CVE-2026-27641
CRITICAL
GHSA-65mp-fq8v-56jr
CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Lifecycle Timeline
4Description
Flask-Reuploaded provides file uploads for Flask. A critical path traversal and extension bypass vulnerability in versions prior to 1.5.0 allows remote attackers to achieve arbitrary file write and remote code execution through Server-Side Template Injection (SSTI). Flask-Reuploaded has been patched in version 1.5.0. Some workarounds are available. Do not pass user input to the `name` parameter, use auto-generated filenames only, and implement strict input validation if `name` must be used.
Analysis
Path traversal and extension bypass in Flask-Reuploaded file upload library. Allows uploading files with arbitrary extensions to arbitrary directories. …
Sign in for full analysis, threat intelligence, and remediation guidance.
Remediation
Within 24 hours: Identify all systems and applications using Flask-Reuploaded versions up to 1.5.0 and assess exposure; isolate critical affected systems if patching cannot be completed immediately. Within 7 days: Apply available patches to all affected systems and verify successful deployment across production and non-production environments. …
Sign in for detailed remediation steps.
Priority Score
Share
External POC / Exploit Code
Leaving vuln.today