CVE-2026-72583 PUBLISHED

fastschema - Stored Cross-Site Scripting via MIME Type Bypass in File Upload

Assigner: TuranSec
Reserved: 10.08.2026 Published: 10.08.2026 Updated: 10.08.2026

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.

Metrics

CVSS 3.1

CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
CVSS Score: 5.4

Attack Vector	Network	Scope	Changed
Attack Complexity	Low	Confidentiality Impact	Low
Privileges Required	Low	Integrity Impact	Low
User Interaction	Required	Availability Impact	None

CVSS 3.1

Product Status

Vendor	fastschema
Product	fastschema
Versions	Default: unknown affected from 0 to 0.15.1 (incl.)

Credits

Komiljon Ayubov finder

References

Product
Vulnerable File

Problem Types

CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') CWE