What’s Vulnerable › Vulnerabilities

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

• Severity: medium (CVSS 5.4 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-08-10 · updated 2026-10-24
• Weakness: CWE-79

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.

Affected products

• fastschema: through 0.15.1

References

• https://github.com/fastschema/fastschema
• https://github.com/fastschema/fastschema/blob/main/pkg/rclonefs/base.go

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