Vulnerability · Published Aug 19, 2026 · Assigned by GitHub_M

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

Medium 4.6

In plain English

A medium-severity cross-site scripting in grav-plugin-api from getgrav. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 22% of all known vulnerabilities).

Severity (CVSS 3.1)4.6Medium

Exploit odds (30 days)0.3%top 78.5% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official 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.

Affected products (as reported)

Vendor	Product	Versions
getgrav	grav-plugin-api	< 1.0.2

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

References

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