CVE-2026-27641 – Flask-Reuploaded vulnerable to Remote Code Execution via Server-Side Template Injection

CVE ID : CVE-2026-27641

Published : Feb. 25, 2026, 4:16 a.m. | 51 minutes ago

Description : 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.

Severity: 9.8 | CRITICAL

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