Is CVE-2026-27641 actively exploited?

No active exploitation of CVE-2026-27641 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-27641 be exploited remotely?

Yes. CVE-2026-27641 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-27641?

CVE-2026-27641 has a CVSS score of 9.8 (CRITICAL) and an EPSS exploitation probability of 0.15%.

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CRITICAL

CVE-2026-27641

CWE-1336Published: February 25, 2026· Updated: Feb 27, 2026

9.8

CVSS v3.1

EPSS:0.15%probability of exploitation in 30 daysPercentile:34.9th

Official 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.

NVD Source

Technical Analysis

CVE-2026-27641 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 9.8.