What is CVE-2025-56219?

CVE-2025-56219 is a high-severity vulnerability in Ascertia Signinghub, classified under Improper Access Control. CVSS score: 7.1/10. Published 2025-10-20.

How severe is CVE-2025-56219?

High severity. CVSS v3 base score is 7.1 out of 10.

Is CVE-2025-56219 known to be exploited?

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

Vulnerability in Ascertia Signinghub

CVE-2025-56219

Incorrect access control in SigningHub v8.6.8 allows attackers to arbitrarily add user accounts without any rate limiting. This can lead to a resource exhaustion and a Denial of Service (DoS) when an excessively large number of user accounts are created.

Published 2025-10-20 · last modified 2026-07-05.

CVSS v3 metric

CVSS v3 base score 7.1 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:H.

EPSS exploit prediction

EPSS: 0.003 (22.9th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 23rd percentile — 22.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: +0.000

Affected products

Ascertia Signinghub

Weakness classification (CWE)

CWE-284 — Improper Access Control

Public proof-of-concept exploits

References

ascertia.com (Product)
signinghub.com (Product)
github.com/saykino/CVE-2025-56219 (Third Party Advisory)

Frequently asked questions

What is CVE-2025-56219?: CVE-2025-56219 is a high-severity vulnerability in Ascertia Signinghub, classified under Improper Access Control. CVSS score: 7.1/10. Published 2025-10-20.
How severe is CVE-2025-56219?: High severity. CVSS v3 base score is 7.1 out of 10.
Is CVE-2025-56219 known to be exploited?: 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.