CVE-2026-27635
Published: 26 February 2026
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 28.7th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog; a public proof-of-concept is referenced.
The strongest mitigations our analysis identified are NIST 800-53 SI-10 (Information Input Validation) and SI-2 (Flaw Remediation).
Deeper analysis
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.
OWASP Top 10 for Web (2025)
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2026-8766
Vulnerability details
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…
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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.
- CWE(s)
Related Threats
MITRE ATT&CK Enterprise TechniquesAI
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.
CVEs Like This One
Affected Assets
Mitigating Controls
Mitigating Controls (NIST 800-53 r5) AI
Directly prevents RCE from command injection by requiring validation and sanitization of untrusted ZIP filenames before passing to Ruby backtick execution.
Ensures timely flaw remediation by requiring patching to Manyfold version 0.133.0 or later, which sanitizes filenames to block shell metacharacters.
Mitigates exploitation by disabling non-essential model render generation functionality, reducing the attack surface for vulnerable versions.