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Vulnerability record · CVE-2025-56224 · published 20 October 2025

CVE-2025-56224: Ascertia signinghub improper restriction of authentication attempts vulnerability

Ascertia · Signinghub

A lack of rate limiting in the One-Time Password (OTP) verification endpoint of SigningHub v8.6.8 allows attackers to bypass verification via a bruteforce attack.

8.1 CVSS 3.1 High EPSS 0.39% · top 69.6% CWE-307 · Improper restriction of authentication attempts
8.1CVSS 3.1 base score
0.39%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
1References
5 Jul 2026Last modified by NVD

Description

A lack of rate limiting in the One-Time Password (OTP) verification endpoint of SigningHub v8.6.8 allows attackers to bypass verification via a bruteforce attack.

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/saykino/CVE-2025-56224 Third Party Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.8CVE-2025-54321Ascertia signinghub vulnerabilityIn Ascertia SigningHub through 8.6.8, there is a lack of rate limiting on the reset password function, leading to an email bombing vulnerability. An …EPSS 0.47%9.8CVE-2025-56218Ascertia signinghub unrestricted file upload vulnerabilityAn arbitrary file upload vulnerability in SigningHub v8.6.8 allows attackers to execute arbitrary code via uploading a crafted PDF file.EPSS 0.63%9.8CVE-2025-56221Ascertia signinghub improper restriction of authentication attempts vulnerabilityA lack of rate limiting in the login mechanism of SigningHub v8.6.8 allows attackers to bypass authentication via a brute force attack.EPSS 0.60%7.5CVE-2025-56223Ascertia signinghub allocation without limits vulnerabilityA lack of rate limiting in the component /Home/UploadStreamDocument of SigningHub v8.6.8 allows attackers to cause a Denial of Service (DoS) via uplo…EPSS 0.46%7.1CVE-2025-56219Ascertia signinghub improper access control vulnerabilityIncorrect access control in SigningHub v8.6.8 allows attackers to arbitrarily add user accounts without any rate limiting. This can lead to a resourc…EPSS 0.32%6.1CVE-2025-61166Ascertia signinghub open redirect vulnerabilityAn open redirect in Ascertia SigningHub User v10.0 allows attackers to redirect users to a malicious site via a crafted URL.EPSS 0.18%4.3CVE-2025-54320Ascertia signinghub allocation without limits vulnerabilityIn Ascertia SigningHub through 8.6.8, there is a lack of rate limiting on the invite user function, leading to an email bombing vulnerability. An aut…EPSS 0.33%

Source: NIST National Vulnerability Database (record CVE-2025-56224), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.