What is CVE-2025-56218?

CVE-2025-56218 is a critical-severity vulnerability in Ascertia Signinghub, classified under Unrestricted Upload of File with Dangerous Type. CVSS score: 9.8/10. Published 2025-10-17.

How severe is CVE-2025-56218?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Is CVE-2025-56218 known to be exploited?

2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Arbitrary file upload in Ascertia Signinghub

CVE-2025-56218

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

Vulnerability class: Unrestricted File Upload

Published 2025-10-17 · last modified 2026-07-05.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.006 (48.2th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 48th percentile — 48.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.006 · newest: 0.006 · change: +0.000

Affected products

Ascertia Signinghub

Weakness classification (CWE)

CWE-434 — Unrestricted Upload of File with Dangerous Type

Public proof-of-concept exploits

References

ascertia.com (Product)
signinghub.com (Product)
github.com/saykino/CVE-2025-56218 (Third Party Advisory)

Frequently asked questions

What is CVE-2025-56218?: CVE-2025-56218 is a critical-severity vulnerability in Ascertia Signinghub, classified under Unrestricted Upload of File with Dangerous Type. CVSS score: 9.8/10. Published 2025-10-17.
How severe is CVE-2025-56218?: Critical severity. CVSS v3 base score is 9.8 out of 10.
Is CVE-2025-56218 known to be exploited?: 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.