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CVE-2025-56218

CriticalPublished

An arbitrary file upload vulnerability in SigningHub v8.6.8 allows attackers to execute arbitrary code via uploading a crafted PDF file.

Published: Oct 17, 2025
Updated: Jul 5, 2026
Assigning CNA: mitre
Evidence observed: Aug 25, 2026

Primary CVSS

9.8/ 10Critical

nvd · CVSS 3.1

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

EPSS probability estimate

0.6%

Low · next 30 days

Percentile: 48.6%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

Summary

An arbitrary file upload vulnerability in SigningHub v8.6.8 allows attackers to execute arbitrary code via uploading a crafted PDF file.

Sources

CVE-2025-56218Informational
Advisory detailing CVE-2025-56218, an unrestricted file upload vulnerability in Ascertia SigningHub allowing malicious Excel files with phishing links to be converted to PDF and distributed, with CVSS 5.5 and mitigation guidance.

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