---
id: CVE-2026-72583
title: >-
  A stored cross-site scripting (XSS) vulnerability in fastschema through
  v0.15.1 allows a low-privileged authenticated user to upload an SVG file
  containing malicious JavaScript by bypassing the MIME type allow-list check.
summary: >-
  A stored cross-site scripting (XSS) vulnerability in fastschema through
  v0.15.1 allows a low-privileged authenticated user to upload an SVG file
  containing malicious JavaScript by bypassing the MIME type allow-list check.
severity: medium
cvss: 5.4
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N'
cwe:
  - CWE-79
published: '2026-08-10'
updated: '2026-08-28'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-72583'
references:
  - url: 'https://github.com/fastschema/fastschema'
    label: 309f9ea4-e3e9-4c6c-b79d-e8eb01244f2c
  - url: 'https://github.com/fastschema/fastschema/blob/main/pkg/rclonefs/base.go'
    label: 309f9ea4-e3e9-4c6c-b79d-e8eb01244f2c
tags:
  - nvd
epss: 0.00255
epssPercentile: 0.1524
ingestedAt: '2026-08-29T16:39:15.392Z'
---

## Overview

A stored cross-site scripting (XSS) vulnerability in fastschema through v0.15.1 allows a low-privileged authenticated user to upload an SVG file containing malicious JavaScript by bypassing the MIME type allow-list check.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.