Vulnerability Report

CVE-2026-27641

RCE

Title: Path traversal and SSTI in Flask-Reuploaded

Arbitrary File Access

Proof Of Concept

PoC Available for CVE-2026-27641

CWE Category CWE-1336
Published Date Feb 25, 2026
Modified Date Feb 27, 2026
Exploit Status Available
Score 9.8 CVSS v3.1
Exploit Probability (EPSS)
1.05%

Vulnerability Summary

CVE-2026-27641: 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.

Impacted Vendors

J
jugmac00 1

Reference Links

https://github.com/jugmac00/flask-reuploaded/commit/d64c6b2f71cb73734fc38baa0e3e156926361288 https://github.com/jugmac00/flask-reuploaded/pull/180 https://github.com/jugmac00/flask-reuploaded/security/advisories/GHSA-65mp-fq8v-56jr
CVSS v3.1
Source Entity [email protected]
Severity CRITICAL
9.8
Attack Vector
NETWORK
Complexity
LOW
Privileges
N/A
Interaction
NONE
Confidentiality
N/A
Integrity
N/A
Availability
N/A
Scope
UNCHANGED
RAW VECTOR CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Associated Attack Patterns (CAPEC)

Total: Patterns

CVE-2026-27641 Exploits & PoCs (Proof Of Concept)

GitHub https://github.com/Max78000/CVE-2026-27641-Flask-Reuploaded
View Code
MODIFIED

Vulnerability data updated via NVD.

MODIFIED

Vulnerability data updated via NVD.

MODIFIED

Vulnerability data updated via NVD.

MODIFIED

Vulnerability data updated via NVD.

Attack Vector Matrix

Access Vector NETWORK
Complexity LOW
Privileges N/A
Interaction NONE
CVSS Vector String CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected Stack

No specific products linked.