Goal Reached Thanks to every supporter — we hit 100%!

Goal: 1000 CNY · Raised: 1359 CNY

100%
Buy Us a Coffee

CVE-2026-72583— fastschema - Stored Cross-Site Scripting via MIME Type Bypass in File Upload

Quick assessment

Affected
fastschema fastschema
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

FastSchema是fastschema组织的一款开发框架。 FastSchema 0.15.1及之前版本存在跨站脚本漏洞，该漏洞源于pkg/rclonefs/base.go中的PutMultipart函数仅验证客户端提供的Content-Type头而未检查实际文件内容，导致低权限用户可将文件重命名为.jpg并指定image/svg+xml绕过MIME类型白名单检查，上传包含恶意JavaScript的SVG文件，容易受到存储型跨站脚本攻击。

CVSS 5.4 · Medium EPSS 0.26% · P17

Affected Version Matrix 1

VendorProduct Version RangeStatus
fastschema fastschema ≤ 0.15.1 affected
Get alerts for future matching vulnerabilities Log in to subscribe

I. Basic Information for CVE-2026-72583

Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗

Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.

Vulnerability Title
fastschema - Stored Cross-Site Scripting via MIME Type Bypass in File Upload
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: CVE Program / CVE List V5
Vulnerability Title
FastSchema 跨站脚本漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
FastSchema是fastschema组织的一款开发框架。 FastSchema 0.15.1及之前版本存在跨站脚本漏洞，该漏洞源于pkg/rclonefs/base.go中的PutMultipart函数仅验证客户端提供的Content-Type头而未检查实际文件内容，导致低权限用户可将文件重命名为.jpg并指定image/svg+xml绕过MIME类型白名单检查，上传包含恶意JavaScript的SVG文件，容易受到存储型跨站脚本攻击。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
fastschema fastschema 0 ~ 0.15.1 -

II. Public POCs for CVE-2026-72583

# POC Description Source Link Shenlong Link
AI-Generated POC Premium

No public POC found.

Login to generate AI POC

III. Intelligence Information for CVE-2026-72583

请登录查看更多情报信息。

Vendor Pages for CVE-2026-72583 (1)

Same Patch Batch · fastschema · 2026-08-10 · 3 CVEs total

CVE-2026-72582 7.5 HIGH fastschema - Unauthenticated NULL Pointer Dereference DoS in Account Recovery Endpoint
CVE-2026-72584 7.4 HIGH fastschema - TOCTOU Race Condition Bypasses OTP Attempt Limit in Account Recovery

IV. Related Vulnerabilities

Same product: fastschema
Same vendor: fastschema
Same weakness: CWE-79