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.

CVSS 4.0

5.1CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N

CVSS 3.1

4.6CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N

EPSS

0.2% chance of exploitation in the next 30 days; higher than 14% of CVEs (scores of 2026-10-25)

CWE

CWE-79

Published

2026-07-10

Modified

2026-10-25

Record from

the NVD, synced 2026-10-25

References

• 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

Check your stackJSON