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Vulnerability record · CVE-2025-54321 · published 18 November 2025

CVE-2025-54321: Ascertia signinghub vulnerability

Ascertia · Signinghub

In 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 authenticated attacker can exploit this by automating reset password requests.

9.8 CVSS 3.1 Critical EPSS 0.47% · top 61.7% CWE-799 · CWE-799
9.8CVSS 3.1 base score
0.47%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
2References
17 Jun 2026Last modified by NVD

Description

In 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 authenticated attacker can exploit this by automating reset password requests.

CVSS:3.1/AV:N/AC:L/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-2025-54321 Third Party Advisory
https://www.ascertia.com/company/vulnerability-disclosure-policy/ Vendor Advisory

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Related vulnerabilities

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

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%8.1CVE-2025-56224Ascertia signinghub improper restriction of authentication attempts vulnerabilityA lack of rate limiting in the One-Time Password (OTP) verification endpoint of SigningHub v8.6.8 allows attackers to bypass verification via a brute…EPSS 0.39%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-2025-54321), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.