CVE-2026-27635

HighPublic PoCRCE

Published: 26 February 2026

Published

26 February 2026

Modified

27 February 2026

KEV Added

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Patch

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CVSS Score 7.5 CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS Score 0.0007 22.1th percentile

Risk Priority 15 60% EPSS · 20% KEV · 20% CVSS

Summary

CVE-2026-27635 is a high-severity OS Command Injection (CWE-78) vulnerability in Manyfold Manyfold. Its CVSS base score is 7.5 (High).

Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked at the 22.1th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog; a public proof-of-concept is referenced.

Threat & Defense at a Glance

What attackers do: exploitation maps to Exploit Public-Facing Application (T1190) and 2 other techniques.

Threat & Defense Details

Likely Mitigating ControlsAI

Per-CVE control mapping for this CVE has not run yet; the list below is derived from the weakness types (CWEs) cited in the NVD entry.

SC-27 Platform-independent Applications

addresses: CWE-78

Platform-independent apps typically execute inside a managed runtime or sandbox that restricts direct OS command execution, reducing the ability to exploit OS command injection.

SI-10 Information Input Validation

addresses: CWE-78

Validates inputs to block special elements that would alter OS command execution.

MITRE ATT&CK Enterprise TechniquesAI

T1190 Exploit Public-Facing Application Initial Access

Adversaries may attempt to exploit a weakness in an Internet-facing host or system to initially access a network.

attack.mitre.org →

T1059.004 Unix Shell Execution

Adversaries may abuse Unix shell commands and scripts for execution.

attack.mitre.org →

T1068 Exploitation for Privilege Escalation Privilege Escalation

Adversaries may exploit software vulnerabilities in an attempt to elevate privileges.

attack.mitre.org →

Why these techniques?

RCE via OS command injection in public-facing web app directly enables T1190 for initial access, T1059.004 for Unix shell execution through backticks, and T1068 for priv esc from low-priv authenticated user to full server control.

Confidence: HIGH · MITRE ATT&CK Enterprise v18.1

NVD Description

Manyfold is an open source, self-hosted web application for managing a collection of 3d models, particularly focused on 3d printing. Prior to version 0.133.0, when model render generation is enabled, a logged-in user can achieve RCE by uploading a ZIP…

containing a file with a shell metacharacter in its name. The filename reaches a Ruby backtick call unsanitized. Version 0.133.0 fixes the issue.

Deeper analysisAI

CVE-2026-27635 is a remote code execution (RCE) vulnerability in Manyfold, an open-source, self-hosted web application for managing collections of 3D models, particularly for 3D printing. The issue affects versions prior to 0.133.0 when model render generation is enabled. It stems from CWE-78 (OS Command Injection), where a filename from an uploaded ZIP file is passed unsanitized to a Ruby backtick call, allowing shell metacharacters to execute arbitrary commands. The vulnerability has a CVSS v3.1 base score of 7.5 (AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H).

A logged-in user with low privileges (PR:L) can exploit this over the network (AV:N), though it requires high attack complexity (AC:H) due to the need for a specially crafted ZIP file containing a file with shell metacharacters in its name. Successful exploitation grants high-impact confidentiality, integrity, and availability effects (C:H/I:H/A:H) without user interaction (UI:N) or scope changes (S:U), enabling full RCE on the server hosting Manyfold.

The GitHub security advisory (GHSA-p589-cf26-v7h2) and release notes for version 0.133.0 detail the fix, recommending immediate upgrade to Manyfold 0.133.0 or later to sanitize filenames before they reach the Ruby backtick execution. Disabling model render generation provides a temporary mitigation for affected versions.