---
id: CVE-2025-56218
title: >-
  An arbitrary file upload vulnerability in SigningHub v8.6.8 allows attackers
  to execute arbitrary code via uploading a crafted PDF file.
summary: >-
  An arbitrary file upload vulnerability in SigningHub v8.6.8 allows attackers
  to execute arbitrary code via uploading a crafted PDF file.
severity: critical
cvss: 9.8
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'
cwe:
  - CWE-434
vendor: ascertia
product: signinghub
affected:
  - signinghub <= 8.6.8
published: '2025-10-17'
updated: '2026-07-05'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2025-56218'
references:
  - url: 'https://github.com/saykino/CVE-2025-56218'
    label: cve@mitre.org
tags:
  - nvd
  - exploit-available
epss: 0.00632
epssPercentile: 0.48069
ingestedAt: '2026-07-06T16:44:34.298Z'
exploits:
  github: 1
  githubRepos:
    - 'https://github.com/saykino/CVE-2025-56218'
  checkedAt: '2026-09-26T09:05:34.074Z'
exploitAvailable: true
---

## Overview

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

## Affected

- `signinghub <= 8.6.8`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.