CVE-2026-61607Grav API Plugin: Stored XSS via SVG Upload - API Media Pipeline Bypasses Sanitizer

Description

Grav API Plugin is a RESTful API for Grav CMS that provides full headless access to your site's content. Prior to 1.0.2, the Grav API plugin POST /api/v1/media pipeline in HandlesMediaUploads::processUploadedFile() validates an SVG filename extension but does not invoke Security::sanitizeSVG(). An attacker with api.media.write permission can store an SVG containing JavaScript, and the server returns the file as Content-Type: image/svg+xml so the script executes when a victim opens it, allowing session data theft and authenticated actions. This issue is fixed in version 1.0.2.

Data: CVE.org, NVD, CISA KEV, FIRST EPSS, Ubuntu. Published as the sources state it, in English.

Affected products and versions

References and patches

• https://github.com/getgrav/grav/security/advisories/GHSA-7vhm-8x52-2r5p
• https://github.com/getgrav/grav-plugin-api/commit/d25eedb84a387f2c71b12a374f2a4b3d74339a7e
• https://github.com/getgrav/grav-plugin-api/releases/tag/1.0.2