CVE-2026-27641
Flask-Reuploaded vulnerable to Remote Code Execution via Server-Side Template Injection
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.
INFO
Published Date :
Feb. 25, 2026, 4:16 a.m.
Last Modified :
Feb. 27, 2026, 6:40 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | CRITICAL | [email protected] |
Solution
- Update Flask-Reuploaded to version 1.5.0 or later.
- Avoid passing user input to the 'name' parameter.
- Use auto-generated filenames whenever possible.
- Implement strict input validation for the 'name' parameter.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-27641.
| URL | Resource |
|---|---|
| https://github.com/jugmac00/flask-reuploaded/commit/d64c6b2f71cb73734fc38baa0e3e156926361288 | Patch |
| https://github.com/jugmac00/flask-reuploaded/pull/180 | Issue Tracking Patch |
| https://github.com/jugmac00/flask-reuploaded/security/advisories/GHSA-65mp-fq8v-56jr | Exploit Vendor Advisory |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-27641 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-27641
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-27641 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-27641 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
Initial Analysis by [email protected]
Feb. 27, 2026
Action Type Old Value New Value Added CWE CWE-22 Added CPE Configuration OR *cpe:2.3:a:jugmac00:flask-reuploaded:*:*:*:*:*:python:*:* versions up to (excluding) 1.5.0 Added Reference Type GitHub, Inc.: https://github.com/jugmac00/flask-reuploaded/commit/d64c6b2f71cb73734fc38baa0e3e156926361288 Types: Patch Added Reference Type GitHub, Inc.: https://github.com/jugmac00/flask-reuploaded/pull/180 Types: Issue Tracking, Patch Added Reference Type GitHub, Inc.: https://github.com/jugmac00/flask-reuploaded/security/advisories/GHSA-65mp-fq8v-56jr Types: Exploit, Vendor Advisory -
New CVE Received by [email protected]
Feb. 25, 2026
Action Type Old Value New Value Added 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. Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Added CWE CWE-1336 Added Reference https://github.com/jugmac00/flask-reuploaded/commit/d64c6b2f71cb73734fc38baa0e3e156926361288 Added Reference https://github.com/jugmac00/flask-reuploaded/pull/180 Added Reference https://github.com/jugmac00/flask-reuploaded/security/advisories/GHSA-65mp-fq8v-56jr