CVE-2026-27641

CRITICAL9.8

Flask-Reuploaded vulnerable to Remote Code Execution via Server-Side Template Injection

Published Feb 25, 2026

Modified 1 weeks ago

Details

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.

References

WEB

https://github.com/jugmac00/flask-reuploaded/commit/d64c6b2f71cb73734fc38baa0e3e156926361288

WEB

https://github.com/jugmac00/flask-reuploaded/pull/180

WEB

https://github.com/jugmac00/flask-reuploaded/security/advisories/GHSA-65mp-fq8v-56jr

ADVISORY

https://www.cve.org/CVERecord?id=CVE-2026-27641

CVSS Analysis

CVSS v3.1

9.8