSS: 0.002 (13.2th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 13th percentile — 13.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: 0.000
Affected products
- Getgrav Grav — versions 0, 1.0.3
Weakness classification (CWE)
References
- github.com/getgrav/grav/security/advisories/GHSA-7vhm-8x52-2r5p (vendor-advisory)
- www.vulncheck.com/advisories/grav-before-stored-xss-via-svg-upload-api (third-party-advisory)
Frequently asked questions
- What is CVE-2026-61456?
- CVE-2026-61456 is a medium-severity vulnerability in Getgrav Grav, classified under Cross-site Scripting. CVSS score: 4.6/10. Published 2026-07-10.
- How severe is CVE-2026-61456?
- Medium severity. CVSS v3 base score is 4.6 out of 10.