CVE-2026-27641 CRITICAL

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

Vendor Jugmac00
Product flask-reuploaded
Weakness CWE-1336
Published February 25, 2026
Last update February 25, 2026
View on NVD All CVEs

CVSS base score

9.8/10
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Confidentiality High
Integrity High

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

What the vulnerability does

01Description

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.

Key dates

02Disclosure timeline

February 25, 2026 CVE published
February 25, 2026 Record updated

Related vulnerabilities

04Related CVE

CVE-2026-28695 Craft affected by authenticated RCE via Twig SSTI - create() function + Symfony Process gadget CVE-2025-12107 Potential authenticated Server-Side Template Injection (SSTI) vulnerability. CVE-2023-5764 Ansible: template injection CVE-2022-25813 Server-Side Template Injection affecting the ecommerce plugin of Apache OFBiz CVE-2026-41065 Tautulli Vulnerable to Unauthenticated/Authenticated Remote Code Execution via Newsletter Custom Template Directory